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Reverse IP Lookup - Find All Domains Hosted on Same IP Address

Reverse IP Lookup

Find all domains hosted on the same IP address to identify shared hosting environments.

What is Reverse IP Lookup?

Reverse IP Lookup is the process of finding all domain names that resolve to a specific IP address. This is useful for discovering websites hosted on shared hosting servers, identifying virtual hosts, and investigating server configurations. Unlike reverse DNS (PTR records), which typically returns one hostname, reverse IP lookup attempts to find all domains configured to point to the IP.

What You'll Discover:

  • PTR Records: Official reverse DNS hostname for the IP
  • Shared Hosting Domains: Other websites sharing the same server
  • Virtual Hosts: Multiple domains configured on the same IP
  • Server Configuration: Insight into hosting architecture

Why Use Reverse IP Lookup?

  • Security Research: Identify related websites and potential phishing sites
  • Competitor Analysis: Discover other sites on the same hosting
  • Server Investigation: Understand shared hosting environments
  • Network Mapping: Document server configurations
  • SEO Analysis: Check if competitors share your IP (shared hosting)
  • Troubleshooting: Identify resource-hogging neighbors on shared hosting

How to Use the Reverse IP Lookup

Step 1: Enter an IP address (e.g., 192.0.2.1)
Step 2: Click "Lookup Domains" to search for hosted domains
Step 3: Review the list of domains found on the IP
Step 4: Use "Copy Results" to save the domain list

Example Reverse IP Lookup:

Input: 192.0.2.100

Results (3 domains found):
Domain: example.com
Type: PTR Record
Info: Reverse DNS lookup

Domain: shop.example.com
Type: Hosted Domain
Info: Found on shared hosting

Domain: blog.example.com
Type: Hosted Domain
Info: Found on shared hosting

Shared Hosting vs Dedicated IP:

Aspect Shared Hosting Dedicated IP
Domains per IP Multiple (dozens to hundreds) One or few domains
Cost Lower Higher
Performance Shared resources Dedicated resources
SEO Impact Potential negative neighbor effect Isolated reputation
SSL Certificate Shared or SNI Easier setup

Understanding Results:

  • PTR Record: Official reverse DNS set by hosting provider or owner
  • Hosted Domain: Additional domains found through various lookup methods
  • No Results: May indicate dedicated IP or privacy-protected hosting
  • Many Results: Indicates shared hosting or CDN infrastructure

Limitations:

  • Free reverse IP APIs have daily rate limits
  • Some hosting providers block reverse IP enumeration
  • CDNs may show multiple unrelated domains
  • Recently added domains may not appear immediately

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