LoginSign Up

/3 Subnet Mask: 224.0.0.0

A /3 prefix fixes the first 3 bits of the address as the network, leaving 29 bits for hosts. That gives 536,870,912 addresses, of which 536,870,910 can be assigned to hosts.

CIDR notation/3
Subnet mask224.0.0.0
Wildcard mask31.255.255.255
Binary mask11100000.00000000.00000000.00000000
Hex mask0xE0000000
Total addresses536,870,912
Usable hosts536,870,910

Example: 0.0.0.0/3

  • Network address: 0.0.0.0
  • First usable host: 0.0.0.1
  • Last usable host: 31.255.255.254
  • Broadcast address: 31.255.255.255

When to use a /3 subnet

Huge address blocks allocated to regional internet registries and large organizations; rarely used for subnetting.

Frequently Asked Questions

What is the subnet mask for /3?

The subnet mask for /3 is 224.0.0.0, and its wildcard (inverse) mask is 31.255.255.255.

How many hosts are in a /3?

A /3 contains 536,870,912 addresses. Subtracting the network and broadcast addresses leaves 536,870,910 usable hosts.