---
title: "What Is Reverse IP Lookup? Definition for B2B | ONEGTMLAB"
description: "Reverse IP lookup matches an IP address to the domain or organization behind it. Learn how B2B teams use it to identify companies visiting their site."
canonical: https://www.onegtmlab.dev/glossary/reverse-ip-lookup
---

# What Is Reverse IP Lookup? Definition for B2B | ONEGTMLAB

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GTM Glossary

# Reverse IP Lookup

Reverse IP lookup is the process of matching an IP address to information about who uses it, such as the domain names hosted on it or the organization it is registered to.

Also called: website visitor identification, IP to company lookup

## Why it matters

In networking, reverse IP lookup is used to find the domains hosted on a server. In B2B marketing, a related form matches the IP address of a website visitor to the company network it likely comes from. That lets a team see which companies are researching its site, even when no one fills in a form, and use those visits as a buying signal.

The method has limits. Remote work, mobile networks, VPNs and shared networks mean many visits cannot be matched, and some matches are wrong. It usually identifies a company, not a person.

## Example

A company's visitor identification tool shows that someone from a mid-sized insurer viewed its pricing page and two case studies this week. The account is in its target list, so the account owner checks who the likely buyers are, looks for any recent news at the insurer and starts a relevant outreach sequence.

## Related terms

-   [Intent Data](/glossary/intent-data)
-   [Buying Signals](/glossary/buying-signals)
-   [First-Party Data](/glossary/first-party-data)
-   [Account-Based Marketing (ABM)](/glossary/account-based-marketing)
-   [Firmographics](/glossary/firmographics)

## Related service

[Account-Based Marketing Tier your named accounts, act on their signals and reach the whole buying committee.](/services/account-based-marketing)

## Related playbook

-   [Intent Data Playbook Score fit and timing separately, act on stacked signals, and read every signal by meaning.](/growth-playbooks/intent-data)

[← All GTM terms, A to Z](/glossary)

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