CIDR prefix
/19
255.255.224.0
8,190 usable hosts · 8,192 addresses
The mask for /19 is 255.255.224.0 — 8,192 addresses, 8,190 usable hosts. Campus and larger office networks; /22–/23 are common for offices with a few hundred devices.
Mask
255.255.224.0
Wildcard
0.0.31.255
Addresses
8,192
Hosts
8,190
Worked example: 192.168.0.0/19
Network address192.168.0.0/19
Broadcast address192.168.31.255
First host192.168.0.1
Last host192.168.31.254
FAQ — /19
What is the subnet mask for /19?
The subnet mask for /19 is 255.255.224.0 (wildcard: 0.0.31.255). The first 19 bits are the network part, the remaining 13 are the host part.
How many hosts fit in a /19?
A /19 block holds 8,192 addresses, of which 8,190 are usable hosts (the network and broadcast addresses are excluded).
How many /19 subnets fit in a /16?
A /16 network divides into 8 /19 subnets.
What is a /19 used for?
Campus and larger office networks; /22–/23 are common for offices with a few hundred devices.