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Routing IP and IPX
A-13
IP Addresses
TCP/IP Numbering and subnet masking IP numbers or
addresses
are
normally made up of four fields (normally called
bytes
), with each byte
having a whole number value of between 0 and 255, and the bytes
separated by a full stop. For example:
123.123.123.123
An IP address is divided into two sections, one is the
Network Address
section and the other is the
Host
Address
section. For example:
123.123.|123.123
Network Host
The divider | between the two sections is moveable according to what
class
of IP address it is. The class of address is defined by what the
number is in the first address byte:
■
For a Class A IP address the number in the first byte will be in the range
00 to 126
■
For a Class B IP address the numbers in the first & second bytes will be
in the range 128.001 to 191.254
■
For a Class C IP address the numbers in the first, second & third bytes
will be in the range 192.000.001 to 223.255.254
For example:
Class A 1.|123.123.123
Network Host
Class B 128.001.|123.123
Network Host
Class C 192.123.123.|123
Network Host