// Tool · US Edition
BGP Looking Glass
US-focused BGP route lookups. Registration data comes straight from ARIN's RDAP service, and live AS paths come from RIS collectors located in the United States — New York (NYIIX), Palo Alto (Equinix), and Miami (NOTA). Pick a source location to see how the prefix looks from that vantage point, or switch to global if you want to compare the US view against the rest of the world.
Accepts: ASN (AS13335 or 13335) · IPv4 · IPv6 · CIDR prefix
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Frequently Asked Questions
What is a BGP looking glass?
A looking glass is a public, read-only window into the BGP routing table of one or more routers. It lets you see how the internet reaches a given prefix — the AS path, next hops, and which networks are propagating the route — from a vantage point other than your own.
What does the AS path tell me?
The AS path is the list of autonomous systems a route traverses, read right-to-left from origin to observer. BGP uses it for loop prevention and as a primary path-selection tiebreaker — all else equal, shorter paths are preferred.
Which route collectors does this looking glass query?
It queries RIPE RIS route collectors located in the United States (New York, Palo Alto, and Miami) and enriches the results with ARIN whois data for the origin network.
Why do I see multiple different paths to the same prefix?
Each collector peers with different networks, so each sees its own best path. Comparing them reveals how reachability differs by location and which upstream providers a network is using.
