The Leah Files

Check your identifiers

Paste domains or IP addresses, one per line or separated by commas. Matching happens in this page.

Defanged forms such as example[.]com work. Ports, paths and schemes are removed. Up to 5,000 entries. Advertising IDs are accepted but cannot be matched, see Sources & limits.

Where do I find these?
  • Router or firewall: the DNS query log or connection log, often exportable as text.
  • Pi-hole, AdGuard Home, NextDNS or similar: the query log lists every domain a device asked for.
  • Windows: ipconfig /displaydns lists cached names since the last restart.
  • Browser history is weaker evidence, since the ad infrastructure loads in the background.
  • Advertising ID: Android shows it under Settings, Privacy, Ads (path varies by version). iOS does not display it.