Enter an IP or AS number — see the network owner, its announced IP ranges, and reverse-DNS samples from its address space.
BGP data is point-in-time. Nothing is stored.
An Autonomous System Number identifies a network operator on the internet — Google is AS15169, Cloudflare AS13335. Every public IP belongs to one, and each AS announces the IP ranges (prefixes) it routes via BGP.
Announced prefixes come from RIPEstat's live BGP data, organization details from PeeringDB, and registry metadata from Team Cymru. Reverse-DNS samples are resolved live at query time.
Large networks announce thousands of prefixes; resolving all of them would take minutes and hammer DNS infrastructure. The samples come from the largest ranges, which is usually enough to recognize the network's naming pattern.
Not necessarily. Many IPs simply have no reverse-DNS record, especially in large cloud ranges. It's only a problem for mail servers, where missing or mismatched PTR hurts deliverability — check those with the FCrDNS tool.
No — private, loopback and reserved addresses are refused. They have no public ASN.