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Which domains do I need to register?

Where to add your domains, how subdomains are handled, and why an unregistered host is the top reason a new install shows no data.

Getting started1 min readLast updated Oct 28, 2026TapCub teamPart of Add a website, app or mini-program

Short answer

Register every hostname your visitors use — example.com, www.example.com, shop.example.com — on the SDK code page. Subdomains of a registered domain are accepted. Hits from an unregistered host are dropped silently.

Add every hostname

For a website, open Web analyticsConfigurationSDK code and add every domain visitors use, without https:// or a path:

  1. List each hostname. example.com, www.example.com and any subdomain such as shop.example.com.
  2. Subdomains come free. A registered domain also accepts its subdomains, so you do not need to list every one.
  3. Add localhost only to test. Register localhost while testing locally and remove it afterwards.

Why an unregistered host shows no data

Hits from a host that is not on the list are dropped silently — the collector still answers 202, but nothing is stored. This is the single most common reason a fresh install shows no data. If Realtime stays empty after install, check this list first, then work through why TapCub shows no data.

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