ASN Lookup
Look up Autonomous System (ASN) details: organization, IPv4/IPv6 prefixes, and peering. Free ASN lookup via BGPView.
About this ASN Lookup tool
An ASN identifies a network on the internet. CheckHub fetches the organization, registered prefixes, and peering data to help you understand who owns or routes a given IP block.
How to use the ASN Lookup
- Step 1. Enter an AS number (e.g. AS13335) or an IP.
- Step 2. Read the org, prefix list, and peer relationships.
Frequently asked questions
- What is an ASN?
- A globally unique identifier assigned to a network operator (ISP, CDN, hosting provider) so that BGP can route traffic between networks.
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