Lookup the owner and contact information for a domain name or IP address.

Trace the packet path from our servers to your domain using this traceroute tool.

Perform a DNS or reverse-DNS lookup on a hostname or IP address.

Ping a hostname or IP address times milliseconds apart.

Learn all there is to know about a particular IP address.

Look up a country TLD and associated IP ranges.

Enter an IPv4/IPv6 address or equivalent decimal, binary or hexadecimal number to convert between the formats. Prefix hexadecimal numbers with "0x" (0xf93c3bd).

Find out what information websites know about you based simply on what your browser tells us, such as OS/browser, location and ISP.

Enter an IPv4 or IPv6 address or autonomous system number to view information about that system.

Select an IP version then enter a CIDR notation, or enter an IP address and adjust the bitmask, netmask or hosts values, to determine a CIDR block and IP range.

IP Address and Version
IPv4 IPv6

Bitmask

Netmask

Number of Hosts/Addresses

Start Address	End Address
CIDR Block

Enter an IPv4 or IPv6 start and end addresses to determine the CIDR block(s) that contain them.

Start IP Address

End IP Address



CIDR Block(s)