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IPv4 Netmask Converter
Convert between CIDR prefix length, dotted subnet mask, wildcard mask, and hex — with address and usable-host counts.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Netmask forms
| Prefix length | — |
|---|---|
| CIDR suffix | — |
| Subnet mask | — |
| Subnet mask (hex) | — |
| Subnet mask (binary) | — |
| Wildcard mask | — |
| Wildcard mask (hex) | — |
| Total addresses | — |
| Usable hosts | — |
How it works
Enter any one of: a prefix length (24 or /24), a dotted subnet mask (255.255.255.0), or a wildcard mask (0.0.0.255). Usable-host count follows the common convention: prefix ≤ /30 subtracts the network and broadcast addresses, /31 has 2 usable addresses per RFC 3021, and /32 is a single host. A dotted mask that is valid both ways — only 0.0.0.0 and 255.255.255.255 — is read as a subnet mask, so 0.0.0.0 is /0 and 255.255.255.255 is /32; write the prefix length to state the other reading.