Lantronix 10 User Manual

UDP 

 

8-14

UDS-10 User Guide

 

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. 

The network portion of the IP address is determined by the network type: Class A, B, or C. 

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. 

A 0.0.0.0 

127.0.0.0 

1.0.0.0 to 126.0.0.0 

B 128.0.0.0 

191.255.0.0 

128.1.0.0 to 191.254.0.0 

C 192.0.0.0 

223.255.255.0 

192.0.1.0 to 223.255.254.0 

D, E 

224.0.0.0 to 255.255.255.254 
255.255.255.255 

None (Check this) 

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. 

The subnet portion of the IP address represents which sub-network the address is from. Sub-
networks are formed when an IP network is broken down into smaller networks using a 
subnet mask.