IP Subnet Calculator

An IP subnet calculator determines network address, broadcast address, usable host range, and total hosts from an IP address and CIDR notation (e. g

The calculator uses the standard published formula for ip subnet. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: CIDR /n = first n bits are network, rest are host bits. Each step in the calculation is shown so you can verify the result manually.