Inputs
A CIDR prefix length from 0 to 32.
AdeOS interactive tools
Subnet Mask ↔ CIDR ↔ Wildcard Converter
The fastest path from a prefix length to its subnet mask and wildcard mask, without the ACL framing.
Subnet Mask ↔ CIDR ↔ Wildcard
Quick ConverterCIDR
/24
Subnet Mask
255.255.255.0
Wildcard Mask
0.0.0.255
Show subnet mask and wildcard mask for any CIDR prefix.
Outputs
The equivalent dotted-decimal subnet mask and wildcard mask.
Example
Look up the mask and wildcard for /27 during a quick VLSM check.
Important note
Results support planning and learning; verify production changes against your platform and change controls.