A /19 has the mask 255.255.224.0 and 8,190 usable hosts. The third octet steps in blocks of 32. You’ll see /19s as allocations to mid-sized organisations and as cloud VPC sizes for teams that want room to grow. Inside, they’re usually carved into /24s or smaller. A /19 starting at 10.0.32.0, for example, ends at 10.0.63.255.
Facts
- Prefix
- /19
- Subnet mask
- 255.255.224.0
- Wildcard mask
- 0.0.31.255
- Binary mask
- 11111111.11111111.11100000.00000000
- Total addresses
- 8,192
- Usable hosts
- 8,190
- Example range
- 192.168.0.0/19: 192.168.0.0 – 192.168.31.255
- Typical use
- Enterprise and campus networks.
Try it
Try: , ,
- CIDR block
- 192.168.0.0/19
- IP range
- 192.168.0.0 – 192.168.31.255
- Addresses
- 8,192
- Usable hosts
- 8,190
- Subnet mask
- 255.255.224.0
- Wildcard mask
- 0.0.31.255
Frequently asked questions
How many hosts are in a /19?
A /19 has 8,192 addresses. Subtracting the network and broadcast addresses leaves 8,190 usable hosts.
What is the subnet mask for /19?
/19 is 255.255.224.0 (wildcard mask 0.0.31.255). In binary that’s 19 ones followed by 13 zeros.