What Does Netmask Mean?
Netmask is a term used in computer networking to define the class and range of Internet Protocol (IP) addresses.Netmask provides the available number range of IP addresses From Class A to Class C, and specifies a mask to divide these networks into sub-networks (subnets).
Netmask and subnet are often used alternatively. In fact, subnets are created after the application of netmask.