ZyXEL Communications VMG1312-B Series - Page 325

Appendix B IP Addresses and Subnetting
VMG1312-B Series User’s Guide
325
Subnet Planning
The following t able is a sum m ary for subnet planning on a network with a 24- bit net work num ber.
The following t able is a sum m ary for subnet planning on a network with a 16- bit net work num ber.
3 64 65 94 95
4 96 97 126 127
5 128 129 158 159
6 160 161 190 191
7 192 193 222 223
8 224 225 254 255
Table 119 Eight Subnets (cont inued)
SUBNET
SUBNET
ADDRESS
FIRST ADDRESS
LAST
ADDRESS
BROADCAST
ADDRESS
Table 120 24- bit Net work Num ber Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK NO. SUBNETS
NO. HOSTS PER
SUBNET
1 255.255.255.128 ( / 25) 2 126
2 255.255.255.192 ( / 26) 4 62
3 255.255.255.224 ( / 27) 8 30
4 255.255.255.240 ( / 28) 16 14
5 255.255.255.248 ( / 29) 32 6
6 255.255.255.252 ( / 30) 64 2
7 255.255.255.254 ( / 31) 128 1
Table 121 16- bit Net work Num ber 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