ASN Lookup

What is ASN Lookup Tool?

This tool allows you to look up the Autonomous System Number (ASN) information for a given IP address. You can enter either an IPv4 or IPv6 address to retrieve ASN details.

For more details and API access, visit ToolStackCentral.

How to Use:

Simply enter a valid IPv4 or IPv6 address in the input box below and click the “Lookup” button. The tool will then fetch and display the corresponding ASN details.

What is ASN?

An Autonomous System Number (ASN) is a unique number assigned to an autonomous system (AS) for routing purposes on the Internet. An AS is a collection of IP networks and routers under the control of one or more network operators that share a common, clearly defined routing policy.

ASN numbers are used by internet service providers (ISPs), content delivery networks (CDNs), and other organizations to identify and exchange routing information between different networks on the internet.


  • Q: What is the difference between IPv4 and IPv6?
    A: IPv4 and IPv6 are both addressing systems used to identify devices on a network. IPv4 uses a 32-bit address scheme allowing for a total of 2^32 addresses, while IPv6 uses a 128-bit address scheme allowing for a virtually unlimited number of addresses.
  • Q: Can I enter both IPv4 and IPv6 addresses?
    A: Yes, you can enter either an IPv4 or IPv6 address into the input box.
  • Q: What if the tool doesn’t find any ASN information for the provided IP address?
    A: If the provided IP address is invalid or no ASN information is found, the tool will display an error message.
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