Lantronix Device Server UDS 10 - Manual (Page 53)

Configure
UDS-10 User Guide 3-13
3.5.3 Netmask: Number of Bits for Host Part
A netmask defines the number of bits taken from the IP address that are assigned for the host
section.
Note: Class A: 24 bits; Class B: 16 bits; Class C: 8 bits.
The unit prompts for the number of host bits to be entered, then calculates the netmask, which
is displayed in standard decimal-dot notation when the saved parameters are displayed (for
example, 255.255.255.0).
Table 4 - Standard IP Network Netmasks
Network Class Host Bits Netmask
A 24 255.0.0.0
B 16 255.255.0.0
C 8 255.255.255.0
Table 5 - Netmask Examples
Netmask Host Bits
255.255.255.252 2
255.255.255.248 3
255.255.255.240 4
255.255.255.224 5
255.255.255.192 6
255.255.255.128 7
255.255.255.0 8
255.255.254.0 9
255.255.252.0 10
255.255.248.0 11
... ...
255.128.0.0 23
255.0.0.0 24