What does the number 28 behind the IP address 192.168.1.203/28 mean?

Question:

What does the number 28 behind the IP address 192.168.1.203/28 mean?

Answer:

28 is a subnet mask. IP address has 32 bits in total. 28 denotes network ID while rest of the bits (which are 4 bits) are used for hosts.

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