[ Autonomous System Number | Network Owner | BGP Routing Info ]
Enter IP address or ASN (AS number)
What is ASN?
Autonomous System Number identifies networks on the internet.
Examples:
AS15169 = Google
AS13335 = Cloudflare
AS16509 = Amazon
Use cases:
Network analysis, ISP identification, routing diagnostics
What is an ASN? An Autonomous System Number (ASN) uniquely identifies a network on the internet. Each ISP, cloud provider, or large organization has one or more ASNs to control their IP address blocks and routing policies.
Why it matters: ASNs help with network troubleshooting, identifying service providers, understanding BGP routing, security analysis, and tracing network ownership.
Common ASNs: Google (AS15169), Cloudflare (AS13335), Amazon AWS (AS16509), Microsoft Azure (AS8075), Comcast (AS7922).
Related: IP Lookup · WHOIS · Traceroute
What is an ASN? An ASN (Autonomous System Number) is a unique ID for a network that announces IP routes via BGP (Border Gateway Protocol).
Can I lookup an ASN from an IP? Yes. Many IP intelligence providers map IPs to the organization and ASN that owns/announces the route.
Does ASN tell me who exactly is using the IP? Not reliably. It identifies the network owner/route announcer, not a specific person. VPNs/proxies can also change what you see.
What should I use ASN lookup for? Troubleshooting routing/latency, identifying datacenter traffic, and security investigations. Pair it with IP Lookup and WHOIS for more context.