An IP subnet calculator takes an IPv4 address and a subnet mask or CIDR prefix, like 192.168.1.10/24, and tells you the network address, broadcast address, usable host range and number of hosts. Network admins, IT students and gamers setting up home networks use it to plan and troubleshoot networks quickly.
Here’s how subnetting works. An IPv4 address has 32 bits. The CIDR prefix tells you how many bits are the network portion; the rest are for hosts. A /24 leaves 8 host bits, giving 2⁸ = 256 addresses, of which 254 are usable (one is the network address and one is the broadcast). A /26 leaves 6 host bits: 64 addresses and 62 usable hosts.
Example: 192.168.10.75/26. The subnet mask is 255.255.255.192. Subnets of /26 increase in blocks of 64, so 75 falls in the 64 to 127 block. The network address is 192.168.10.64, the broadcast is 192.168.10.127, and usable hosts run from .65 to .126.
Tips: memorize the block sizes for common prefixes (/24 = 256, /25 = 128, /26 = 64, /27 = 32, /28 = 16), and remember that private ranges like 192.168.0.0/16 and 10.0.0.0/8 are used inside home and business networks. For IPv6, subnetting uses 128-bit addresses and different conventions.
Tips for getting accurate results from the IP Subnet Calculator: double-check that every input uses the right units, enter numbers without commas or symbols, and run the calculation a second time with a quick estimate in your head to confirm the answer looks reasonable.
How to use the IP Subnet Calculator on Minedit: enter your values in the fields, press calculate, and review the step-by-step breakdown under the result. If something looks off, change one input at a time to see how it affects the answer, which is also a great way to learn the math behind it.
Learn more on Wikipedia’s subnetwork article. Find subnet mask, hex and XOR calculators on Minedit.