LoginSign Up

/32 Subnet Mask: 255.255.255.255

A /32 prefix fixes the first 32 bits of the address as the network, leaving 0 bits for hosts. That gives 1 addresses, of which 1 can be assigned to hosts.

CIDR notation/32
Subnet mask255.255.255.255
Wildcard mask0.0.0.0
Binary mask11111111.11111111.11111111.11111111
Hex mask0xFFFFFFFF
Total addresses1
Usable hosts1

Example: 192.168.1.0/32

  • Network address: 192.168.1.0
  • First usable host: 192.168.1.0
  • Last usable host: 192.168.1.0

When to use a /32 subnet

A single host address. Used for loopback interfaces, host routes, and firewall or security group rules that target exactly one IP.

  • 16,777,216 /32 subnets fit in a /8.
  • 65,536 /32 subnets fit in a /16.
  • 256 /32 subnets fit in a /24.

Frequently Asked Questions

What is the subnet mask for /32?

The subnet mask for /32 is 255.255.255.255, and its wildcard (inverse) mask is 0.0.0.0.

How many hosts are in a /32?

A /32 contains 1 address, and all of them are usable because it identifies a single host.