Look up Autonomous System Number (ASN) information including network prefixes, peering details, and organization data.
Our tools are designed to be intuitive, but if you need assistance, we're here to help.
Professional-grade email and DNS diagnostic tools trusted by IT professionals worldwide.
An autonomous system number identifies a network that runs its own routing policy on the internet. Look up an ASN from an IP address to see who owns the network, which prefixes it advertises, and where it sits in the routing hierarchy, context that separates one provider's traffic from another's during an investigation.
Learn about Autonomous System Numbers, network routing, peering relationships, and how to interpret ASN data effectively.
This page provides original, human-reviewed information about ASN lookups, explaining autonomous system numbers, BGP prefix ownership, and why ASN context helps diagnose routing and reputation issues.
An Autonomous System Number (ASN) is a unique identifier assigned to a network or group of networks that are under the control of a single organization and have a unified routing policy.
Border Gateway Protocol (BGP) uses ASNs to make routing decisions and prevent loops.Each ASN represents a routing domain with its own policies.
IXPs are physical locations where multiple networks connect to exchange traffic efficiently.
Our tools are designed to be intuitive, but if you need assistance, we're here to help.
Professional-grade email and DNS diagnostic tools trusted by IT professionals worldwide.
