ASN Lookup — Find Network by IP or AS Number
Identify the network behind an IP or ASN
How to Use This Tool
- Enter AS number (e.g. AS13335) or any IP.
- BGP and geo databases are queried.
- View name, country, prefix.
About This Tool
An autonomous system (AS) is a large network with a single routing policy — think of an ISP or cloud provider. The ASN lookup tool maps an IP or AS number to organization name and routing prefix.
Common use cases
- •Identify the network behind suspicious traffic
- •Document ASN for routing or peering discussions
What is an ASN?
Autonomous System Numbers identify networks on the internet for BGP routing. When you see AS15169, that block belongs to Google's network operations.
Why analysts use ASN data
Blocking or allowing entire ASNs affects all IPs in that network. Security policies sometimes allowlist cloud provider ASNs instead of millions of individual IPs.
Frequently Asked Questions
Yes. VSPIC offers this ASN lookup at no cost with no account required. Results load in real time.
We do not permanently store your queries on our servers. Some tools run entirely in your browser; others fetch public data for the request only.
Yes. Open the page in any modern phone or tablet browser. Results work on Wi‑Fi and mobile data.
IP lookup gives geo and ISP branding for one address. ASN lookup shows the formal network registration and prefix.
Need your public IP first?
Instantly see IPv4, IPv6, ISP, city, and map before other network tests.
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