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title: Alphanumeric (Custom Word) Sender ID 
description: SMS Global Knowledgebase
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# Alphanumeric (Custom Word) Sender ID 

## What is an Alphanumeric (Custom Word) Sender ID?

An Alphanumeric Sender ID allows you to set a custom word, such as the name of your brand or business, as the Sender ID when sending one-way messages.

When using an Alphanumeric Sender ID (Custom Word), you must ensure that:

- Your Sender ID is no longer than 11 alphanumeric characters**\***
- Only (a-z) and (0-9) characters are used
- Any full stops or spaces are removed

***\**** *Some countries limit this character limit even further.*

​***Note:*** *Some carriers will reject Alphanumeric or Numeric Sender IDs. Please try changing to either a number or a text Sender ID to see if the problem is resolved.*

*This feature is only available in [supported countries](https://hs.smsglobal.com/global-sender-id-support-smsglobal-help-center?hsLang=en-au) and does not enable replies from recipients for [two-way communication](https://hs.smsglobal.com/sender-id-from-address-for-two-way-communication-smsglobal-help-center?hsLang=en-au).*

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