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/2 Subnet Mask: 192.0.0.0

A /2 prefix fixes the first 2 bits of the address as the network, leaving 30 bits for hosts. That gives 1,073,741,824 addresses, of which 1,073,741,822 can be assigned to hosts.

CIDR notation/2
Subnet mask192.0.0.0
Wildcard mask63.255.255.255
Binary mask11000000.00000000.00000000.00000000
Hex mask0xC0000000
Total addresses1,073,741,824
Usable hosts1,073,741,822

Example: 0.0.0.0/2

  • Network address: 0.0.0.0
  • First usable host: 0.0.0.1
  • Last usable host: 63.255.255.254
  • Broadcast address: 63.255.255.255

When to use a /2 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 /2?

The subnet mask for /2 is 192.0.0.0, and its wildcard (inverse) mask is 63.255.255.255.

How many hosts are in a /2?

A /2 contains 1,073,741,824 addresses. Subtracting the network and broadcast addresses leaves 1,073,741,822 usable hosts.