Lantronix Guide to Configuring Netmask and Host Bits for UDS Network Cards

Configure

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

UDS-10 User Guide 3-13