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ASN and IP prefix lookup
Find the network (ASN) that owns an IP address, domain or AS number, and the prefixes it announces.
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- Works on any device
About ASN and IP prefix lookup
An autonomous system number (ASN) identifies the network that routes a block of IP addresses on the internet. Enter an IP, domain or AS number to see its owner and the prefixes it announces over BGP. Useful when tracing abuse, checking hosting providers or debugging routing.
How to use ASN and IP prefix lookup
- Type an IP address, a domain or an AS number.
- Run the lookup.
- Read the owner of the network and the list of prefixes it announces.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
What does an ASN tell me about an IP?
It shows which organisation, usually an ISP or hosting company, routes that address on the internet. It does not identify the individual user behind the IP.
What is an IP prefix in the results?
A prefix is a block of addresses written like 203.0.113.0/24. The network announces these blocks to the internet so traffic knows where to go.
Can one domain belong to more than one ASN?
Yes. A domain can have several IP addresses, such as a website, a mail server and a CDN, and each may sit in a different network. Look up each address to see them.
Is ASN and IP prefix lookup free?
Yes. ASN and IP prefix lookup on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put ASN and IP prefix lookup on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.