HP J7949E Manuel d'utilisateur télécharger pdf (Page 208)

NWW TCP/IP Overview 208

IP Address Structure and Class

An IP address is comprised of 32 bits of information and divided

into 4 sections containing 1 byte each section or 4 bytes total:

xxx.xxx.xxx.xxx

For efficiency in routing, networks were broken down into three

classes, so routing can begin simply by identifying the leading

byte of information in the IP address. The three IP addresses

that InterNIC assigns are class A, B, and C. The network class

determines what each of the four IP address sections identify as

shown in Table A.1

As illustrated in Table A.2

, each network class differs by the leading

bit identifier, the address range, the number of each type available,

and the maximum number of hosts each class allows.

Table A.1 IP Address Class Format

Class First Address

Byte xxx.

Second

Address

Byte xxx.

Third Address

Byte xxx.

Fourth

Address

Byte xxx

A Network. Host. Host. Host

B Network. Network. Host. Host

C Network. Network. Network. Host

Table A.2 Network Class Characteristics

Class Leading

Bit

Identifier

Address Range Maximum

Number of

Networks in the

Class

Maximum

Hosts in the

Network

A 0 0.0.0.0 to

127.255.255.255

126 Over 16 Million

B 10 128.0.0.0 to

191.255.255.255

16,382 65,534

C 110 192.0.0.0 to

223.255.255.255

Over 2 Million 254

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 231 232

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HP J7949E Manuel d'utilisateur Page 208

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