Alphanumeric Sender ID Requirements


Use an Alphanumeric Sender ID to send text messages from your branded company name.

Countries supported

  • Alphanumeric Sender ID is not supported in the United States or Canada
  • Sender IDs cannot send messages to every country in the world.  Please see this list for restrictions: Alphanumeric Sender ID Support by Country.


Alphanumeric Sender IDs can be between 3 to 11 characters in length (most countries have a 6 character minimum) and support the following categories:

  • Upper-case letters A-Z
  • Lower-case letters a-z
  • Numbers 0-9

Your ID must include at least one letter and cannot be composed only of numbers. Non-ASCII special characters and punctuation, including spaces, are not allowed.

To help calculate the length of your sender ID, we recommend using the Sakari SMS length calculator:



Opt-In Requirements

Users must specifically opt in to receive your messages and know how to opt out before you send your first message.

Alphanumeric Sender IDs only support one-way communication.  As such, you must provide other opt-out instructions, such as contacting a Support team, calling a Support phone line, or texting another phone number or short code phone number to allow users to opt out.

You can also enable Universal Reply on your Alphanumeric Sender ID, which allows users to reply with an Opt Out Keyword like STOP.

Add a Sender ID to your account

Sender IDs can be added to your account directly in Sakari Hub: Buy a Number



Was this article helpful?
6 out of 9 found this helpful