# Your brand name in the from field.

An alphanumeric sender ID puts your brand name in the message's "from" field instead of a number. It's one-way: recipients see the name but can't reply. Many countries support it, and many require you to pre-register the sender string before it will deliver.

## When a name beats a number.

An alphanumeric sender ID is one of the four sender types on Bird SMS numbers, part of the broader Bird SMS API. Reach for it when recipients should see your brand rather than a phone number and you don't need them to reply — notifications, OTP, and one-off alerts where the message is the whole conversation.

## What an alphanumeric sender gives you.

Brand in the from field, with real constraints.

## Set the sender per send.

Where the destination permits it, you set the sender string on the send itself — pass your brand in the from field instead of a number. The send shape is the same one you use for every sender type; only the from value changes.

## Country rules decide what delivers.

Whether an alphanumeric sender works — and whether it has to be registered first — is set by each destination country and its carriers. Bird handles sender ID registration per country so the string you send is the string recipients see. When you need recipients to reply, use a long code, short code, or toll-free number instead.

## Send from your brand where it lands.

An alphanumeric sender ID is one sender type on the Bird SMS numbers surface. Register the string per country, set it on the send, and reach recipients with a name they trust.