138 added
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Original
2026-01-01
Modified
2026-03-10
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<p>Ever signed up for a brand’s texts or SMS marketing updates?</p>
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<p>In the US, Canada, and New Zealand, short codes are a great way to send mass SMS marketing campaigns that come from a short, memorable phone number.</p>
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<p>Then you’ve probably noticed messages are coming from a number that doesn’t look like the others.</p>
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<p>They deliver SMS messages fast, too. Where it might take other number types up to 50 minutes to deliver a campaign, a short code can typically<a>do it in 5 minutes</a>.</p>
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<p>These abbreviated numbers are called “short codes” or “common codes,” and they serve a unique purpose in<a>SMS marketing</a>.</p>
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<p>Here, you’ll learn what SMS short codes are, how to perform an SMS short code lookup, and how to register codes for compliant, high-deliverability SMS marketing.</p>
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<p>Short codes are a great way for a business to send targeted and personalized text messages to a lot of subscribers. This helps marketers scale up on their owned channel strategies with SMS marketing automations that make execution a lot easier.</p>
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<h2>What are SMS short codes and how do they work?</h2>
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<p>But first, you need to understand the difference between a dedicated short code, vanity code, 10DLC number, toll-free number…oh my. Each comes with different send rates, pricing, approval time, and more.</p>
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<p>An SMS short code is a 5- or 6-digit phone number that businesses use instead of a 10-digit number for SMS marketing campaigns.</p>
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<p>Want more on SMS marketing? We’ve got you covered, with articles that dive deep into:</p>
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<p>Short codes are great for high-volume, mass SMS messaging in the US, Canada, and New Zealand for two key reasons:</p>
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<ul><li><a>What is SMS marketing?</a></li>
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<li>The<a>top 10 SMS integrations</a></li>
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<li><a>SMS marketing best practices</a>from the experts</li>
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<li>The crawl, walk, run approach to<a>building an SMS marketing strategy</a></li>
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<li>16<a>high-impact SMS plays</a>for boosting ROI</li>
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</ul><h2>What is an SMS short code?</h2>
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<p>An SMS short code is a 5- or 6-digit phone number that businesses use instead of a 10-digit number for SMS marketing campaigns. These short codes are great for high-volume, mass text messaging for two key reasons:</p>
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<ol><li>They have a fast per-second send rate.</li>
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<ol><li>They have a fast per-second send rate.</li>
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<li>Due to the strict approval process and opt-in, they are filtered less by carriers.</li>
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<li>Due to strict approval processes and opt-in, they’re filtered less by carriers and have high deliverability rates.</li>
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</ol><p>Short code numbers are easily recognizable because they’re shorter than regular cell phone numbers. You also have the option of leasing a vanity code, which allows you to choose your own number-one that’s relevant for your brand or a campaign (more on this next).</p>
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</ol><p>Short code numbers are easily recognizable because they’re shorter than regular cell phone numbers. Brands can also lease a vanity code, which is a custom short code that better represents the brand or campaign.</p>
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<p>Note that brands used to be able to get less expensive shared short codes, which allowed multiple businesses to use the same SMS short code. These, however, were phased out by major US wireless carriers in 2021.</p>
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<p>The US Short Code Directory and Common Short Code Administration (CSCA) can randomly assign you a short code for a lower cost. If you use Klaviyo for SMS marketing,<a>we can also help</a>.</p>
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<h2>What are my options if I don’t want a standard SMS short code?</h2>
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<h3>Dedicated vs. shared short codes</h3>
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<p>Beyond a standard short code, your options include:</p>
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<p>Dedicated short codes are used exclusively by one brand. They give businesses full control over their messaging, keywords, and customer experience. Because no other sender shares the number, dedicated short codes are ideal for large-scale SMS marketing programs.</p>
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<h3>1. A vanity code</h3>
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<p>Shared short codes-where multiple brands used the same number-were<a>phased out by major US carriers</a>starting in 2021 due to compliance risks.</p>
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<p>A vanity code is a 5- to 6-digit SMS short code you choose. For example, if you’re a jewelry company, you may want something like 74463 to spell out “SHINE.”</p>
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<h3>Vanity vs. random short codes</h3>
