ZyXEL Vantage CNM User Guide - Page 651
Configuring IP Addresses
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Appendix D IP Addresses and Subnetting Table 292 16-bit Network Number Subnet Planning (continued) NO. "BORROWED" HOST BITS SUBNET MASK NO. SUBNETS NO. HOSTS PER SUBNET 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 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 device. Once you have decided on the network number, pick an IP address for your device 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 device will compute the subnet mask automatically based on the IP address that you entered. You don't need to change the subnet mask computed by the device unless you are instructed to do otherwise. Vantage CNM User's Guide 651