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IP Addressing By: Sushant Kumar www.sushantkumar.wordpress.com
Introduction Also called Internet address Unique 32 Bit
Address Space Total addresses used by protocol IPv4 : 2 32 Address space: more than 4 billion (theoretically)
Notation Binary 01110001.01110001.01110001.01110001 Dotted Decimal 126.96.36.199 Hexadecimal 0x810b0bef or 810b0bef
Classful Addressing Initially IP addresses used the concept of classes In mi 1990s new architecture came: Classless addressing Classless addressing will eventually supercede
Address per class ClassAddress space Percentage A½50% B¼25% C1/812.5% D1/166.25% E1/166.25%
Recognizing classes 1 st byte2 nd byte3 rd byte4 th byte Class A0 Class B10 Class C110 Class D1110 Class E1111
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
NetID & HostID A, B & C are divided into netid & hostid D & E are not divided
NetID & HostID Byte 1Byte 2Byte 3Byte 4 Class ANetidHostid Class BNetidHostid Class CNetidHostid Class DMulticast Address Class EReserved for future use
Class A 188.8.131.52 to 184.108.40.206 3 netids are reserved 1 255 10(private addressing)
More points Most class B addresses are wasted The no: of addresses in class C is smaller than the needs of most organizations
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