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/4 Subnet Mask: 240.0.0.0

A /4 prefix fixes the first 4 bits of the address as the network, leaving 28 bits for hosts. That gives 268,435,456 addresses, of which 268,435,454 can be assigned to hosts.

CIDR notation/4
Subnet mask240.0.0.0
Wildcard mask15.255.255.255
Binary mask11110000.00000000.00000000.00000000
Hex mask0xF0000000
Total addresses268,435,456
Usable hosts268,435,454

Example: 0.0.0.0/4

  • Network address: 0.0.0.0
  • First usable host: 0.0.0.1
  • Last usable host: 15.255.255.254
  • Broadcast address: 15.255.255.255

When to use a /4 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 /4?

The subnet mask for /4 is 240.0.0.0, and its wildcard (inverse) mask is 15.255.255.255.

How many hosts are in a /4?

A /4 contains 268,435,456 addresses. Subtracting the network and broadcast addresses leaves 268,435,454 usable hosts.