AS Number Lookup
Organization name, network counts, and IP prefixes for any AS number
Organization Search
Search AS numbers by company or network name
IP Lookup
Find the ASN, network, and location of any IP address or domain.
Frequently Asked Questions
What is an ASN?
An Autonomous System Number (ASN) identifies a network on the internet, such as a hosting provider, an ISP, or a large company. Each AS holds a set of IP address blocks.
What does ASN Lookup show?
Enter an AS number, like AS13335, to see the organization name, how many IPv4 and IPv6 networks the AS holds, its total IPv4 addresses, and the list of network prefixes.
Can I search by company name?
Yes. Type an organization name, like cloudflare, to list the AS numbers whose names contain it. Select an AS number to see its networks.
How do I find the ASN of a domain or an IP address?
Use IP Lookup. It shows the ASN and organization for any IP address or domain.