Ip Subnet Mask - Lantronix CoBox-Micro User Manual

IP Addresses

IP Subnet Mask

An IP subnet mask divides IP address differently than the standards defined by the classes
A, B, and C. An IP subnet mask defines the number of bits to be taken from the IP address
as the network or host sections. The Device Server prompts for the number of host bits to
be entered and then calculates the netmask, which is displayed in standard decimal-dot
notation (for example, 255.255.255.0) when saved parameters are displayed.
Network Class
A
B
C
E-16
Table E-15: Standard IP Network Netmasks
Network Bits
8
16
24
Table E-16: Netmask Examples
Netmask
255.255.255.252
255.255.255.248
255.255.255.240
255.255.255.224
255.255.255.192
255.255.255.128
255.255.255.0
255.255.254.0
255.255.252.0
255.255.248.0
...
255.128.0.0
255.0.0.0
Supplemental Information
Host Bits Netmask
24 255.0.0.0
16 255.255.0.0
8 255.255.255.0
Host Bits
2
3
4
5
6
7
8
9
10
11
...
23
24