User's Manual

SPEEDLAN 9200 User Guide Part # 34357-MNL Rev.03
5-3
This specification simplifies the way routers handle the messages (packets) and speed
up the forwarding process.
In fact, IP defines five classes:
•
Class A addresses uses 1 octet for the network portion and 3 octets for the
node (or host) section of the address. This provides up to 128 networks with
16.7 million nodes for each network.
• First octet is assigned as network address
• Remaining octets used for node addresses
• Format: network, node, node, node
• In IP address 49.22.102.70, "49" is network address and "22.102.70" is
the node address—all machines on this network have the "49" network
address assigned to them
• Maximum of 16,777,216 node addresses
• Class B addresses uses 2 octets for the network portion and 2 octets for the
node (or host) section of the address. This provides up to 16,384
networks with 64,534 nodes for each network.
• First 2 octets are assigned as network address
• Remaining octets used for node addresses
• Format: network, network, node, node
• In IP address 130.57.30.56, "130.57" is the network address, and
"30.56" is the node address
• Maximum of 65,534 node addresses
• Class C addresses use 3 octets for the network portion and 1 octet for the
node (or host) section of the address. This provides 16.7 million networks with
256 nodes for each network.
• First three octets are assigned as network address
• Remaining octet used for node address
• Format: network, network, network, node
• In IP address 192.0.2.102, "192.0.2" is the network address, and "102" is
the node address
• Maximum of 28 or 254 node addresses