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/24 Subnet Mask: 255.255.255.0

A /24 prefix fixes the first 24 bits of the address as the network, leaving 8 bits for hosts. That gives 256 addresses, of which 254 can be assigned to hosts. Before CIDR, /24 was the default mask of a Class C network.

CIDR notation/24
Subnet mask255.255.255.0
Wildcard mask0.0.0.255
Binary mask11111111.11111111.11111111.00000000
Hex mask0xFFFFFF00
Total addresses256
Usable hosts254

Example: 192.168.1.0/24

  • Network address: 192.168.1.0
  • First usable host: 192.168.1.1
  • Last usable host: 192.168.1.254
  • Broadcast address: 192.168.1.255

When to use a /24 subnet

The most common LAN size: a typical home or office network (for example 192.168.1.0/24) and a common cloud subnet size.

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

Frequently Asked Questions

What is the subnet mask for /24?

The subnet mask for /24 is 255.255.255.0, and its wildcard (inverse) mask is 0.0.0.255.

How many hosts are in a /24?

A /24 contains 256 addresses. Subtracting the network and broadcast addresses leaves 254 usable hosts.