Calculate network details including wildcard masks, supernetting, VLSM subnetting, and address allocation planning.
Network Calculator converts IPv4 CIDR input into the boundaries and masks needed to size or combine networks. It reports network and broadcast endpoints, subnet and wildcard masks, address capacity, and the usable range. Its planning functions cover supernets and VLSM allocations for different host requirements. A wildcard mask is the bitwise inverse of the subnet mask, not another notation for the same mask. A summarized supernet can also cover addresses beyond the original networks when they do not form one exact aligned block. Network plans stay in the browser, so private addressing is not uploaded.
A concrete input and expected output from the current implementation.
Input
192.168.10.0/26
Expected output
Network: 192.168.10.0/26 Subnet mask: 255.255.255.192 Wildcard mask: 0.0.0.63 Broadcast: 192.168.10.63 Usable range: 192.168.10.1 - 192.168.10.62 Total addresses: 64 Usable hosts: 62
A /26 prefix leaves 6 host bits, producing 2^6 = 64 addresses from .0 through .63. Excluding the network and broadcast endpoints leaves 62 conventional host addresses; the final mask octet of 192 has the wildcard complement 63.
For an IPv4 /n prefix, n high-order bits identify the network and 32-n bits identify positions inside it. The subnet mask has ones in the prefix positions, while the wildcard has ones in the remaining positions. Clearing all host bits yields the network endpoint; setting them yields the broadcast endpoint. Capacity is 2^(32-n) before any addresses are excluded from ordinary host use.
A VLSM segment occupies a power-of-two address block large enough for its requirement and begins on that block's CIDR boundary. Different block sizes can therefore share one parent network. Supernetting works in the opposite direction: smaller networks share a shorter prefix when their leading bits match. The resulting summary must be checked for additional address space that was not among the original networks.
Yes, for IPv4 wildcard notation, each octet is 255 minus the corresponding subnet-mask octet. A /26 subnet mask of 255.255.255.192 therefore has the wildcard 0.0.0.63. The wildcard marks bit positions permitted to vary in systems using that convention. Do not substitute it where configuration syntax asks for a subnet mask or CIDR prefix.
Usually no. CIDR blocks contain power-of-two address counts, and an ordinary subnet also has network and broadcast endpoints. For example, 20 conventional host addresses require a /27: it provides 32 total addresses and 30 usable ones. A /28 provides only 16 total and 14 conventionally usable addresses, so it is too small.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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