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The default subnet mask for an IP address depends on which class the IP address belongs to. IP addresses are divided into classes A, B, and C based on their first octet (the first set of numbers in the IP address).
An IP address starting with:
– 1 to 126 is Class A and has a default subnet mask of 255.0.0.0.
– 128 to 191 is Class B and has a default subnet mask of 255.255.0.0.
– 192 to 223 is Class C and has a default subnet mask of 255.255.255.0.
Given the IP address 201.142.23.12 falls within the range of 192 to 223, it is a Class C address. Therefore, the default subnet mask for this IP address is 255.255.255.0.