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/23 subnet mask
A /23 block has 512 addresses with the netmask 255.255.254.0.
255.255.254.0| CIDR notation | /23 |
| Netmask | 255.255.254.0 |
| Wildcard mask | 0.0.1.255 |
| Total addresses | 512 |
| Usable hosts | 510 |
| Usable in an AWS subnet | 507 |
| Example range | 10.0.0.0/23: 10.0.0.0 to 10.0.1.255 |
How /23 fits with other sizes
- A /8 holds 32,768 subnets of /23.
- A /16 holds 128 subnets of /23.
- A /20 holds 8 subnets of /23.
- It splits into 2 subnets of /24.
- It splits into 4 subnets of /25.
- It splits into 16 subnets of /27.