BGP ASN Lookup
Look up an Autonomous System Number or an IP and see the holder, country, announced IPv4/IPv6 prefixes, and BGP peer neighbors. Live data from the RIPEstat API.
About BGP & ASNs
The public internet is a network of autonomous systems — independent networks operated by ISPs, hosting providers, universities, and large enterprises. Each AS is identified by a globally unique ASN assigned by a Regional Internet Registry (ARIN, RIPE, APNIC, LACNIC, or AFRINIC). They exchange reachability information using BGP (Border Gateway Protocol), the routing protocol that holds the internet together.
This tool queries the RIPEstat Data API, which aggregates the global BGP table from RIS (Routing Information Service) collectors plus WHOIS data from the five RIRs. You can look up either:
- An ASN — see the holder, country, prefixes it announces, and which other ASNs it peers with.
- An IP address — see which ASN announces it and which prefix covers it.
Common Use Cases
- Incident response: identify which network owns an attacking or scanning IP
- Peering decisions: see who a target network peers with
- Hijack detection: compare current announcers of a prefix vs the legitimate holder
- Network reconnaissance: map an organization's announced address space
- Sales / BD: understand a prospect's network footprint