YurlieSubnet Mask Calculator
Convert prefix lengths (/24) to subnet masks and vice versa. Includes wildcard mask, hex, binary, and host count. Full /0–/32 reference table.
Subnet mask
255.255.255.0Prefix length
/24Wildcard mask
0.0.0.255Mask (hex)
0xFFFFFF00Wildcard (hex)
0x000000FFBinary
11111111.11111111.11111111.00000000Total IPs
256Usable hosts
254Subnet mask reference
PrefixSubnet maskWildcardUsable hosts
CIDR Prefix Length vs Subnet Mask
A prefix length like /24 means the first 24 bits of the address are the network portion. The equivalent subnet mask 255.255.255.0 uses 1-bits for network and 0-bits for host portions.