Reverse IP

Find all domains hosted on a specific IP address. Discover shared hosting neighbors and verify DNS reverse lookup configuration.

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APIPOST /api/v1/network/reverseip
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Try also: IP Geolocation
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Key Features

100% Free

No registration required, unlimited checks

Instant Results

Real-time analysis with detailed output

REST API Access

Integrate into your workflow via API

Accurate Data

Live queries to authoritative sources

What is Reverse IP?

Reverse IP lookup discovers all domain names hosted on a specific IP address, revealing which websites share the same web server. When multiple domains share an IP address, they are typically on a shared hosting environment where one server handles requests for many different websites using virtual hosting (name-based routing). This free tool is essential for cybersecurity researchers investigating malicious infrastructure (finding other domains controlled by the same threat actor), SEO specialists checking whether their hosting neighbors include spammy or penalized sites that could affect their domain's reputation, competitive analysts discovering related websites operated by the same company, penetration testers mapping the attack surface of a target IP, and hosting providers auditing server density.

The tool queries DNS databases and certificate transparency logs to build a comprehensive list of domains associated with the given IP address.

How to Use

  1. 1Enter the IP address you want to investigate (e.g., 93.184.216.34)
  2. 2Click 'Run Check' to find all domains hosted on that IP
  3. 3Review the list of domains sharing the server — each domain is clickable for further investigation
  4. 4Assess hosting density: a few domains suggests dedicated hosting, hundreds suggests shared hosting
  5. 5Check for suspicious or low-quality domains that could affect your site's reputation if you share the same IP

Who Uses This

System Administrators

Monitor and troubleshoot infrastructure

Developers

Debug network issues and integrate via API

SEO Specialists

Verify domain configuration and performance

Security Analysts

Audit and assess network security

Frequently Asked Questions

What is a reverse IP lookup and what does it reveal?
A reverse IP lookup queries databases to find all domain names that resolve to a specific IP address. It reveals which websites share the same physical or virtual server. For example, looking up the IP of a shared hosting server might reveal dozens or hundreds of domains. This is the opposite of a regular DNS lookup, which finds the IP for a given domain. Reverse IP helps you understand the hosting environment, identify co-hosted domains, and assess whether any problematic sites share your server.
How many domains can be on one IP address?
A single IP address can host anywhere from 1 to thousands of domains using virtual hosting (HTTP Host header or SNI-based routing). Shared hosting environments commonly host 100–500+ domains on a single IP. VPS and cloud servers typically host 1–20 domains. Dedicated servers usually host 1–5 domains. The number depends on the hosting configuration and server resources. Large shared hosting providers may pack many low-traffic sites onto one server to maximize efficiency.
Why would I need a reverse IP lookup?
Common use cases include: security investigations (finding other domains controlled by the same malicious actor), SEO analysis (checking if spammy or penalized websites share your IP, which could affect your site's reputation with search engines), competitive intelligence (discovering other websites or brands operated by the same organization), penetration testing (mapping all domains on a target server to identify potential entry points), and hosting evaluation (checking how crowded a shared hosting server is before purchasing a plan).
Does sharing an IP with bad websites affect my SEO?
In most cases, sharing an IP with low-quality or spammy websites does not directly affect your SEO. Google has confirmed that they do not penalize sites simply for being on shared hosting. However, in extreme cases — such as sharing an IP with hundreds of spam sites that trigger IP-level blocks — search engine crawlers might have difficulty reaching your site. If you're concerned about hosting neighbors, consider upgrading to a dedicated IP or VPS, which gives you a unique IP address that no other websites share.
What is the difference between reverse IP and reverse DNS?
Reverse DNS (rDNS) resolves a single IP address to its PTR record hostname — it answers 'what is the hostname of this IP?' and returns one result. Reverse IP lookup finds all domain names hosted on an IP address — it answers 'which websites are on this server?' and can return dozens or hundreds of results. Reverse DNS is used for email authentication and server identity verification, while reverse IP is used for hosting analysis, security research, and competitive intelligence.

Related Articles

Mastering Reverse IP Lookup: Your Ultimate GuideGuide

Mastering Reverse IP Lookup: Your Ultimate Guide

Unlock the secrets of reverse IP lookup to enhance your cybersecurity strategy. Discover how it works, its practical uses, and future trends.

NetVizor Team
Mar 25, 2026

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API Endpoint

POST /api/v1/network/reverseip
View Documentation