/19 Subnet: Mask 255.255.224.0, 8,190 Usable Hosts
A /19 subnet has a subnet mask of 255.255.224.0 and contains 8,192 total IP addresses, of which 8,190 are usable host addresses (the network and broadcast addresses are reserved). A /19 contains 32 /24 networks.
| CIDR notation | /19 |
|---|---|
| Subnet mask | 255.255.224.0 |
| Wildcard mask | 0.0.31.255 |
| Mask in binary | 11111111.11111111.11100000.00000000 |
| Total addresses | 8,192 (2^13) |
| Usable hosts | 8,190 |
| Host bits | 13 |
Usable hosts in a /19 by platform
Cloud providers reserve more than the usual two addresses per subnet, so the same /19 gives you fewer usable IPs in the cloud than on a standard LAN.
| Platform | Reserved IPs | Usable hosts |
|---|---|---|
| Standard (network + broadcast) | 2 | 8,190 |
| AWS VPC | 5 | 8,187 |
| Microsoft Azure VNet | 5 | 8,187 |
| Google Cloud VPC | 4 | 8,188 |
| Oracle Cloud VCN | 3 | 8,189 |
Good to know
A /19 subnet has a 255.255.224.0 mask and 8,192 total addresses (8,190 usable). Each step from /19 to /20 halves the block; each step back to /18 doubles it.
How a /19 is calculated
- The /19 means the first 19 bits are the network portion, leaving 13 host bits.
- Total addresses = 2^(32 - 19) = 2^13 = 8,192.
- Usable hosts (standard) = 8,192 - 2 (network + broadcast) = 8,190.
- Subnet mask = 255.255.224.0; wildcard mask = 0.0.31.255.
Want to split a /19 into smaller subnets, see every address range, or plan a VLSM layout? Open the free subnet calculator →