IP Address Tools100% Free20 tools

Free IP Tools: Lookup, Converters and Subnet Calculator

These free IP tools help you find your address, look up owners, test connections and convert or calculate IPv4 and IPv6 values. Most run in your browser, and none needs a signup or a paid API.

My IP and lookups

What Is My IP AddressSee your public IPv4 or IPv6 address and its reverse DNS name. IP to Hostname LookupFind the hostname (reverse DNS) of an IPv4 or IPv6 address. Domain to IP LookupFind the IPv4 and IPv6 addresses behind any domain name. IP WHOIS LookupFind the owner, range and country of an IPv4 address. IPv6 WHOIS LookupFind the owner, prefix and country of an IPv6 address.

Network testing

Ping IPv4 AddressSend 4 pings to an IPv4 address or domain and read the latency. Ping IPv6 AddressSend 4 pings to an IPv6 address or domain and read the latency. TracerouteTrace every hop between our server and an IP or domain. Open Ports LookupTest 23 common ports on your own IP address and find risky ones.

Conversion and subnetting

IP to DecimalConvert an IPv4 or IPv6 address to decimal, hex and binary. IPv4 to IPv6Show the IPv4-mapped, 6to4 and NAT64 IPv6 forms of an IPv4 address. IPv6 to IPv4Extract the IPv4 address embedded in an IPv6 address. IP Subnet CalculatorCalculate network, broadcast, host range and subnets for an IPv4 block.

IPv6 tools

Local IPv6 Address GeneratorGenerate a random fd00::/8 unique local /48 prefix and subnets. IPv6 CIDR to RangeTurn an IPv6 CIDR prefix into its first and last address. IPv6 Range to CIDRConvert a start and end IPv6 address into the smallest CIDR list. IPv6 Compression ToolShorten long IPv6 addresses to their compact standard form. IPv6 ExpandExpand a short IPv6 address to its full 8-group form. IPv6 Compatibility CheckerTest whether a domain, its name servers and mail servers support IPv6.

Email

Email Header AnalyzerPaste raw email headers to trace the route and check SPF, DKIM and DMARC.

How These IP Tools Work

The conversion and calculator tools run entirely in your browser, so what you type never leaves your device. The lookup, ping, traceroute and WHOIS tools send a request from our server and show the answer as it comes back.

To keep the service fast for everyone, each visitor can run a limited number of network tests per minute. Ping and traceroute results show the view from our server, not from your own connection.

Which IP Tool Should I Use?

Need your own address? Open your public IP checker.
Who owns an address? Use the registry owner lookup, or the reverse DNS tool.
Planning a network? The subnet calculator and the IPv6 tools save hours of manual maths.
Checking an email? The header tracer shows where it really came from.

Standards: RFC 791, the Internet Protocol specification.