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 saved file is September 2026, retrieved on 2026-09-08. DB-IP publishes the Lite file monthly under CC BY 4.0; our controller checks for a new month after the seventh and keeps the previous dated file when refresh fails. Every result shows its month and age. Past 60 days it is labelled stale, and past 120 days it is a historical record rather than a claim about current routing.

Why does a private address like 192.168.1.1 return nothing?

Private ranges such as 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 are reused across separate networks, so one address alone does not identify a unique AS. The browser explains private, special-purpose and unsupported lookup exclusions locally. Some special-purpose addresses are globally reachable; exclusion does not prove an address is unroutable, unowned or safe.

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?

IP Address Lookup adds approximate country, region and city from the dated City Lite file. This page provides ASN attribution and can also look up the ranges recorded for a supplied AS number. It has no geography, WHOIS registration or current route information.

Does the lookup keep the address I type?

The route adds no query logs or saved results and sends your query in a same-site POST body rather than a URL. Hosting infrastructure still processes requests under its own policies. Your browser saves valid queries only after deliberate edits; restoration does not write, and invalid edits preserve the saved value. Forget saved query removes it while keeping the current field on screen. Start over also clears the saved key.

Can I search by company name, WHOIS, BGP peers or reputation?

The input accepts one literal IP address or one AS number. This page does not provide company-name searches, bulk queries, supplied CIDR blocks, WHOIS registration and contact records, peering relationships, reputation scores or routing histories. An organization name is the dated attribution in this file, with no ownership confirmation or guarantee about current assignment.

ASN Lookup

Look up one IPv4 or IPv6 address to read the AS number, organization and containing range attributed by the September 2026 DB-IP Lite file. Enter an AS number such as AS13335 to read every range the file records for it, 100 rows per page with the total in view. Copy or select the complete current page, including its count and snapshot date. The file is stored on this site and read on our server, with no account, quota or per-visitor request to a paid lookup provider. This is dated attribution with reduced Lite coverage and accuracy, not a live BGP feed or ownership verification.

IP or ASNDB-IP Litesnapshot 2026-09

Enter an IP address or an AS number, then press Look up.

Nothing is looked up until you do.

8.8.8.8IPv4 address
the AS number and organisation recorded for it
AS15169by number
organisation and the ranges in this snapshot
10.0.0.1private address
named as private, no lookup

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. Lite has reduced coverage and accuracy. 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 saved file is September 2026, retrieved on 2026-09-08. DB-IP publishes the Lite file monthly under CC BY 4.0; our controller checks for a new month after the seventh and keeps the previous dated file when refresh fails. Every result shows its month and age. Past 60 days it is labelled stale, and past 120 days it is a historical record rather than a claim about current routing.
Why does a private address like 192.168.1.1 return nothing?: Private ranges such as 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 are reused across separate networks, so one address alone does not identify a unique AS. The browser explains private, special-purpose and unsupported lookup exclusions locally. Some special-purpose addresses are globally reachable; exclusion does not prove an address is unroutable, unowned or safe.
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?: IP Address Lookup adds approximate country, region and city from the dated City Lite file. This page provides ASN attribution and can also look up the ranges recorded for a supplied AS number. It has no geography, WHOIS registration or current route information.
Does the lookup keep the address I type?: The route adds no query logs or saved results and sends your query in a same-site POST body rather than a URL. Hosting infrastructure still processes requests under its own policies. Your browser saves valid queries only after deliberate edits; restoration does not write, and invalid edits preserve the saved value. Forget saved query removes it while keeping the current field on screen. Start over also clears the saved key.
Can I search by company name, WHOIS, BGP peers or reputation?: The input accepts one literal IP address or one AS number. This page does not provide company-name searches, bulk queries, supplied CIDR blocks, WHOIS registration and contact records, peering relationships, reputation scores or routing histories. An organization name is the dated attribution in this file, with no ownership confirmation or guarantee about current assignment.

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. Lite has reduced coverage and accuracy.