ZyXEL Communications ZyXEL ZyWALL 2WE - Manual (Page 384)

ZyWALL 2 and ZyWALL 2WE
52 IP Subnetting
Chart K-13 Class B Subnet Planning
NO. “BORROWED” HOST BITS SUBNET MASK NO. SUBNETS NO. HOSTS PER SUBNET
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