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<h3>2. 10DLC number</h3>
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<p>Vanity short codes, also called select short codes, spell out memorable key words with specific digits (for example, “73223” to spell “PEACE”). Vanity codes cost more but are easier to remember and more recognizable to your subscribers.</p>
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<p>A 10DLC number, or 10-digit long code, is more affordable than a short code. But it’s slower to send and has a higher risk of carrier filtering, because carriers haven’t vetted it like they do with a short code. Some brands purchase more than one 10DLC number to make up for the slower send rate.</p>
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<p><strong>Important note:</strong>With Klaviyo, vanity short codes are available in the US, and they’re your only option if you want to use a short code in Canada and New Zealand. (Vanity short codes are also available in the UK, but they are much less popular there.) Random short codes are only available in the US.</p>
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<p><strong>Important note:</strong>Klaviyo no longer offers 10DLC in the US or Canada. In those countries, we only offer short codes and toll-free numbers (more on those next). In the UK, Australia, and Ireland, we support country-specific long codes.</p>
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<h2>What are my options if I don’t want an SMS short code?</h2>
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<h3>3. Toll-free number</h3>
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<p>If you want to start sending text messages to subscribers but you don’t want a short code, your options include:</p>
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<p>Compared with 10DLC numbers, 10-digit toll-free numbers have higher throughput. This may be the best option if you’re growing your SMS marketing program and aren’t quite ready to commit to a short code.</p>
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<h3>1. Branded sender IDs</h3>
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<strong>SMS short code</strong><strong>10DLC</strong><strong>Toll-free</strong><strong>Length</strong>5-6 digits10 digits10 digits<strong>Number of SMS subscribers</strong>Recommended for 15K-30K; strongly recommended for 30K-50K<15K<15K<strong>Approval time</strong>Several weeks3-7 business days3-7 business days<strong>Message filtering</strong>MinimalModerateModerate<h2>Why short codes = peak SMS marketing performance</h2>
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<p>With<a>branded sender IDs</a>, also called alphanumeric sender IDs, your brand’s name is displayed as the sender ID or number when you send one-way SMS messages. Brands aren’t able to use this message type for two-way SMS, keywords, or double opt-in.</p>
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<p>If you’re just testing the waters with your SMS marketing efforts, a toll-free number is a fine option. However, as your subscriber list grows or you want to send images and GIFs (MMS) to a wider audience, short codes offer some clear benefits:</p>
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<p>While the same branded sender ID may be used across countries, the US and Canada don’t support them. If you want to send SMS messages in those markets, opt for toll-free numbers or short codes.</p>
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<p>Short codes are brief and memorable.</p>
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<h3>2. Toll-free number</h3>
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<p>If you’re also advertising with print, radio, etc., vanity short codes are an especially good option. And you can easily create different keywords to know which marketing channels are working and which aren’t (more on this later).</p>
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<p><a>Toll-free numbers</a>are a cost-effective option for brands in the US and Canada that are exploring SMS. Common use cases for this option include:</p>
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<p>Short codes are unmistakably business numbers.</p>
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<ul><li>Customer service and support messages for inquiries, feedback, and assistance</li>
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<p>When someone sees a message from a short code on their cell phone, they know it’s coming from a business or organization, not someone they know.</p>
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<li>Transactional messages such as purchase confirmations, shipping notices, and delivery notifications</li>
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<p>SMS short codes are credible.</p>
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<li>Marketing campaigns like promo codes, new product announcements, and limited-time offers</li>
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<p>People can look up your SMS short code in a<a>directory</a>, which gives your text campaigns more legitimacy.</p>
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<li>Surveys, polls, and feedback requests to gather valuable customer data</li>
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<p>Short codes for reliable high-volume sends</p>
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</ul><p>Unlike 10DLC (more on these next), toll-free numbers use an 8XX prefix, such as 800, 833, 844, 855, 866, 877, and 888. They may be a good choice if you need reliable application-to-person (A2P) messaging but aren’t ready for the higher cost and commitment of a short code.</p>
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<p>Short codes are designed for large-scale sends, offering greater reliability and speed compared to toll-free numbers (TFNs). Because they’re pre-vetted, short codes are less likely to face carrier filtering or blocks, ensuring your messages reach more customers. They also handle high-volume MMS (images and GIFs) better, making them ideal for media-rich campaigns. For flash sales or time-sensitive promotions, short codes provide the speed and dependability needed to maximize impact.</p>
