CIDR subnet mask calculation

Calculate the IP address range from the IP address and subnet mask.
It can be used to calculate IPv4 addresses, including prefix display, number of address ranges, and bit notation.

CIDR calculation, when you want to check CIDR notation quickly.
To convert subnet mask to CIDR notation.
It can also be used as a quick reference table for subnet masks.
Bit notation is also available, so it is suitable for learning IPv4.