ASN Lookup

Look up any Autonomous System Number

This free online tool allows you to perform an ASN Lookup. By entering an Autonomous System Number (ASN), you can retrieve information about the network associated with it. This includes data such as the organization name, ASN allocation date, and the country of registration.

An Autonomous System (AS) is a collection of IP routing prefixes under the control of one or more network operators that presents a common, clearly defined routing policy to the internet. Each AS is assigned a unique ASN, used for routing and administrative purposes. ASNs are critical for the management of internet routing, allowing ISPs and large organizations to control the flow of internet traffic efficiently.

Whether you're researching network ownership, looking to understand more about internet routing, or simply curious about a particular ASN, our tool provides quick and easy access to the information you need.

What is an ASN Lookup?

An ASN Lookup is a tool or service that allows users to query an Autonomous System Number (ASN) to retrieve information about the autonomous system associated with it. This includes the organization that manages the AS, the ASN registration date, and the geographical location associated with the ASN. ASNs play a crucial role in the routing of internet traffic, enabling ISPs and large organizations to manage their specific routing policies effectively.

ASN Lookup tools are widely used by network administrators, cybersecurity professionals, and researchers to understand better the structure of the internet, investigate network-related issues, or assess routing policies and practices.

How does an ASN Lookup work?

An ASN Lookup works by querying a database of ASNs and their associated information. This database is compiled and maintained by Regional Internet Registries (RIRs), which are responsible for allocating IP addresses and ASNs within specific geographical regions. When a user enters an ASN into the lookup tool, it searches the database for the matching ASN and returns information about the autonomous system, such as the organization's name, contact details, and the IP address ranges managed by the AS.

The tool may also provide additional details such as the AS's routing policies, peers, and the history of the ASN assignments. This information is crucial for understanding the global internet infrastructure and analyzing specific networks' connectivity and performance.