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B-8 IP Subnetting
The following table is a summary for class "B" subnet planning.
Chart B-13 Class B Subnet Planning
NO. "BORROWED" HOST BITS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
317516-A Rev 00
SUBNET MASK
NO. SUBNETS
255.255.128.0 (/17)
255.255.192.0 (/18)
255.255.224.0 (/19)
255.255.240.0 (/20)
255.255.248.0 (/21)
255.255.252.0 (/22)
255.255.254.0 (/23)
128
255.255.255.0 (/24)
256
255.255.255.128
512
(/25)
255.255.255.192
1024
(/26)
255.255.255.224
2048
(/27)
255.255.255.240
4096
(/28)
255.255.255.248
8192
(/29)
255.255.255.252
16384
(/30)
255.255.255.254
32768
(/31)
NO. HOSTS PER SUBNET
2
32766
4
16382
8
8190
16
4094
32
2046
64
1022
510
254
126
62
30
14
6
2
1
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