ZyXEL Communications Vantage CNM 2.0 User Manual page 229

1 0
2 32
3 64
4 96
5 128
6 160
7 192
8 224
The following table is a summary for class "C" subnet planning.
NO. "BORROWED" HOST BITS
1
2
3
4
5
6
7
Subnetting With Class A and Class B Networks.
For class "A" and class "B" addresses the subnet mask also determines which bits are part of the network
number and which are part of the host ID.
A class "B" address has two host ID octets available for subnetting and a class "A" address has three host ID
octets available for subnetting.
The following table is a summary for class "B" subnet planning.
NO. "BORROWED" HOST BITS
1
2
3
4
5
6
7
8
IP Subnetting
1
33
65
97
129
161
193
223
Class C Subnet Planning
SUBNET MASK NO. SUBNETS
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
255.255.255.248 (/29)
255.255.255.252 (/30)
255.255.255.254 (/31)
Class B Subnet Planning
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)
255.255.255.0 (/24)
30
62
94
126
158
190
222
254
NO. HOSTS PER SUBNET
2
4
8
16
32
64
128
NO. HOSTS PER SUBNET
2 32766
4 16382
8 8190
16 4094
32 2046
64 1022
128
256
Vantage CNM 2.0
31
63
95
127
159
191
223
255
126
62
30
14
6
2
1
510
254
S