ABB FBIP-21 BACnet/IP User Manual page 25

No. Name/Value Description
09 Subnet CIDR 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.
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 Subnet mask in CIDR notation
10 GW address 1 Defines the four octets of the gateway address. IP gateways connect
individual physical IP subnets into a unified IP network.
An IP node on one subnet communicates with an IP node on another
subnet by sending data to the IP gateway for forwarding. Parameters
10...13 define the four octets of the gateway address.
0...255 GW address
... ... ...
13 GW address 4 See parameter 10 GW address 1.
0...255 GW address
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
Start-up 25
Default
0
CIDR
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
12
0
...
0