IP addresses are divided into five classes as below.
Class A: 0.0.0.0 - 188.8.131.52(Can work with a network of very large hosts.)
Class B: 184.108.40.206 - 220.127.116.11(Can work in medium sized networks)
Class C: 192.0.0.0 - 18.104.22.168(Used in small LANs)
Class D: 22.214.171.124 - 126.96.36.199(Used for multicasting)
Class E: 240.0.0.0 - 254.255.255.255(Reserved for experimental purpose)