Typically, although the phrase “subnet mask” is preferred, you might use “IP/Mask” as a shorthand to define both the IP address and submask at once. In this situation, the IP address is followed by the number of bits in the mask. For example:
10.0.1.1/24
216.202.192.66/22
These are equivalent to
IP address: 10.0.1.1 with subnet mask of 255.255.255.0
IP address: 216.202.196.66 with a subnet mask example of 255.255.252.0
However, you do not mask the IP address, you mask the subnet.
