---
title: Custom tracking domains
description: Why to put tracking links on your own domain, and what to add to DNS.
updated: 2026-07-30
order: 5
related: [/guides/first-campaign, /concepts/vocabulary]
---

A tracking domain is the hostname in your tracking links. By default PostbackX gives
you a shared one; pointing your own at it produces links like
`track.yourdomain.com` instead.

## Why bother

**The link looks like yours.** A visitor hovering a link sees your brand rather than
an unfamiliar host, and so does the ad reviewer.

**You are not sharing reputation.** A shared domain's standing is affected by
everyone using it. Your own domain answers only for your traffic.

**You can move it.** A domain you control can be repointed. One you do not, cannot.

## Set one up

[Domains](https://app.postbackx.com/domains) walks through it, with an animated
demonstration for the common DNS providers — the wizard shows the actual screens for
your registrar rather than describing them generically.

The shape is always the same: add a subdomain you will use for tracking, create the
DNS record PostbackX gives you, then wait for verification.

DNS propagation is typically minutes and occasionally hours. The page shows
verification state, so you do not have to guess.

## Then use it

Set the new domain as default and new campaigns pick it up.

> Existing campaigns keep the domain they were created with, and their live links
> keep working. Changing the default does not rewrite links already behind running
> ads — which is deliberate, since rewriting them would break every ad pointing at
> the old host.

To move an existing campaign, update it and replace the link in the ad.

## A note on the default domain

The shared default works, and is fine while you are setting things up or testing.
It is not what you want behind meaningful spend, for the reasons above.