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ASN Lookup Tool

Find details about any Autonomous System Number (ASN) including owner, organization, and correct routing paths.

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Our ASN lookup tool helps you retrieve information about an Autonomous System. This network lookup tool identifies the ISP or organization owning an IP block. Use this check asn tool to investigate network paths, verify hosting providers, and analyze internet infrastructure relationships.

About This Tool

Lookup Network Details

Our ASN lookup tool helps you retrieve information about an Autonomous System. This network lookup tool identifies the ISP or organization owning an IP block.

ASN Details
ISP Info
IP Routing
AI-Powered SEO
by Dofollo.ai
20+
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Forever

Understanding ASN Data

An Autonomous System (AS) is a collection of IP networks controlled by a single operator.

Good

Identified

ASN owner and details found successfully.

Info

Organization

Displays the company or ISP responsible for the network.

Metric

Prefixes

Shows size and IP ranges announced by the ASN.

Benefits

Why It Matters

1

Identifies the true owner of an IP address block

See if traffic comes from a residential ISP, cloud provider, or business.

2

Helps troubleshoot routing and connectivity issues

Understand which major network operates the connection.

3

Essential for security and abuse reporting

Know who to contact if bad traffic originates from an IP.

4

Verifies hosting and infrastructure providers

Confirm if a site is hosted where it claims to be.

How To Improve

Analyze Networks

Enter IP/ASN

Input an IP address or ASN (e.g., AS12345).

View Owner

Identify the ISP or organization name.

Check Reputation

Use ASN info to assess the trustworthiness of the network.

FAQs

Frequently Asked Questions about ASN Lookup

ASN stands for Autonomous System Number. It is a unique identifier for a network on the internet.
Regional Internet Registries (RIRs) like ARIN, RIPE, APNIC, etc.
To find out which ISP or company owns an IP address or network.
Yes, an ASN represents a large network containing many IP addresses.
Yes, ASN lookup is free.
No, it is a query against public databases.
Border Gateway Protocol (BGP) uses ASNs to route traffic between networks.
Rarely, but IP blocks can be transferred between ASNs.
Every website is hosted on an IP, which belongs to an ASN.
It is based on the latest global routing table data.
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