QMS 2060 User Manual page 244

last 24 bits form the host address. The high order bits also constitute
the network mask for the Class A address.
The following table identifies the differences between Class A, B, and
C addresses.
Class Uses
A Sites with few
networks and
many hosts
B Sites with some
networks and
some hosts
C Sites with many
networks and
few hosts
L
Highest Network
Order Address
Bits Size
(Binary)
0 7 bits
10 14 bits
110 21 bits
Host Network Mask
Address (Hex)
Size
24 bits 0xFF000000
16 bits 0xFFFF0000
8 bits 0xFFFFFF00