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/16 subnet mask
A /16 block has 65,536 addresses with the netmask 255.255.0.0. The largest VPC CIDR block AWS allows, and the size of the private range 192.168.0.0/16.
255.255.0.0| CIDR notation | /16 |
| Netmask | 255.255.0.0 |
| Wildcard mask | 0.0.255.255 |
| Total addresses | 65,536 |
| Usable hosts | 65,534 |
| Usable in an AWS subnet | 65,531 |
| Example range | 10.0.0.0/16: 10.0.0.0 to 10.0.255.255 |
How /16 fits with other sizes
- A /8 holds 256 subnets of /16.
- It splits into 2 subnets of /17.
- It splits into 4 subnets of /18.
- It splits into 16 subnets of /20.