~/netref / Mask ↔ CIDR
##

Mask ↔ CIDR Converter

Paste a subnet mask (255.255.255.0), a wildcard (0.0.0.255), or a prefix (/24) — it resolves all three.

input
$
CIDR prefix
/24
Subnet mask
255.255.255.0
Wildcard
0.0.0.255
Host bits
8
Usable hosts
254
Total addrs
256
// mask in binary
11111111.11111111.11111111.00000000