Who runs this site?
Type a news site. We find other sites that publish the same rare account numbers in their own public files.
Or try one
How often it is right
We tested it once on site pairs it had never seen, with every rule fixed in advance.
The test results could not be loaded, so we make no accuracy claim here.
Full results and method
What counts as a connection
A link requires two independent rare technical families and a combined rarity score of at least 12. An ads.txt OWNERDOMAIN declaration is one family. Analytics IDs and DIRECT seller accounts together form a second. A shared TLS certificate is a third.
A lone qualifying family is a lead. Values shared by more than two registrable domains or ten hosts are ignored and shown with their index counts. Nameservers, IP addresses, shared hosting, themes, page text, favicons and asset hosts are context only.
One registrable domain with many subdomains is one site, never a cross-domain discovery. Public publisher brand lists and network reports supply evaluation labels only and never enter matching.
Addresses outside the index get a public-only read capped at five seconds. Robots refusals, missing pages and incomplete captures stay visible. The comparison covers this index, not the whole web. A technical link suggests investigation and does not prove ownership or intent.