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IP to ISP Locator

Discover the Internet Service Provider (ISP), Autonomous System Number (ASN), and organization for any IP address instantly.

💡 How to Use This Tool

Looking up an ISP and Autonomous System Number (ASN) from an IP address is simple. Follow these steps:

1

Enter IP Address

Type or paste any IPv4 or IPv6 address into the search box above. By default, it shows your own IP address.

2

Click Lookup

Press the "Lookup ISP" button. The tool queries our secure local database of IP assignments.

3

View Results

Instantly see the owning organization (ISP), their AS Number, and the specific subnet prefix block.

📖 About IP to ISP Locator

What is the IP to ISP Tool?

This tool allows you to find the Internet Service Provider (ISP), organization, and Autonomous System Number (ASN) associated with any IPv4 or IPv6 address. It uses the reliable MaxMind GeoLite2 ASN database to provide accurate and quick lookups completely offline.

Use Cases

  • Network Engineering: Identify which organization owns a particular block of IP addresses or ASN.
  • Security & Fraud Prevention: Check if an IP belongs to a known datacenter, VPN provider, or specific residential ISP.
  • Troubleshooting: Identify routing issues or verify the ISP of users experiencing connectivity problems.
  • Analytics Enrichment: Map IP addresses from your logs to ISPs to understand your user base better.

Key Features

ASN Identification

Find the Autonomous System Number an IP address belongs to. An ASN uniquely identifies an administrative domain on the Internet.

ISP & Organization Data

Determine the exact organization or ISP that manages the IP space, completely offline for maximum privacy.

Network CIDR Range

See the specific IP subnet block (CIDR) that contains the requested IP address.

Privacy & Security

Your privacy is our priority. All IP address lookups are performed directly on our servers using a local database. We do not transmit the IP addresses you check to any third-party APIs or external services. No logs are kept of the IP addresses you query.

❓ Frequently Asked Questions

An ISP (Internet Service Provider) is an organization that provides services for accessing, using, or participating in the Internet.
An Autonomous System Number (ASN) uniquely identifies a network on the Internet. It is used by routers to exchange routing information with other networks.
Yes, we use the industry-standard MaxMind GeoLite2 ASN database, which is regularly updated to provide accurate information about IP address ownership.
No. All lookups are performed directly on our servers completely offline and anonymously. We do not keep logs of the IP addresses you submit or share them with third parties.

Version History

1.0.0

Initial release of IP to ISP lookup tool

Mar 01, 2026