Kodura Subnet Calculator

A subnet calculator that answers before you finish typing. Open it and the mask, wildcard and host count are already on screen. Drag the prefix and watch every value move with it. Type an address when you want the actual range — network, broadcast, first and last usable host. SEE THE BOUNDARY Most calculators print the mask in binary as a wall of ones and zeros. What actually matters is where the network ends and the host portion begins, so this draws that boundary as a ruler of 32 bits, grouped into octets, and lets you drag it. IPv6 DONE PROPERLY Compressed and expanded forms, embedded IPv4, zone identifiers, RFC 5952 canonical output. Address counts are exact — a /0 holds a 39-digit number, and this reports it rather than rounding. Prefixes report how many /64 subnets they contain, because that is the unit IPv6 is actually allocated in. CORRECT AT THE EDGES /31 point-to-point links…