ZyXEL Communications Dimension ES-2008, User Manual

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Dimension ES-2008 Ethernet Switch
R IP Subnetting
Chart 12 Class C Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK NO.
SUBNETS
NO. HOSTS PER
SUBNET
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 1 ) available for subnetting.
The following table is a summary for class “B” subnet planning.
Chart 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
11 255.255.255.224 (/27) 2048 30
12 255.255.255.240 (/28) 4096 14
13 255.255.255.248 (/29) 8192 6