ASN Lookup
Type an IPv4 or IPv6 address and this page tells you which AS number the snapshot attributes it to, the organisation name recorded against that number, and the exact range the address falls in. Type an AS number instead, as AS13335 or 13335, and you get the same organisation plus every range the file records for it, 100 rows a page with the total in view. The answer comes from the DB-IP Lite IP-to-ASN database for September 2026, stored on this site and read on our own server, so there is no sign-up, no per-visitor call to a paid lookup service and no quota. It is a snapshot of a file, not a routing feed: it lists no peers, no route announcements and no statement about who owns a network, and the month it came from is printed beside every answer.
Enter an IP address or an AS number, then press Look up. Nothing is looked up until you do.
The ranges listed are the ones this file attributes to an AS number, capped at 100 a page. It is not a routing table: there are no peers, no route announcements and no statement about who owns a network.
Dated, and read from a file we hold. Answers from a dated DB-IP Lite snapshot, and the date is shown beside every answer. Routing changes between snapshots, so this is what the file recorded rather than what is announced right now, and it is not a live BGP feed. The answers come from the DB-IP Lite IP-to-ASN database for September 2026 (2026-09), stored on this site and read on our server rather than fetched from a third party per visit. ASN data from db-ip.com under CC BY 4.0.
Common questions
- What is an ASN?
- An Autonomous System is a group of IP ranges run under one routing policy, and its AS number is how the rest of the internet refers to that group. AS13335 is Cloudflare, AS15169 is Google, AS174 is Cogent. A lookup here gives you the number, the organisation name the DB-IP Lite file records against it, and the ranges that file attributes to it.
- How do I find the AS number for an IP address?
- Paste the address into the field and press Look up. The page searches the sorted range table in the September 2026 snapshot for the one range that contains that address, then shows the AS number, the organisation and the matched range, in CIDR form when the range is exactly one block. Both ends of a range count as inside it, so the first and last address of a block resolve to the same network.
- Does this show BGP peers or route announcements?
- No. This is a monthly file of ranges and the AS numbers they were attributed to, so there are no peers in it, no route announcements and nothing about transit or upstreams. If you need what a network is advertising at this moment, a looking glass or a route collector is the right tool; this page is the offline answer to which AS number a range was recorded under.
- How current is the data, and what happens when it ages?
- The database is the DB-IP Lite IP-to-ASN file for September 2026, published monthly by db-ip.com under CC BY 4.0 and refreshed here on the same schedule. Every answer carries that month. Once a snapshot passes 60 days the page says so beside the result, and past 120 days it labels the answer as a record of that month rather than presenting it as the current picture.
- Why does a private address like 192.168.1.1 return nothing?
- Because no single network is attributed to it. Ranges such as 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 (RFC 1918) are reused inside millions of separate networks, and reserved ranges like 127.0.0.0/8 or 169.254.0.0/16 never appear on the public internet at all. The page recognises those in your browser, names the range and the RFC that defines it, and does not send them to the server.
- Can I see every range for a large AS number?
- Yes, a page at a time. The tool shows 100 ranges per page with the total beside them, so AS174 reads as ranges 1 to 100 of 4,688 and you step through with Previous and Next. Nothing is trimmed in silence: if the count says 4,688, the pages hold 4,688.
- What is the difference between this and your IP address lookup?
- The IP address lookup answers one address and adds the registered country, region and city from the DB-IP city file. This page is the network view: it goes the other way too, from an AS number to the full list of ranges recorded for it, and it carries no geography at all.
- Does the lookup keep the address I type?
- The route does not log the query, does not store it and never puts it in a URL. Your own browser remembers the last query under one local storage key so the field is still filled when you come back, and the Start over button at the top of the page clears it.
Answers from a dated DB-IP Lite snapshot, and the date is shown beside every answer. Routing changes between snapshots, so this is what the file recorded rather than what is announced right now, and it is not a live BGP feed.