Which of the following ranges is a valid class C network numbers?

(A) 128.0.0.0 - 191.255.0.0
(B) 1.0.0.0 - 126.0.0.0
(C) 192.0.0.0 - 223.255.255.0
(D) 224.0.0.0 - 254.255.255.0

192.0.0.0 - 223.255.255.0 is the correct answer.

Description	Class A	Class B	Class C
First octet range	1 – 126	128 – 191	192 – 223
Valid network numbers	1.0.0.0 – 126.0.0.0	128.0.0.0 – 191.255.0.0	192.0.0.0 – 223.255.255.0
Default mask	255.0.0.0	255.255.0.0	255.255.255.0