Nortel 252 Configuration page 265

Table 63 Class B subnet planning
No. "Borrowed" Host Bits
5
6
7
8
9
10
11
12
13
14
15
Subnet Mask
255.255.248.0 (/21)
255.255.252.0 (/22)
255.255.254.0 (/23)
255.255.255.0 (/24)
255.255.255.128 (/25) 512
255.255.255.192 (/26) 1 024
255.255.255.224 (/27) 2 048
255.255.255.240 (/28) 4 096
255.255.255.248 (/29) 8 192
255.255.255.252 (/30) 16 384
255.255.255.254 (/31) 32 768
Nortel Business Secure Router 252 Configuration — Advanced
Appendix F IP subnetting 265
No. Subnets No. Hosts per Subnet
32 2 046
64 1 022
128 510
256 254
126
62
30
14
6
2
1