What is an IP address ?

As we know every telephone has its unique telephone address on the telephone network (eg: 2845****) , likewise each and every computer in the computer network is identified and located uniquely by its IP address. The IP address is 32 bits in length. We express the IP address in dotted decimal system. IP address is divided into 4 octets in dotted decimal system. An octet has 8 bits. Each and every octet is converted into decimal separated by a dot (eg: 192.168.1.1).


IP Address = Network ID + Host ID
Telephone  = Areacode + Tel.Number


CLASS:-


A = First octet is Network ID + Three Host ID.
B = First two octets are Network ID + Two Host ID.
C= First three octets are Network ID + One Host ID.
D= These are reserved forMulticasting.
E= Reserved for Research