ASN Lookup

Look up ASN, organization, and country for an IP address.

An Autonomous System Number (ASN) uniquely identifies a network organization on the internet. Our ASN lookup tool retrieves the ASN, organization name, and country for any IP address.

Result

Enter an IP to look up ASN.
In Action

ASN Lookup in action

Your CDN logs show massive traffic from one IP range. An ASN lookup reveals the range belongs to a hosting provider, not real visitors — so you block the ASN at the firewall instead of wasting time on individual IPs. One lookup, one rule, problem gone.

Frequently Asked Questions

What is an ASN?

An ASN (Autonomous System Number) is a unique identifier for a network organization.

How do I find the ASN of an IP address?

Enter the IP and the tool returns its ASN, AS name, country, and announced prefixes. This identifies which network operator (ISP, cloud, or CDN) owns the address space.

What does ASN stand for and why does it matter?

ASN stands for Autonomous System Number — the identifier of a network that routes traffic independently. Knowing the ASN tells you which organization is really behind an IP, useful for abuse reports and routing diagnostics.

How do I report abuse using ASN information?

The ASN lookup shows the owner organization. Most operators publish an abuse contact (abuse@their-domain). Reporting with the exact IP, timestamp, and logs to the right ASN gets action much faster than generic complaints.