# Sender IDs

Sending under your organisation's name, registering it with ComReg in Ireland, and when to use a reply number instead.

A sender ID is the name your message appears to come from. These pages explain how sender IDs work, how to register one with ComReg in Ireland, and when a reply number is the better choice.

## Pages in this section

- [About sender IDs](https://iflow.net/docs/sender-ids/about-sender-ids/): What a sender ID is, the rules for choosing one, how it is approved, and when to use a reply number instead.
- [Register with ComReg](https://iflow.net/docs/sender-ids/register-with-comreg/): How to register your SMS sender ID with ComReg in Ireland so it can be used with Iflow, step by step.

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Source: https://iflow.net/docs/sender-ids/