ABB FBIP-21 BACnet/IP User Manual page 31

No. Name/Value
09 Subnet CIDR
Dotted decimal
255.255.255.254
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
255.255.240.0
255.255.224.0
255.255.192.0
255.255.128.0
255.255.0.0
1...31
Description
Defines subnet masks for CIDR
notation.
Subnet masks are used for splitting
networks into smaller networks called
subnets. A subnet mask is a 32-bit
binary number that splits the IP
address into a network address and
host address.
Subnet masks are typically
represented in either dotted decimal
notation or the more compact CIDR
notation, as shown in the table below.
CIDR Dotted decimal
31 255.254.0.0
30 255.252.0.0
29 255.248.0.0
28 255.240.0.0
27 255.224.0.0
26 255.224.0.0
25 255.128.0.0
24 255.0.0.0
23 254.0.0.0
22 252.0.0.0
21 248.0.0.0
20 240.0.0.0
19 224.0.0.0
18 192.0.0.0
17 128.0.0.0
16
Subnet mask in CIDR notation
Start-up 31
Default
0
CIDR
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1