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/18 subnet mask
A /18 block has 16,384 addresses with the netmask 255.255.192.0.
255.255.192.0| CIDR notation | /18 |
| Netmask | 255.255.192.0 |
| Wildcard mask | 0.0.63.255 |
| Total addresses | 16,384 |
| Usable hosts | 16,382 |
| Usable in an AWS subnet | 16,379 |
| Example range | 10.0.0.0/18: 10.0.0.0 to 10.0.63.255 |
How /18 fits with other sizes
- A /8 holds 1,024 subnets of /18.
- A /16 holds 4 subnets of /18.
- It splits into 2 subnets of /19.
- It splits into 4 subnets of /20.
- It splits into 16 subnets of /22.