What is my ASN?
An Autonomous System Number identifies a network on the internet. When a full Autonomous System Number database is unavailable, we show the best organization hint from reverse Domain Name System.
Network identity
FAQ
An Autonomous System Number is a unique ID for a network on the internet, usually run by an Internet Service Provider, cloud provider, or large organization. Routing between networks uses Autonomous System Number information.
It is a collection of Internet Protocol prefixes under one routing policy, usually run by an Internet Service Provider, cloud provider, or large organization.
A full Autonomous System Number lookup needs an Internet Protocol-to-Autonomous System Number database. When that data is missing, we show the best organization hint we have, or Unavailable, rather than inventing a number.
An Internet Service Provider is the company you know as your provider. An Autonomous System Number is the routing ID for a network on the internet. One Internet Service Provider can operate one or more Autonomous System Numbers; cloud and hosting networks have Autonomous System Numbers too.
Network operators, security teams, and researchers use Autonomous System Numbers for routing, filtering, and understanding where traffic comes from. Everyday browsing does not require you to know your Autonomous System Number.