BGP Looking Glass
See how a route appears in the global routing table. Enter an IP address, a CIDR prefix, an AS number, or a domain, and this looking glass reports the announced prefix, the origin AS and its holder, RPKI route-origin validity, how many of the RIS route collectors see it (a propagation check), and a few real AS paths. It also tells you which of the five Regional Internet Registries (RIRs) manages the resource — ARIN, RIPE NCC, APNIC, LACNIC or AFRINIC — and links you to that registry's own tools, since each RIR is the authority for its region.
Reviewed by the SysGlass team · Updated July 21, 2026
What it checks
- The announced prefix covering the IP (and whether only a less-specific is visible)
- The origin AS and its holder; flags multi-origin (MOAS) announcements
- RPKI route-origin validation: valid, invalid, or unknown (no ROA)
- Global visibility — how many RIS route collectors see the route
- Sample AS paths from real collectors, plus first/last seen
- The managing RIR (one of the five) and a link to its tools
How to read the result
- RPKI VALID is best; INVALID means validating networks may drop your route — fix the ROA or origin.
- UNKNOWN means there's no ROA yet; creating one in your RIR portal protects against hijacks.
- Low RIS-peer visibility means limited propagation; 0 peers means the route isn't in the global table.
- Multiple origin ASes (MOAS) can be legitimate, but can also indicate a hijack or leak — verify it.
- The RIR row tells you which registry to use for authoritative WHOIS and ROA management.
Frequently asked questions
What is a BGP looking glass?
A tool that shows how a prefix is seen in the internet's global routing table — which AS originates it, the AS paths to reach it, and how widely it's propagated. This one uses the RIPE NCC's RIS route collectors, which observe BGP worldwide.
What are the 5 RIRs and why does it matter?
The Regional Internet Registries — ARIN (North America), RIPE NCC (Europe/Middle East/Central Asia), APNIC (Asia-Pacific), LACNIC (Latin America/Caribbean) and AFRINIC (Africa) — allocate IP addresses and AS numbers in their regions. Each is the authority for WHOIS and RPKI ROA management of its resources, so the tool points you to the right one.
What does RPKI invalid mean?
The prefix is being announced from an AS (or with a length) that the published ROA doesn't authorize. Networks doing RPKI origin validation may reject the route, so it can become unreachable for them. Fix the ROA or announce from the authorized origin.
Can I look up an ASN or a domain too?
Yes. Enter an AS number (e.g. AS13335) to see its holder, neighbours and registry, or a domain to resolve it and inspect the route for its IP.