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/6 Subnet Mask: 252.0.0.0

A /6 prefix fixes the first 6 bits of the address as the network, leaving 26 bits for hosts. That gives 67,108,864 addresses, of which 67,108,862 can be assigned to hosts.

CIDR notation/6
Subnet mask252.0.0.0
Wildcard mask3.255.255.255
Binary mask11111100.00000000.00000000.00000000
Hex mask0xFC000000
Total addresses67,108,864
Usable hosts67,108,862

Example: 0.0.0.0/6

  • Network address: 0.0.0.0
  • First usable host: 0.0.0.1
  • Last usable host: 3.255.255.254
  • Broadcast address: 3.255.255.255

When to use a /6 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 /6?

The subnet mask for /6 is 252.0.0.0, and its wildcard (inverse) mask is 3.255.255.255.

How many hosts are in a /6?

A /6 contains 67,108,864 addresses. Subtracting the network and broadcast addresses leaves 67,108,862 usable hosts.