What is a /19 subnet?
8,190 usable hosts out of 8,192 addresses, behind netmask 255.255.224.0.
| Prefix | /19 |
|---|---|
| Netmask | 255.255.224.0 |
| Wildcard | 0.0.31.255 |
| Total addresses | 8,192 |
| Usable hosts | 8,190 |
| Example block | 10.0.0.0/19 |
| Usable host range | 10.0.0.1 – 10.0.31.254 |
| Broadcast | 10.0.31.255 |
A /19 fixes the first 19 bits of the address as the network and leaves 13 for hosts — 8,192 addresses in all.
Of those, 8,190 can be given to a machine: the first address names the network itself, and the last is the broadcast address.
This is the usual size for a VPC or a site: room for tens of thousands of addresses, divided into smaller subnets per zone or per service.
It is 32 times the size of a /24.
Other subnet sizes
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