IP Address Resolver

Enter an IP address to find its hostname (reverse DNS), the organization that owns the network, its address range and location.

Your IP address, 216.73.216.157, is filled in. Replace it with any IPv4 or IPv6 address, or a domain name.

Frequently asked questions

What does resolving an IP address mean?

Resolving turns an IP address into its hostname using reverse DNS (a PTR record), for example 8.8.8.8 resolves to dns.google. It's the opposite of a normal DNS lookup, which turns a name into an address.

Why doesn't every IP address have a hostname?

Reverse DNS is set by whoever controls the IP block, usually an ISP or hosting company. Many home connections and cloud servers have no PTR record, or a generic one.

Who owns an IP address?

IP blocks are assigned by regional registries such as ARIN, RIPE and APNIC to ISPs, hosting companies and large organizations. The network owner shown here comes from those registries' public records.