Appendix C IP Addresses and Subnetting
User’s Guide 231
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 NBG4115.
Once you have decided on the network number, pick an IP address for your
NBG4115 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
NBG4115 will compute the subnet mask automatically based on the IP address

Table 80 16-bit Network Number Subnet Planning

NO. “BORROWED”
HOST BITS SUBNET MASK NO. SUBNETS NO. HOSTS PER
SUBNET
1255.255.128.0 (/17) 232766
2255.255.192.0 (/18) 416382
3255.255.224.0 (/19) 88190
4255.255.240.0 (/20) 16 4094
5255.255.248.0 (/21) 32 2046
6255.255.252.0 (/22) 64 1022
7255.255.254.0 (/23) 128 510
8255.255.255.0 (/24) 256 254
9255.255.255.128 (/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