• IP address is 32 bit in (IPV4) IP address divided into 5 classes

class A IP address ,24 bit is host ID and 8 bit network ID (255 indicated network ID) class B IP address, 16bit is host ID and 16 bit network ID class C IP address ,8 bit is host ID and 24 bit network ID class D use for R&D purpose Class E use for multicasting purpose in class A 2^24 Host are connected class B 2^16 Host are connected class C 2^8 Host are connected