1. IP Addressing By: Sushant Kumar www.sushantkumar.wordpress.com

2. Introduction Also called Internet address Unique 32 Bit

3. Address Space Total addresses used by protocol IPv4 : 2 32 Address space: more than 4 billion (theoretically)

4. Notation Binary 01110001.01110001.01110001.01110001 Dotted Decimal 128.11.3.31 Hexadecimal 0x810b0bef or 810b0bef

5. Classful Addressing Initially IP addresses used the concept of classes In mi 1990s new architecture came: Classless addressing Classless addressing will eventually supercede

6. Address per class ClassAddress space Percentage A½50% B¼25% C1/812.5% D1/166.25% E1/166.25%

7. Recognizing classes 1 st byte2 nd byte3 rd byte4 th byte Class A0 Class B10 Class C110 Class D1110 Class E1111

8. Recognizing classes (decimal notation) 1 st byte2 nd byte3 rd byte4 th byte Class A0 to 127 Class B128 to 191 Class C192 to 223 Class D224 to 239 Class E240 to 255

9. NetID & HostID A, B & C are divided into netid & hostid D & E are not divided

10. NetID & HostID Byte 1Byte 2Byte 3Byte 4 Class ANetidHostid Class BNetidHostid Class CNetidHostid Class DMulticast Address Class EReserved for future use

11. Class A 1.0.0.0 to 1.255.255.255 3 netids are reserved 1 255 10(private addressing)

12. More points Most class B addresses are wasted The no: of addresses in class C is smaller than the needs of most organizations