Nortel Contivity 221 User Manual page 457

G-8 IP Subnetting
Chart G-13 Class B Subnet Planning
NO. "BORROWED" HOST BITS
12
13
14
15
317517-A Rev 00
SUBNET MASK NO. SUBNETS
255.255.255.240
(/28)
255.255.255.248
(/29)
255.255.255.252 16384
(/30)
255.255.255.254 32768
(/31)
NO. HOSTS PER SUBNET
4096 14
8192 6
2
1