Q15,paper 3,D 12. In classful addressing, an IP address 123.23.156.4 belongs to ______ class format.

(A) A

(B) B

(C) C

(D) D

Explanation.

Answer(A).

First octet	Address Class
0-127	Class A
128-191	Class B
192-223	Class C
224-239	Class D
240-255	Class E