ASN Lookup

Map any IPv4 or IPv6 address to the Autonomous System that announces it: AS number, owning organisation, BGP prefix, country and registry. Uses Team Cymru's IP-to-ASN service over DNS-over-HTTPS.

Queries run over Cloudflare's public DNS-over-HTTPS resolver (1.1.1.1) against Team Cymru's IP-to-ASN DNS service. Nothing is sent to UniCybers servers and no lookups are stored. Data reflects current BGP routing as seen by Team Cymru and depends on their service being reachable. Private, reserved or unannounced IPs return no result.