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ZyXEL Communications ZyXEL ZyWALL 2WE User Manual

Page 384

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ZyWALL 2 and ZyWALL 2WE

52

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Subnetting

Chart K-13 Class B Subnet Planning

NO. “BORROWED” HOST BITS

SUBNET MASK

NO. SUBNETS

NO. HOSTS PER SUBNET

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

14 255.255.255.252

(/30)

16384 2

15 255.255.255.254

(/31)

32768 1