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/19 subnet mask
A /19 block has 8,192 addresses with the netmask 255.255.224.0.
255.255.224.0| CIDR notation | /19 |
| Netmask | 255.255.224.0 |
| Wildcard mask | 0.0.31.255 |
| Total addresses | 8,192 |
| Usable hosts | 8,190 |
| Usable in an AWS subnet | 8,187 |
| Example range | 10.0.0.0/19: 10.0.0.0 to 10.0.31.255 |
How /19 fits with other sizes
- A /8 holds 2,048 subnets of /19.
- A /16 holds 8 subnets of /19.
- It splits into 2 subnets of /20.
- It splits into 4 subnets of /21.
- It splits into 16 subnets of /23.