Resolve a domain to its IP address, or reverse-lookup an IP to its hostname.
Every domain ultimately points to one or more IP addresses where its server lives. This tool resolves a domain to its IPv4/IPv6 address, or works in reverse — taking an IP address and finding the hostname associated with it, useful for verifying server ownership or diagnosing email/hosting issues.
Common uses: confirming a domain now points to your new server after a migration, checking which hostname an unfamiliar IP in your server logs belongs to, and verifying reverse DNS (PTR) is set up correctly, which many mail providers check before accepting email from a server.
Larger sites often use multiple servers or a CDN (content delivery network) for speed and redundancy, so several IPs can be perfectly normal.
Reverse DNS (PTR) records are optional and set up by the server's owner. Many IPs, especially on shared hosting, simply don't have one configured.
Every device on the internet has an IP address. Look one up to see its approximate location, ISP and network details — useful for checking where your own traffic appears to come from, investigating suspicious logins, or geolocation debugging.
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