IPv4 subnet calculator
Turn an address and prefix into the whole network.
Calculate the network, subnet mask, wildcard, broadcast address, usable range, and address count for an IPv4 CIDR block.
What does the slash number mean?
The CIDR prefix specifies how many of the 32 IPv4 bits identify the network. A /24 leaves eight host bits, producing 2⁸ or 256 addresses. The subnet mask is the same boundary expressed in dotted decimal.