Specifications

Chapter 1 Understanding Networking and IP Addressing
Networking using IP
Niagara Release 2.3
Niagara Networking & Connectivity Guide Revised: May 22, 2002
1–21
The following table gives a summary of how many hosts per subnet, and total subnets
result when a range of subnet masks are applied to networks of all classes.
Table 1-7 Subnetting for each class.
Class
Number of
Subnet Bits Subnet Mask
Number of
Subnets
Hosts per
Subnet
A
0 (not subnetted) 255.0.0.0 0 16,777,216
1 255.128.0.0 2 8,388,606
2 255.192.0.0 4 4,194,302
3 255.224.0.0 8 2,097,150
4 255.240.0.0 16 1,048,574
5 255.248.0.0 32 524,286
6 255.252.0.0 64 262,142
7 255.254.0.0 128 131,070
8 255.255.0.0 256 65,534
9 255.255.128.0 512 32,766
10 255.255.192.0 1,024 16,382
11 255.255.224.0 2,048 8,190
12 255.255.240.0 4,096 4,094
13 255.255.248.0 8,192 2,046
14 255.255.252.0 16,384 1,022
15 255.255.254.0 32,768 510
16 255.255.255.0 65,536 254
17 255.255.255.128 131,072 126
18 255.255.255.192 262,144 62
19 255.255.255.224 524,288 30
20 255.255.255.240 1,048,576 14
21 255.255.255.248 2,097,152 6
22 255.255.255.252 4,194,304 2
B
0 (not subnetted) 255.255.0.0 0 65,534
2 255.255.192.0 4 16,382
3 255.255.224.0 8 8,190
4 255.255.240.0 16 4,094
5 255.255.248.0 32 2,046
6 255.255.252.0 64 1,022
7 255.255.254.0 128 510
8 255.255.255.0 256 254
9 255.255.255.128 512 126
10 255.255.255.192 1024 62
11 255.255.255.224 2048 30
12 255.255.255.240 4096 14
13 255.255.255.248 8192 6
14 255.255.255.252 16384 2