All tools / Subnet cheat sheet
/32 subnet mask
A /32 block has 1 addresses with the netmask 255.255.255.255. A single address. Used in security groups, firewall rules and routes to match exactly one host.
255.255.255.255| CIDR notation | /32 |
| Netmask | 255.255.255.255 |
| Wildcard mask | 0.0.0.0 |
| Total addresses | 1 |
| Usable hosts | 1 |
| Usable in an AWS subnet | n/a (AWS allows /16 to /28) |
| Example range | 10.0.0.0/32: 10.0.0.0 to 10.0.0.0 |
How /32 fits with other sizes
- A /8 holds 16,777,216 subnets of /32.
- A /16 holds 65,536 subnets of /32.
- A /20 holds 4,096 subnets of /32.
- A /24 holds 256 subnets of /32.