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/17 subnet mask
A /17 block has 32,768 addresses with the netmask 255.255.128.0.
255.255.128.0| CIDR notation | /17 |
| Netmask | 255.255.128.0 |
| Wildcard mask | 0.0.127.255 |
| Total addresses | 32,768 |
| Usable hosts | 32,766 |
| Usable in an AWS subnet | 32,763 |
| Example range | 10.0.0.0/17: 10.0.0.0 to 10.0.127.255 |
How /17 fits with other sizes
- A /8 holds 512 subnets of /17.
- A /16 holds 2 subnets of /17.
- It splits into 2 subnets of /18.
- It splits into 4 subnets of /19.
- It splits into 16 subnets of /21.