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<h3>3. 10DLC number (US only) or long code (all other regions)</h3>
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<p>Short codes are for SMS, nothing else.</p>
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<p>In the US only, a 10-digit long code, or 10DLC number, is more affordable than a short code. It can be activated with a local area code so that communications appear more authentic based on a company’s location.</p>
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<p>Short codes can only send or receive text messages. You can’t use them for phone calls or faxes, so you don’t have to worry about recipients trying to use it outside the purpose of SMS.</p>
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<p>But a 10DLC number is slower to send and has a higher risk of carrier filtering compared to short codes. And as of February 2025, all 10DLC numbers require registration through<a>The Campaign Registry</a>, where both the brand and each messaging campaign must be vetted and approved by carriers before messages can be sent.</p>
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<p>These requirements help reduce carrier filtering, but filtering is still possible for businesses that don’t closely adhere to guidelines. And 10DLC messages are still<a>subject to throughput limits</a>based on the sender’s trust score. To compensate for slower send rates, some brands purchase multiple 10DLC numbers.</p>
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<p>Outside of the US, long codes mimic the format of local mobile numbers where they are activated. Area code recognition is not available with international long codes, but activation is much simpler, and throughput is not constrained by a brand’s reputation but rather determined by aggregators.</p>
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<p><strong>Important note:</strong>Klaviyo<a>does not support 10DLC</a>in the US, or long codes in the US, Canada, France, or New Zealand. In the UK, Australia, Ireland, and several other regions throughout Europe, we support country-specific domestic Long Codes.</p>
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<h2>Business SMS phone number options</h2>
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<p><strong>Characteristic</strong></p>
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<p><strong>SMS short code</strong></p>
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<p><strong>10DLC</strong></p>
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<p><strong>Long code</strong></p>
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<p><strong>Toll-free number</strong></p>
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<p><strong>Branded sender ID</strong></p>
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<p><strong>Length</strong></p>
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<p>5-6 digits</p>
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<p>10 digits</p>
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<p>10 digits</p>
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<p>10 digits</p>
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<p>4-11 characters</p>
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<p><strong>Number of SMS subscribers</strong></p>
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<p>Recommended for 15K-30K; strongly recommended for 30K-50K</p>
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<p><15K</p>
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<p>Any</p>
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<p><15K</p>
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<p>Any</p>
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<p><strong>Approval time</strong></p>
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<p>Several weeks</p>
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<p>Varies by use case</p>
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<p>Varies by use case</p>
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<p>2-5 business days</p>
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<p>Instant in regions where they’re the default</p>
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<p><strong>Message filtering</strong></p>
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<p>Minimal</p>
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<p>Moderate</p>
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<p>Minimal</p>
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<p>Moderate</p>
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<p>Minimal</p>
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<p><strong>Ideal for</strong></p>
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<p>High-volume, branded sends</p>
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<p>Two-way communication, customer support, transactional messages, customer feedback on marketing</p>
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<p>Two-way communication, customer support, transactional messages, customer feedback on marketing</p>
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<p>Two-way communication, customer support, transactional messages, customer feedback on marketing</p>
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<p>One-way communication where brand recognition is important, like event invites</p>
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<p><strong>Regional availability with Klaviyo</strong></p>
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<p>US, Canada, UK, New Zealand</p>
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<p>Not available</p>
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<p>UK, Ireland, Belgium, Netherlands, Germany, Austria, Spain, Switzerland, Denmark, Sweden, Norway, Finland, Italy, Portugal, Poland, Hungary, Australia</p>
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<p>US, Canada</p>
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<p>UK, Ireland, France, Netherlands, Germany, Austria, Spain, Switzerland, Denmark, Sweden, Norway, Finland, Italy, Portugal, Poland, Australia</p>
