Reverse IP Lookup

What is Reverse IP Lookup?

Reverse IP lookup (also called reverse DNS lookup or shared hosting detection) identifies all domain names hosted on a single IP address. Unlike forward DNS which maps a domain to an IP, reverse IP maps an IP back to all domains sharing that server.

Shared hosting environments often host hundreds or thousands of domains on a single IP. This tool exposes that relationship — useful for security research and OSINT.

How to Use

1. Enter the target IP address in the input field.
2. Complete the ALTCHA Proof-of-Work challenge (runs automatically).
3. Click Lookup domains.
4. The first 50 domains display instantly. Click Yes to get the full list as a downloadable TXT file.

Common Use Cases

• Discover all sites on a target hosting server
• OSINT investigation — map attacker infrastructure
• Find related domains owned by same entity
• Identify phishing infrastructure
• Security research on shared hosting environments