ASN Lookup API
Look up Autonomous System Numbers (ASNs) — the identifiers that label every network on the public internet — mapped to their owning organisation and country. 122,000+ ASNs derived from the Regional Internet Registries (ARIN, RIPE, APNIC, LACNIC, AFRINIC). Resolve an ASN to its operator (e.g. AS15169 → Google LLC, US; AS13335 → Cloudflare; AS16509 → Amazon), or search by organisation name and country (e.g. "hetzner" in DE). Ideal for network intelligence, abuse/security investigation, traffic analysis, IP-reputation tooling and BGP/peering research.
api.oanor.com/asn-api
