> For the complete documentation index, see [llms.txt](https://helps.ptengine.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://helps.ptengine.com/en/faq/tracking-code/subdomain-tracking.md).

# Subdomain Tracking

Ptengine allows you to set up multiple domains within a single profile. Additionally, multiple subdomains can be configured for a single domain.

* Regardless of how many subdomains a domain has, they are all considered a single domain.

For example:

[www.\`sample.co.jp\`](http://www.`sample.co.jp`)

store.`sample.co.jp`

sale.`sample.co.jp`

These three different subdomains actually belong to the same domain, `sample.co.jp`. You only need to set it up as one domain, and all three sites will be tracked.