ZyXEL NBG-460N User Guide - Page 323

Configuring IP Addresses

Page 323 highlights

Appendix B IP Addresses and Subnetting The following table is a summary for subnet planning on a network with a 16-bit network number. Table 129 16-bit Network Number Subnet Planning NO. "BORROWED" HOST BITS SUBNET MASK NO. SUBNETS 1 255.255.128.0 (/17) 2 2 255.255.192.0 (/18) 4 3 255.255.224.0 (/19) 8 4 255.255.240.0 (/20) 16 5 255.255.248.0 (/21) 32 6 255.255.252.0 (/22) 64 7 255.255.254.0 (/23) 128 8 255.255.255.0 (/24) 256 9 255.255.255.128 (/25) 512 10 255.255.255.192 (/26) 1024 11 255.255.255.224 (/27) 2048 12 255.255.255.240 (/28) 4096 13 255.255.255.248 (/29) 8192 14 255.255.255.252 (/30) 16384 15 255.255.255.254 (/31) 32768 NO. HOSTS PER SUBNET 32766 16382 8190 4094 2046 1022 510 254 126 62 30 14 6 2 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 NBG-460N. Once you have decided on the network number, pick an IP address for your NBG460N that is easy to remember (for instance, 192.168.1.1) 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 NBG-460N will compute the subnet mask automatically based on the IP address NBG-460N User's Guide 323

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Appendix B IP Addresses and Subnetting
NBG-460N User’s Guide
323
The following table is a summary for subnet planning on a network with a 16-bit
network number.
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 NBG-460N.
Once you have decided on the network number, pick an IP address for your NBG-
460N that is easy to remember (for instance, 192.168.1.1) 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
NBG-460N will compute the subnet mask automatically based on the IP address
Table 129
16-bit Network Number 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