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<h2>How to look up SMS short codes for free</h2>
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<p>Before you launch your SMS marketing program, you’ll want to verify that a short code is available.</p>
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<p>Here’s some information on how to look up SMS short codes for free in the US, Canada, and the UK. Note that you’ll need to check availability for every country where you want to use short codes.</p>
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<h3>United States free SMS short code lookup</h3>
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<p>The<a>US Short Code Registry</a>is a trustworthy directory maintained by the Cellular Telecommunications Industry Association (CTIA). It’s the official resource for checking whether a short code is available to lease.</p>
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<p>Here’s how to use it to conduct short code lookups for free:</p>
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<ol><li>Visit<a>usshortcodes.com</a>.</li>
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<li>Click “Find a Short Code.”</li>
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<li>Search for your desired 5-6 digit number.</li>
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<li>View the status of the short code. If it’s available, you can add the number to an online cart. If it’s unavailable, you’ll be presented with similar short codes to choose from instead.</li>
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</ol><p>Canada free SMS short code lookup</p>
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<p>For<a>Canadian short codes</a>, the<a>Canadian Telecommunications Association</a>maintains a registry of current short code programs. You can search for available short codes in the registry. You’ll also be able to see active short codes, company name, short code number, and URL.</p>
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<p>United Kingdom free SMS short code lookup</p>
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<p>The official reservation and allocation system for<a>UK short codes</a>is managed by the<a>Shortcode Management Group</a>(SCMG). This is where you can browse available short codes and view registered service providers.</p>
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<h2>Short code pricing and fees</h2>
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<p>SMS short code pricing varies depending on whether you choose a dedicated or vanity short code, as well as your messaging volume and the<a>SMS marketing provider</a>you select.</p>
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<p><strong>Cost type</strong></p>
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<p><strong>Price range</strong></p>
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<p><strong>Payment frequency</strong></p>
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<p>Dedicated (random) short code</p>
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<p>~$500</p>
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<p>Monthly</p>
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<p>Vanity short code</p>
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<p>~$1,000-$1,150</p>
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<p>Monthly</p>
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<p>When considering costs, remember that for brands sending high-volume SMS campaigns, SMS short codes can deliver better results thanks to their carrier pre-approval per the Short Code Registry. Here’s what that investment gets you:</p>
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<ul><li><strong>High throughput:</strong>Quickly send hundreds of messages so your time-sensitive campaigns reach customers when they matter.</li>
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<li><strong>Lower filtering:</strong>Carrier pre-approval and strict vetting mean your messages land in inboxes instead of getting blocked as spam.</li>
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<li><strong>Better brand recognition:</strong>Customers are more likely to trust messages from consistent, recognizable numbers, especially for order updates and promotional campaigns.</li>
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</ul><h2>Why short code compliance matters</h2>
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<p>When it comes to SMS marketing, compliance isn’t just a box brands are required to check. It’s a foundation for trust and<a>SMS deliverability</a>.</p>
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<p>When you properly register a short code, the CTIA will<a>conduct audits</a>to ensure compliance. As soon as you begin running a SMS marketing program, take care to:</p>
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<ol><li>Get<a>explicit permission</a>to send promotional material to subscribers, with clear calls to action that communicate what people are signing up for.</li>
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<li>Use double opt-in to confirm a subscriber’s consent to send messages to them.</li>
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<li>Include your brand’s name at the beginning of every message to make it clear to subscribers who they’re hearing from.</li>
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<li>Provide a clear opt-out mechanism and honor requests immediately.</li>
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<li>Comply with<a>time of day restrictions</a>. Avoid sending messages anytime before 8:00 a.m. and after 9:00 p.m. in the recipient’s time zone.</li>
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</ol><p>If you fail these compliance checks, you risk being filtered, blocked, or fined-and your deliverability can tank.</p>
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<h2>4 SMS short code best practices</h2>
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<h2>4 SMS short code best practices</h2>
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<p>Short codes are about providing an excellent customer experience. Here are 4 SMS short code best practices for achieving that:</p>
