HP 500X HP JetDirect Print Servers 600N/400N/500X/300X Administrator's Guide - - Page 140

IP Address Structure and Class, shown in Table A.1

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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: Table A.1 IP Address Class Format Class A B C First Address Byte xxx. Network. Network. Network. Second Address Byte xxx. Host. Network. Network. Third Address Byte xxx. Host. Host. Network. Fourth Address Byte xxx Host Host Host Explained in more detail in the table "Network Class Characteristics," you will see how each network class differs further 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.2 Network Class Characteristics Class Leading Address Range Bit Identifier Maximum number of networks in the class A 0 0.0.0.0 to 126 127.255.255.255 B 10 C 110 128.0.0.0 to 191.255.255.255 192.0.0.0 to 223.255.255.255 16,382 Over 2 Million Maximum hosts in the network Over 16 Million 65,534 254 134 TCP/IP Overview EN

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134 TCP/IP Overview
EN
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:
Explained in more detail in the table “Network Class
Characteristics,” you will see how each network class differs further
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