CIDR prefix
/15
255.254.0.0
131,070 usable hosts · 131,072 addresses
The mask for /15 is 255.254.0.0 — 131,072 addresses, 131,070 usable hosts. Large enterprise and carrier networks.
Mask
255.254.0.0
Wildcard
0.1.255.255
Addresses
131,072
Hosts
131,070
Worked example: 10.0.0.0/15
Network address10.0.0.0/15
Broadcast address10.1.255.255
First host10.0.0.1
Last host10.1.255.254
FAQ — /15
What is the subnet mask for /15?
The subnet mask for /15 is 255.254.0.0 (wildcard: 0.1.255.255). The first 15 bits are the network part, the remaining 17 are the host part.
How many hosts fit in a /15?
A /15 block holds 131,072 addresses, of which 131,070 are usable hosts (the network and broadcast addresses are excluded).
How many /15 subnets fit in a /8?
A /8 network divides into 128 /15 subnets.
What is a /15 used for?
Large enterprise and carrier networks.