Lantronix XPress-DR-IAP User's Guide Page 110

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UDP
8.4 IP Addresses
Each TCP/IP node on a network host has a unique IP address. This address provides the
information needed to forward packets on the local network and across multiple networks if
necessary.
IP addresses are specified as x.x.x.x, where each x is a number from 1 to 254; for example,
192.0.1.99. The Device Server must be assigned a unique IP address to use TCP/IP network
functionality.
IP addresses contain three pieces of information: the network, the subnet, and the host.
8.4.1 Network Portion
The network portion of the IP address is determined by the network type: Class A, B, or C.
Table 35 - Network Portion of IP Address
Network Class Network Portion of Address
Class A First byte (2nd, 3rd, and 4th bytes are the host)
Class B First 2 bytes (3rd and 4th bytes are the host)
Class C First 3 bytes (4th byte is the host)
In most network examples, the host portion of the address is set to zero.
Table 36 - Available IP Addresses
Clas
s
Reserved Available
127.0.0.0
191.255.0.
223.255.255.0 223.255.254.
224.0.0.0 to 255.2
A 0.0.0.0 1.0.0.0 to 126.0.0.0
B 128.0.0.0
0
128.1.0.0 to 191.254.0.0
C 192.0.0.0 192.0.1.0 to
0
D, E 55.255.254 None
255.255.255.255
Consider the IP address 36.1.3.4. This address is a Class A address; therefore, the network
portion of the address is 36.0.0.0 and the host portion is 1.3.4.
rmed when an IP network is broken down into smaller networks using a
subnet mask.
8.4.2 Subnet Portion
The subnet portion of the IP address represents which sub-network the address is from. Sub-
networks are fo
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