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<p>Short codes help provide an excellent customer experience. Here are 4 SMS short code best practices for achieving that:</p>
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<h3>1. Understand local SMS compliance laws</h3>
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<h3>1. Understand local SMS compliance laws</h3>
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<p>It’s important for your<a>SMS campaigns to be in compliance</a>with the local laws where you do business. Make sure your business complies with the Telephone Consumer Protection Act (TCPA), Cellular Telecommunications Industry Association (CTIA), and other messaging authorities.</p>
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<p>It’s important for your<a>SMS campaigns to be compliant</a>with the local laws where you do business. Make sure your business complies with the Telephone Consumer Protection Act (TCPA), Cellular Telecommunications Industry Association (CTIA), and other messaging authorities.</p>
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<p>Whether you send from a short code or a long number, always respect your customers’ privacy and honor their opt-in and opt-out requests. Never spam or send unwanted messages.</p>
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<p>Whether you send from a short code or a long number, always respect your customers’ privacy and honor their opt-in and opt-out requests. Never spam or send unwanted messages.</p>
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<h3>2. Use vanity short codes for memorable brand messages on other channels</h3>
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<h3>2. Use vanity short codes for memorable brand messages on other channels</h3>
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<p>Vanity short codes can be a great way to create a memorable number that your customers can text to opt in to campaigns, contests, discounts, and much more.</p>
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<p>Vanity short codes can be a great way to create a memorable number that your customers can text to opt in to campaigns, contests, discounts, and much more.</p>
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<p>This versatility is often worth the extra cost. Because they’re typically easier to remember than a string of numbers, vanity codes can be used in print campaigns, billboards, digital campaigns, radios, podcasts, and other marketing channels. This can help you create unique customer experiences through SMS.</p>
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<p>This versatility is often worth the extra cost. Because vanity codes are typically easier to remember than a string of numbers, you can use them in<a>omnichannel campaigns</a>across print, billboards, digital messaging, radio ads, podcasts, and more. This can help you create unique customer experiences through text messaging.</p>
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<h3>3. Make it obvious SMS messages are from your brand</h3>
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<h3>3. Use RCS to improve brand recognition</h3>
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<p>Mention your brand name in your messages, whether you’re sending from a long or short number. Most people don’t save businesses to their contact list. When you send<a>branded text messages</a>, customers never have to guess where they’re coming from.</p>
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<p>If you’re using<a>Rich Communication Services</a>(RCS) in your text message marketing, you can take brand recognition further with a verified business profile that automatically displays your logo and a verification badge. This can make your brand instantly recognizable and protect customers from phishing attempts.</p>
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<h3>4. Use keywords in your short code texts</h3>
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<h3>4. Use keywords in your short code texts</h3>
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<p>Tracking return on investment (ROI) is vital to the success of any marketing campaign. To attribute revenue back to<a>your SMS campaigns</a>and flows,<a>use custom keywords</a>to track where your subscribers are coming from.</p>
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<p>Tracking return on investment is key to the success of any marketing campaign. To attribute revenue back to your<a>SMS marketing campaigns</a>and flows, use custom keywords to track where your subscribers are coming from.</p>
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<p>For example, you may say:</p>
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<p>For example, you might say:</p>
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<ul><li>“Text FB to 34267 to get an exclusive offer” on Facebook</li>
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<ul><li>“Text IG to 34267 to get an exclusive offer” on Instagram.</li>
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<li>“Text ENTER to 34267 to enter our giveaway” if you’re trying to grow your SMS list through a contest or giveaway</li>
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<li>“Text ENTER to 34267 to enter our giveaway” if you’re trying to grow your list with a contest or giveaway.</li>
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</ul><p>Mira increases email and SMS revenue by 252% in 6 months</p>
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</ul><h2>How to get a short code with Klaviyo</h2>
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<p>Curious about how other brands are using SMS marketing? Learn why healthtech brand Mira switched from Attentive to Klaviyo SMS.</p>
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<p>When you’re ready to<a>apply for a short code</a>as a Klaviyo customer, follow these steps:</p>
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<h2>Next steps: How to get a short code or toll-free number</h2>
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<ol><li>Navigate to Settings > SMS > Add country, then select the option to apply for a short code.</li>
