Novell NETWARE 6-DOCUMENTATION Manual page 1432

Figure 6 A Class A IP address
1 Byte
Network
0
Address
Class B Addresses
Figure 7 A Class B IP address
2 Bytes
Network
10
Address
Class C Addresses
3 Bytes
Host Portion
A Class B IP address consists of a 2-byte network portion followed by a 2-byte
host portion, as shown in
portion are always set to 10. Thus, within a single internetwork there can be
approximately 16,000 Class B networks (128.0 through 191.255), with more
than 65,000 nodes in each.
The format of a Class B address is as follows:
10nnnnnn.nnnnnnnn.hhhhhhhh.hhhhhhhh
where n represents the network address and h represents the host address.
Class B addresses contain 14 bits of network address and 16 bits of host
address.
2 Bytes
Host Portion
A Class C IP address consists of a 3-byte network portion followed by a 1-byte
host portion, as shown in
the network portion are always set to 110. Within a single internetwork, there
can be approximately 2 million Class C networks (192.0.0 through
223.255.255), with up to 254 nodes in each.
Figure 7. The two highest-order bits of the network
Figure 8 on page 24. The three highest-order bits of
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Understanding