BGP Route Lookup
Look up an IP address or ASN in our collected BGP prefixes and origin ASNs
Usage
• Enter a public IPv4 or IPv6 address, or an ASN
• Shows the BGP routing prefix (CIDR) the IP belongs to
• Shows the origin AS number for each matching prefix
What BGP route lookup is for
This tool reads a current route snapshot from our own BGP collector. It returns the announced prefix covering a public IP and the origin ASN. An ASN query lists its observed prefixes. The result reflects only the collector's connected peers.
Use the result to check a prefix and its origin ASN, or compare observations after a network change. This tool does not currently expose the full AS path.
Frequently asked questions
How is BGP route lookup different from IP geolocation?
BGP lookup shows route snapshots from peers connected to our collectors; geolocation lookup shows database location labels. Collector observations do not represent the entire Internet.
Does this tool show the full AS_PATH?
The current tool shows announced prefixes and origin ASNs, not full AS_PATH data. An origin ASN helps check the observed announcement source, but does not establish the forwarding path or link quality.
How soon will a newly announced prefix be visible everywhere?
BGP visibility depends on propagation policy, peering and collector coverage, with no universal global completion deadline. No result here means there is no displayable matching snapshot in the current collection scope.
What does the prefix (CIDR) tell me?
A prefix identifies the address block covered by an observed route announcement. More-specific routes and routing policy can change the path used for individual addresses; an announcement does not guarantee reachability of every address.
References and result limitations
Online results reflect the queried source or probe state at that time. Record the target, time, nodes or data source, and parameters when citing them. A single result does not establish continuous availability everywhere.
These references explain protocol or format rules; they do not endorse results produced by this site.