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<p>If you’re using<a>Klaviyo for SMS marketing</a>, the first step is to fill out the<a>short code application form</a>.</p>
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<li>Fill out the short code request form. If you want multiple short codes, fill out the form multiple times.</li>
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<p>You will need to determine if you want a random or vanity short code. For vanity short codes, see what’s available by checking the<a>US Short Code Registry</a>, which is overseen by the<a>CTIA</a>, the wireless trade association.</p>
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<li>A Klaviyo expert will review your application within a few business days.</li>
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<p>Be sure to prepare examples of text messages you plan to send for review by the mobile carriers, as well as general business information, including:</p>
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<li>If anything is missing or needs to be updated, you’ll receive an email from a Klaviyo specialist.</li>
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<ul><li>Business name</li>
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<li>Once the application is complete, Klaviyo creates mockups of your sign-up forms in your account.</li>
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<li>Business address</li>
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<li>Klaviyo submits the application for approval to carriers and emails you to let you know when they either approve or deny it.</li>
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<li>Primary contact’s name, email, and phone number</li>
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</ol><p><a>Klaviyo SMS</a>helps you reach, convert, and retain customers with personalized, timely conversations-all powered by AI and unified customer data. With Klaviyo, you can:</p>
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<li>Support phone number and/or email address</li>
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<ul><li>Personalize messages with a built-in data platform and two-way conversations.</li>
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</ul><p>Provisioning a new short code can take several weeks. For more detail on<a>securing an SMS short code</a>, visit our help center.</p>
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<li>Reach shoppers around the world with SMS, RCS, WhatsApp, email, and mobile marketing all in one platform.</li>
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<p>To get a verified toll-free number,<a>sign up for Klaviyo SMS</a>and get one for free.</p>
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<li>Use automated testing and list growth tools to drive more text message revenue, faster.</li>
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<h3>How do I find out who owns a short code?</h3>
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<li>Make decisions based on ROI with multi-channel attribution and reporting.</li>
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<p>You can look up an SMS short code owner in the<a>US short code directory</a>. Click on the search icon and enter the short code to look up who owns it.</p>
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</ul><p>Connect with customers via personalized text messaging with Klaviyo</p>
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<h3>How do I get a short code for SMS?</h3>
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<p><a>Sign up</a></p>
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<p>You can get an SMS short code by applying with the<a>US Short Code Registry</a>, but if you use Klaviyo for SMS marketing,<a>we’ll help you</a>.</p>
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<h3>What is a short code lookup service or short code registry?</h3>
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<p>A short code lookup service is a short code registry or SMS registry you can access online to find out who is sending you text messages. Because Klaviyo provisions short codes for our customers, the only reason you would need to do a short code lookup is to check if the number you want is available before application.</p>
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<h3>What is the difference between an SMS long code vs. short code?</h3>
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<p>First, short codes deliver messages much faster. Second, since short codes require pre-approval, carriers trust messages from short codes more than other number types and are less likely to filter your texts. Finally, short codes build trust with your audience because consumers tend to associate short codes with vetted brands.</p>
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<h3>How much does an SMS short code cost?</h3>
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<p>It depends on the type of short code and your SMS marketing platform.<a>With Klaviyo</a>, for example, a vanity short code costs $1,150/month in the US and $1,000/month in Canada, while a random short code costs $500/month.</p>
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<h3>Do SMS short codes work in other countries?</h3>
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<p>No, SMS short codes do not work in other countries. You’ll need to apply for separate short codes in separate countries. For example, your US short code will not work in Canada. You’ll need to apply for a separate Canadian short code.</p>
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<h3>How do users opt in or out of SMS?</h3>
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<p>Users<a>opt in to SMS</a>by giving explicit permission through sign-up forms or links. With double opt-in, the subscriber receives a message that asks them to confirm their consent with a keyword (for example, “Reply YES to confirm your subscription”). To opt out, users can text a keyword (usually “STOP”) to unsubscribe-something that, by law, the brand must make clear in each text message.</p>
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