// Tool
BGP Route Lookup
Look up BGP routing info for any IP address, prefix, or ASN. Data sourced from RIPE Stat.
Accepts: IP address · CIDR prefix (1.1.1.0/24) · ASN (AS13335 or 13335)
Frequently Asked Questions
What is an origin AS?
The autonomous system that first announces a prefix into BGP. It is the rightmost AS in the AS path and is considered authoritative for routing that prefix.
What do RPKI "valid", "invalid", and "not found" mean?
Valid means the announcement matches a published ROA (correct origin and prefix length). Invalid means it conflicts with a ROA (wrong origin or too specific). Not found means no ROA covers the prefix.
Why would a prefix have more than one origin AS?
Multiple origins (MOAS) can be legitimate (anycast, multihoming) or a sign of a hijack. Compare against the RPKI state and routing history to judge which it is.
