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/5 Subnet Mask: 248.0.0.0

A /5 prefix fixes the first 5 bits of the address as the network, leaving 27 bits for hosts. That gives 134,217,728 addresses, of which 134,217,726 can be assigned to hosts.

CIDR notation/5
Subnet mask248.0.0.0
Wildcard mask7.255.255.255
Binary mask11111000.00000000.00000000.00000000
Hex mask0xF8000000
Total addresses134,217,728
Usable hosts134,217,726

Example: 0.0.0.0/5

  • Network address: 0.0.0.0
  • First usable host: 0.0.0.1
  • Last usable host: 7.255.255.254
  • Broadcast address: 7.255.255.255

When to use a /5 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 /5?

The subnet mask for /5 is 248.0.0.0, and its wildcard (inverse) mask is 7.255.255.255.

How many hosts are in a /5?

A /5 contains 134,217,728 addresses. Subtracting the network and broadcast addresses leaves 134,217,726 usable hosts.