Reverse IP Lookup
Find the hostname (PTR), ISP, organization, and location for any IP address. Reverse IP is the opposite of domain → IP: enter an IP and see what it resolves to. Free, no signup.
Look Up an IP
Enter an IPv4 or IPv6 address to see its hostname (reverse DNS), ISP, and location.
What Is Reverse IP Lookup?
Normal lookup is "domain → IP." Reverse IP is the other way: "IP → what do we know about it?" That can mean (1) the hostname assigned to the IP (reverse DNS / PTR), (2) the ISP or organization that owns it, or (3) in some contexts, a list of domains that resolve to that IP. This tool gives you the hostname (PTR) plus country, region, city, ISP, and organization in one place.
We use the same data as our reverse DNS lookup (for PTR) and IP lookup (for full details). For your own IP, start with What is my IP.
How to Use Reverse IP Lookup
Enter any public IPv4 or IPv6 address and click "Look up." You'll see the hostname (PTR), country, region, city, ISP, and organization. For full details including a map, use our IP lookup or IP location finder. For connectivity to that IP, use our ping test or traceroute tool. For domain records (A, MX, etc.), use DNS lookup.
Features
- Reverse DNS (hostname / PTR) for any IP
- Country, region, city, ISP, organization
- Free, no signup, no storage
- Works with IPv4 and IPv6
Why Use This Tool
Server admins use it to confirm a hostname or who owns an IP. Abuse teams use it to find the right ISP to contact. Security teams use it to see if an IP is hosting or VPN. Combine with DNS lookup when debugging domains, or IP blacklist check for email reputation.
FAQs
What is reverse IP lookup?
Reverse IP lookup usually means either (1) finding the hostname for an IP (reverse DNS / PTR) or (2) finding which domains or services point to or use that IP. Our IP lookup and reverse DNS tools cover both.
How do I find domains on an IP?
There is no single public database of “all domains on this IP.” You can use our IP lookup to see the hostname (PTR) and organization; for more you’d need third-party or commercial reverse IP services.
Is reverse IP lookup the same as reverse DNS?
Reverse DNS is one type: IP → hostname (PTR). “Reverse IP” is sometimes used for that, or for “which domains resolve to this IP.” We offer reverse DNS; use our IP lookup for full details.
Can I do reverse IP lookup for free?
Yes. Use our reverse DNS lookup for hostname (PTR) and our IP lookup for geolocation, ISP, and organization. Both are free.
Why would I need reverse IP lookup?
Common uses: finding the hostname of a server, checking shared hosting, abuse reporting, or verifying which organization owns an IP.