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Table 158 class b subnet planning – ZyXEL Communications P-2608HWL-Dx Series User Manual

Page 386

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P-2608HWL-Dx Series User’s Guide

386

Appendix C IP Addresses and Subnetting

The following table is a summary for class “B” subnet planning.

Table 158 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

14

255.255.255.252 (/30)

16384

2

15

255.255.255.254 (/31)

32768

1

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