ZyXEL G-405 User Guide - Page 91

Chart 8-12 Class C Subnet Planning, Subnetting With Class A and Class B Networks.

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ZyAIR G-405 User's Guide Chart 8-12 Class C Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK NO. SUBNETS 3 255.255.255.224 (/27) 8 4 255.255.255.240 (/28) 16 5 255.255.255.248 (/29) 32 6 255.255.255.252 (/30) 64 7 255.255.255.254 (/31) 128 NO. HOSTS PER SUBNET 30 14 6 2 1 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 (see Chart 8-1) available for subnetting. The following table is a summary for class "B" subnet planning. Chart 8-13 Class B Subnet Planning NO. "BORROWED" HOST BITS 1 2 3 4 5 6 7 8 9 10 SUBNET MASK 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) 255.255.255.128 (/25) 255.255.255.192 (/26) NO. SUBNETS 2 4 8 16 32 64 128 256 512 1024 NO. HOSTS PER SUBNET 32766 16382 8190 4094 2046 1022 510 254 126 62 IP Subnetting Q

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ZyAIR G-405 User’s Guide
IP Subnetting
Q
Chart 8-12 Class C Subnet Planning
NO. “BORROWED” HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER
SUBNET
3
255.255.255.224 (/27)
8
30
4
255.255.255.240 (/28)
16
14
5
255.255.255.248 (/29)
32
6
6
255.255.255.252 (/30)
64
2
7
255.255.255.254 (/31)
128
1
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 (see
Chart 8-1
) available for subnetting.
The following table is a summary for class “B” subnet planning.
Chart 8-13 Class B Subnet Planning
NO. “BORROWED” HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER SUBNET
1
255.255.128.0 (/17)
2
32766
2
255.255.192.0 (/18)
4
16382
3
255.255.224.0 (/19)
8
8190
4
255.255.240.0 (/20)
16
4094
5
255.255.248.0 (/21)
32
2046
6
255.255.252.0 (/22)
64
1022
7
255.255.254.0 (/23)
128
510
8
255.255.255.0 (/24)
256
254
9
255.255.255.128
(/25)
512
126
10
255.255.255.192
(/26)
1024
62