ASN Lookup
Find the Autonomous System behind any IP address, or look up an AS number to see which organization owns the network.
Look up an ASN
Enter an IP address or an AS number. Leave blank to use your own connection.
Looking up your connection…
What an ASN lookup reveals
The internet isn't one network — it's tens of thousands of independent networks that agree to route traffic to each other. Each of these is an Autonomous System, identified by a number (its ASN). When you look up an IP address here, we resolve the ASN that announces it and show you the organization in charge, so you can tell at a glance whether traffic is riding your ISP, a mobile carrier, a VPN, or a cloud host.
You can also go the other way: type an AS number and we'll fetch the registered organization and details for that network. It's the same information network engineers use to read BGP routing — made readable for everyone.
How to read the result
- Organization is the entity that owns and routes the network. This is the most useful field for identifying who actually carries your traffic.
- A hosting or cloud name (rather than a consumer ISP) usually means the address belongs to a server, VPN or proxy — not a home connection.
- Country here is where the network is registered, which can differ from where a specific IP is used.
Frequently asked questions
What is an ASN?
An Autonomous System Number (ASN) is a unique ID for a network that controls its own routing on the internet — typically an ISP, a hosting company or a large enterprise. ASNs are how networks announce which IP ranges they're responsible for via BGP.
What's the difference between an ASN and an IP address?
An IP address identifies a single endpoint; an ASN identifies the whole network that endpoint sits inside. Many millions of IP addresses can belong to one ASN. Looking up an IP tells you which ASN carries it.
Can I search by AS number directly?
Yes. Enter a number like 15169 or AS15169 to look up the organization, or paste an IP address to find the ASN it belongs to. Either input works.
Why does my ASN belong to a company I've never heard of?
Your ISP may operate under a parent company or a wholesale network name that differs from your retail brand. VPNs, mobile carriers and hosting providers also show their own ASN rather than your home provider's.
Know your network — now test it.
Identifying your ASN is half the story. Run a full check-up to measure how that network actually performs, and get plain-English advice on fixing any weak spots.
Run a full diagnosis