Subnet Calculator

With the Subnet Calculator you can calculate a subnet, split subnets and create a wide subnet. Both IPv4 and IPv6 are supported.

Calculator

On the Calculator tab, you can calculate a subnet by entering the IP address and the subnet mask. The subnet mask can be entered in CIDR notation.

Example inputs:

  • 10.0.0.0/16
  • 192.168.0.0/255.255.255.0
  • 2001:db8::/32

SubnetCalculator_Calculator

Right-click on the result to copy the information.

Subnetting

On the Subnetting tab, you can split a subnet into smaller subnets. The subnet mask can be entered in CIDR notation.

Example inputs:

Subnet New subnet mask
10.0.0.0/16 /18
192.168.0.0/255.255.255.0 255.255.255.128
2001:db8::/32 /48

SubnetCalculator_Subnetting

Right-click on the result to copy or export the information.

Wide Subnet

On the Wide Subnet tab, you can create a wide subnet that includes both given subnets. The subnet mask can be entered in CIDR notation.

Example inputs:

Subnet 1 Subnet 2
10.0.0.0/16 10.2.0.0/16
192.168.0.0/255.255.255.0 192.168.4.0/23

IPv6 is not supported.

SubnetCalculator_WideSubnet

Right-click on the result to copy the information.