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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

Subnet Calculator - Calculator

note

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:

SubnetNew subnet mask
10.0.0.0/16/18
192.168.0.0/255.255.255.0255.255.255.128
2001:db8::/32/48

Subnet Calculator - Subnetting

note

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 1Subnet 2
10.0.0.0/1610.2.0.0/16
192.168.0.0/255.255.255.0192.168.4.0/23
note

IPv6 is not supported.

Subnet Calculator - Wide Subnet

note

Right-click on the result to copy the information.