Definition - What does Netmask mean?
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.
Techopedia explains Netmask
- 255.0.0.0 for Class A with an 8-bit netmask
- 255.255.0.0 for Class B with a 16-bit netmask
- 255.255.255.0 for Class A with a 24-bit netmask