What is the default class C subnet mask?

The default subnet mask for Class C addresses is 255.255.255.0. This subnet mask allows for a network to accommodate up to 256 IP addresses, out of which 254 can be assigned to devices since one address is reserved for the network itself and another for the broadcast address. Class C addresses are typically used for smaller networks, making this subnet mask suitable for environments where a limited number of devices need to be connected.

In a Class C address, the first three octets (the first 24 bits) are used to identify the network, while the last octet is used for host addresses within that network. This configuration supports fine-grained control over who can connect and the size of the network while still managing a reasonable address range. Understanding this concept is crucial for effective network planning and management, particularly in scenarios where small to medium-sized networks are prevalent.