Appendix B IP Addresses and Subnetting

The following table is a summary for subnet planning on a network with a 16-bit network number.

16-bit Network Number Subnet Planning

NO. “BORROWED”

SUBNET MASK

NO.

NO. HOSTS

HOST BITS

 

SUBNETS

PER SUBNET

1

255.255.255.0 (/17)

2

32766

2

255.255.255.0 (/18)

4

16382

3

255.255.255.0 (/19)

8

8190

4

255.255.255.0 (/20)

16

4094

5

255.255.255.0 (/21)

32

2046

6

255.255.255.0 (/22)

64

1022

7

255.255.255.0 (/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

Configuring IP Addresses

Where you obtain your network number depends on your particular situation. If the ISP or your network administrator assigns you a block of registered IP addresses, follow their instructions in selecting the IP addresses and the subnet mask.

If the ISP did not explicitly give you an IP network number, then most likely you have a single user account and the ISP will assign you a dynamic IP address when the connection is established. If this is the case, it is recommended that you select a network number from 192.168.0.0 to 192.168.255.0. The Internet Assigned Number Authority (IANA) reserved this block of addresses specifically for private use; please do not use any other number unless you are told otherwise. You must also enable Network Address Translation (NAT) on the FSG1100HN.

Once you have decided on the network number, pick an IP address for your FSG1100HN that is easy to remember (for instance, 192.168.1.254) but make sure that no other device on your network is using that IP address.

The subnet mask specifies the network number portion of an IP address. Your FSG1100HN will compute the subnet mask automatically based on the IP

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FSG1100HN User’s Guide

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ZyXEL Communications wireless active fiber router manual Configuring IP Addresses, 122

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