What is SubnetHistory

One search that answers who holds an IP, prefix or AS number, who held it before, and what its addresses have been doing lately.

subnethistory.com reads the past of an address, prefix or AS in one search, each fact naming its source.

What a report contains

• Registration. Holder, country, contacts, raw whois.
• Routing. Announcement, origin AS, RPKI validity.
• Ownership history. Past origins and transfers.
• Network profile. Announced space, transit, IX, PeeringDB.
• Address intelligence. Sampled VPN, proxy, Tor, datacentre and abuse verdicts.
• Active proxy checks. Confirmations from our own checks.
• Tags. Residential proxy, bulletproof hosting and similar labels.

An empty field reads n/a, which is not zero and not a finding of clean.

Who it is for

Fraud and abuse teams, address space buyers, network operators and researchers.

Free, with an open API

Website lookups are free and the API needs no key. The API overview has limits and error shapes.