ASN Lookup
Retrieve Autonomous System information for an IP address or domain
ASN Information
IP Range
Network Details
Detailed ASN Information
| Property | Value | Description |
|---|---|---|
| ASN | - | Autonomous System Number |
| Organization | - | Registered organization name |
| Country | - | Country of registration |
| IP Range | - | Allocated IP address range |
| Prefix | - | CIDR notation of the network |
| Network Name | - | Network identifier |
| Registry | - | Regional Internet Registry |
| Allocation Date | - | Date of IP allocation |
IP Geolocation
About ASN
An ASN (Autonomous System Number) uniquely identifies a network on the internet. It is used to determine network ownership and route traffic between systems via BGP.
Quick Stats
Pro Tip
ASN lookup is used to identify network ownership, analyze routing paths, and investigate potentially suspicious infrastructure.
Learn more & FAQ
What is an ASN lookup?
Every IP address on the internet belongs to an Autonomous System - a network operated by a single organization and identified by its ASN. This tool takes an IP, domain, or ASN directly and tells you which organization operates it, the network ranges it announces, and roughly where it's located - the quickest way to find out who is actually behind a server.
How to read your results
The ASN and organization name identify who operates the network. The announced prefix shows the full block of addresses registered to that ASN, and the map gives an approximate geographic location for the registration. If you looked up an IP expecting one provider and see a different organization, that usually means the service is hosted behind a CDN, proxy, or cloud provider rather than on its own infrastructure.
Frequently asked questions
What is an ASN?
An Autonomous System Number identifies a single network operator on the internet - an ISP, a hosting company, a university, a large enterprise. Every IP address belongs to exactly one ASN at a time, and that ASN is responsible for routing traffic to it.
Why would I need to look up an IP's ASN?
It's the fastest way to identify who actually operates a server - useful for abuse reports, checking whether traffic is coming from a known hosting provider vs. a residential ISP, or confirming a service genuinely runs on the infrastructure it claims to.
What's the difference between ASN lookup and a BGP route lookup?
ASN lookup tells you who owns an address and what organization it belongs to. A BGP route lookup goes a step further and shows how that address is currently being routed across the internet, including the path traffic takes to reach it.
Can I look up an ASN by number instead of an IP?
Yes - enter an ASN directly (e.g. AS15169) to see the organization and announced network ranges for that autonomous system, or enter an IP/domain to find out which ASN it falls under.
Why do large companies sometimes show multiple ASNs?
Large organizations, especially cloud providers, often operate several ASNs for different regions, services, or acquired companies - so the same company can show up under more than one ASN depending on which IP you look up.