ZyXEL Communications FSG1100HN User Manual page 122

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"
HOST BITS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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
122
SUBNET MASK
255.255.255.0 (/17)
255.255.255.0 (/18)
255.255.255.0 (/19)
255.255.255.0 (/20)
255.255.255.0 (/21)
255.255.255.0 (/22)
255.255.255.0 (/23)
255.255.255.0 (/24)
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
255.255.255.248 (/29)
255.255.255.252 (/30)
255.255.255.254 (/31)
NO. NO. HOSTS
SUBNETS PER SUBNET
2 32766
4 16382
8 8190
16 4094
32 2046
64 1022
128 510
256 254
512 126
1024 62
2048 30
4096 14
8192 6
16384 2
32768 1
FSG1100HN User's Guide