cidr 24
When a home router shows 192.168.1.1, it is announcing a /24 network: this page walks through the mask, total addresses and usable hosts of that block before you open the calculator.
The address given, .10, falls in the middle of the usable range; any address from .1 to .254 in this block can be assigned to a LAN device.
The /24 math is identical inside the 10.0.0.0/8 range: only the last octet varies, so the total stays at 256 addresses and 254 usable ones.
The wildcard is the bitwise inverse of the mask, used in Cisco router ACL rules in place of the ordinary mask.
Yes. It helps visualize the main subnetting outputs for both IPv4 and IPv6, including split scenarios and more detailed planning workflows.
A /24 has 256 addresses in total, the result of 2 raised to 8 host bits; after subtracting the network address and the broadcast, 254 addresses remain that can actually be assigned to hosts, running from .1 to .254 in the last octet.
Because 192.168.0.0/16, reserved by RFC 1918 for private networks, contains 256 different /24 blocks; manufacturers pick one of them as the factory default because 254 usable hosts already cover any home or small office without needing VLSM.
Yes: splitting the remaining 8 host bits gets you two /25s of 126 hosts each, four /26s of 62 hosts, or even smaller sizes depending on each segment need, using VLSM instead of one fixed prefix.
All calculations run locally in your browser. Nothing is sent to the network or to external services.