To understand Classful vs Classless IP addresses, we first need to know what IP address classes are in the first place. IP address classes are as follows:
Class Range
A 0.0.0.0 to 127.255.255.255
B 128.0.0.0 to 191.255.255.255
C 192.0.0.0 to 223.255.255.255
D 224.0.0.0 to 239.255.255.255
E 240.0.0.0 to 247.255.255.255
An IP address is broken down into a network part and a host part.
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