ASN WHOIS Lookup
Look up an autonomous system number (ASN) to see who owns it and its registration details.
Continue your work
- IP Location Lookup — Find the ASN of an IP address.
- IP WHOIS Lookup — See the owner of a specific IP range.
Share this tool
Found it useful? Send it to a friend or teammate.
Rate this tool
0.0
0 ratings
- 5 stars 0
- 4 stars 0
- 3 stars 0
- 2 stars 0
- 1 star 0
Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the ASN WHOIS Lookup
Look up an autonomous system number (ASN) to see who owns it and its registration details.
- 1 Enter an AS number with or without the AS prefix, such as AS13335.
- 2 Click Look up ASN.
- 3 Review the organization and contacts in the registry record.
Example and practical tips
AS15169 returns GOOGLE, registered to Google LLC with ARIN. You will often find ASNs in IP location results, BGP tools and firewall logs.
Frequently asked questions
What is an ASN?
An autonomous system number identifies a network that controls its own routing on the internet, such as an ISP, cloud provider or large company.
Where do I find an IP address’s ASN?
The IP location lookup shows the ASN of any IP address, which you can then look up here.
Report an issue
Something broken or not quite right? Tell us and we will look into it.