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/15 Subnet Mask

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A /15 subnet mask is 255.254.0.0, with 131,072 addresses and 131,070 usable hosts.

CIDR prefix/15
Subnet mask255.254.0.0
Subnet mask (binary)11111111.11111110.00000000.00000000
Wildcard mask0.1.255.255
Network bits / host bits15 / 17
Total addresses131,072
Usable hosts131,070
/15 subnets in a /8128

The mask ends 7 bits into octet 2, so blocks step in increments of 2 in that octet.

Try it with an address

Example /15 subnets in 10.0.0.0/8

Network First usable host Last usable host Broadcast
10.0.0.0/15 10.0.0.1 10.1.255.254 10.1.255.255
10.2.0.0/15 10.2.0.1 10.3.255.254 10.3.255.255
10.4.0.0/15 10.4.0.1 10.5.255.254 10.5.255.255
10.6.0.0/15 10.6.0.1 10.7.255.254 10.7.255.255
10.8.0.0/15 10.8.0.1 10.9.255.254 10.9.255.255
10.10.0.0/15 10.10.0.1 10.11.255.254 10.11.255.255
10.12.0.0/15 10.12.0.1 10.13.255.254 10.13.255.255
10.14.0.0/15 10.14.0.1 10.15.255.254 10.15.255.255

Frequently asked questions

What is the subnet mask for /15?

A /15 subnet mask is 255.254.0.0. In binary that is 11111111.11111110.00000000.00000000: 15 network bits followed by 17 host bits. The wildcard mask is 0.1.255.255.

How many usable hosts are in a /15?

A /15 holds 131,072 addresses in total. Subtracting the network and broadcast addresses leaves 131,070 usable hosts.

How many /15 subnets fit in a /8?

A /8 divides into 128 subnets of size /15, because each extra mask bit doubles the number of subnets.

Other prefix lengths

← /14 Full CIDR chart /16 →

Calculate this over HTTP: curl https://networkcalc.com/api/ip/192.168.1.0/15. See the Subnet Calculator API.