User's Manual

SPEEDLAN 4100 & 4200 Installation and Operation User Guide
7-4 Setting Up the IP Addresses (IP Host Setup)
• Class C addresses use 24 bits (3 octets) for the network portion and 8 bits (two octets) for
the node (or host) section of the address. This provides 16.7 million networks with 256
nodes for each network.
• First three bytes are assigned as network address
• Remaining byte used for node address
• Format: network, network, network, node
• In IP address 198.21.74.102, "198.21.74" is the network address, and "102" is the
node address
• Maximum of 28 or 254 node addresses
• Class D
• Range is 224.0.0.0 to 239.255.255.255
• Used for multicast packets (i.e., host sends out router discovery packets to learn all of
the routers on the network)
• Class E
• Range is 240.0.0.0 to 255.255.255.255
• Reserved for future use
Note: Class D & E should NOT be assigned to net assignment of IP addresses. In addition,
the first octet, 127, is reserved. In each network definition, the first node number (i.e.,
"0") is used to define the network, as well as the last number (i.e., "255"). The last
number is known as the broadcast address.
Public IP addresses can be obtained from the following address:
Network Solutions
InterNIC Registration Services
505 Huntmar Park Drive
Herndon, VA 22070
[e-mail]
Note: Non-public addresses can include a network address assigned from the network
administrator or from the IP provider. Also, there is one network in each class that is
defined for private use, allowing the creation of internal networks. These addresses are
Class A: 10.0.0.0, Class B: 172.10.0.0, and Class C: 192.168.0.0.