Network Tools
IP address lookup, IPv4 validation, and CIDR/subnet calculators for network engineers.
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What Is My IP Address?
See the public IP address your browser is connecting from. Nothing is stored, nothing is logged, and your IP is never sent to analytics.
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IPv4 Address Validator
Validate an IPv4 address with precise error reasons: wrong segment count, out-of-range octets, or ambiguous leading zeros. Runs entirely in your browser.
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CIDR Calculator
Enter a CIDR block such as 192.168.1.0/24 to get the network and broadcast addresses, masks, usable host range and host count — including correct /31 and /32 behaviour.
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Subnet Calculator
Calculate subnet details from an IP address plus a mask or prefix. Shows network, broadcast, mask, wildcard, host range and host count, all client-side.