IP Subnet Netmask Calculator

IP Range Mask Optimizer

This tool calculates optimal netmasks for covering any range of IP addresses. Depending on the range of IP addresses entered, the result can be multiple masks.

IP range start value, e.g. 10.0.0.1

IP range end value, e.g. 10.0.4.255

CIDR Subnet Mask Calculator

Enter an IP and select a subnet mask to calculate the resulting subnet.

IP Address

Select Subnet Mask

Subnet Mask Calculator

Enter an IP address and a subnet mask (e.g. 255.255.255.0) to see network details.

IP Address

Subnet mask, e.g. 255.255.255.0