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/32 Subnet Mask

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A /32 subnet mask is 255.255.255.255, with 1 addresses and 1 usable host.

CIDR prefix/32
Subnet mask255.255.255.255
Subnet mask (binary)11111111.11111111.11111111.11111111
Wildcard mask0.0.0.0
Network bits / host bits32 / 0
Total addresses1
Usable hosts1
/32 subnets in a /816,777,216
/32 subnets in a /1665,536
/32 subnets in a /24256

The mask ends exactly on an octet boundary, so every address in a /32 block shares its first 4 octets. A single address. Used for host routes, loopback addresses, firewall rules and access-control entries.

Try it with an address

Example /32 subnets in 192.168.1.0/24

Network First usable host Last usable host Broadcast
192.168.1.0/32 192.168.1.0 192.168.1.0 -
192.168.1.1/32 192.168.1.1 192.168.1.1 -
192.168.1.2/32 192.168.1.2 192.168.1.2 -
192.168.1.3/32 192.168.1.3 192.168.1.3 -
192.168.1.4/32 192.168.1.4 192.168.1.4 -
192.168.1.5/32 192.168.1.5 192.168.1.5 -
192.168.1.6/32 192.168.1.6 192.168.1.6 -
192.168.1.7/32 192.168.1.7 192.168.1.7 -

Frequently asked questions

What is the subnet mask for /32?

A /32 subnet mask is 255.255.255.255. In binary that is 11111111.11111111.11111111.11111111: 32 network bits followed by 0 host bits. The wildcard mask is 0.0.0.0.

How many usable hosts are in a /32?

A /32 is a single address, so it holds exactly 1 host.

How many /32 subnets fit in a /24?

A /24 divides into 256 subnets of size /32, because each extra mask bit doubles the number of subnets.

Other prefix lengths

← /31 Full CIDR chart

Calculate this over HTTP: curl https://networkcalc.com/api/ip/192.168.1.0/32. See the Subnet Calculator API.