Specifications

Installation and Operation Manual Appendix C Operating Environment
FCD-E1LC Ver. 1.0 IP Environment C-7
IP Address Structure
An IP address is a 32-bit number, represented as four 8-bit bytes. Each byte
represents a decimal number in the range of 0 through 255.
The address is written in decimal format, with the bytes separated by decimal
points, e.g., 164.90.70.47. This format is called
dotted quad notation .
An IP address is logically divided into two main portions:
• Network portion
• Host portion.
Network Portion
In general, the network portion is assigned by the Internet Assigned Numbers
Authority (IANA), and its main purpose is to identify a specific IP network. For
exceptions, see the
Global vs. Private IP Addresses section below.
There are five IP address classes: A, B, C, D, and E. However, only the A, B and C
classes are used for IP addressing. Consult your network manager with respect to
the class of IP addresses used on your network.
The network portion of an IP address can be one, two, or three bytes long, in
accordance with the IP address class. This arrangement is illustrated below:
IP Address
Byte 1 Byte 2 Byte 3 Byte 4
Class A Network Portion Host Portion
Class B Network Portion Host Portion
Class C Network Portion Host Portion
The class of each IP address can be determined from its leftmost byte, in
accordance with the following chart:
Address Class First Byte Address Range
Class A
0 through 127 0.H.H.H through 127.H.H.H
Class B
128 through 191 128.N.H.H through 191.N.H.H
Class C
192 through 223 192.N.N.H through 223.N.N.H
where:
N – indicates bytes that are part of the network portion
H – indicates bytes that are part of the host portion.