![]() ![]() If the test set is on a subnet, the Subnet Mask must be applied to determine the subnet address. If the test set's LAN IP Address is set to 130.29.183.121, as shown below, the first two bytes represent the network portion since this is a Class B address. Class D addresses are multicast, which are used when a datagram is directed to multiple hosts. For class B it is the first two bytes from the left, and for class C it is the first three bytes. ![]() For Class A addresses, the first byte from the left identifies the network. The IP address class defines which bytes contain the network portion of the address. The test set does not allow LAN IP Addresses in the range of 127.0.0.0 to 127.255.255.255 because these addresses are assigned for use as the Internet host loopback address. The network portion of the LAN IP Address depends on the address classification as shown below: LAN IP Address Classification This is referred to as a "dotted decimal" format. Each byte is in a decimal form separated from other bytes by a dot. IPv6 Address Requirements IPv4 Address RequirementsĪn IP Address (the IP address defaults for IPv4 address if there is no specified statements) consists of a 4-byte (32 bit) number. IP Address Requirements IP Address Requirements ![]()
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