Subnetting With Class A And Class B Networks; Table 59 Class C Subnet Planning; Table 60 Class B Subnet Planning - Nortel BCM50e Configuration

240 Appendix G IP subnetting
Table 58 Eight subnets
Subnet Subnet Address
7 192
8 224
Table 59

Table 59 Class C subnet planning

No. Borrowed Host Bits
1
2
3
4
5
6
7

Subnetting with Class A and Class B networks.

For class A and class B addresses the subnet mask also determines which bits are
part of the network number and which are part of the host ID.
A class B address has two host ID octets available for subnetting and a class A
address has three host ID octets (see
Table 60

Table 60 Class B subnet planning

No. "Borrowed" Host Bits
1
2
3
4
N0115789
First Address
193
225
is a summary for class C subnet planning.
Subnet Mask
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
255.255.255.248 (/29)
255.255.255.252 (/30)
255.255.255.254 (/31)
is a summary for class B subnet planning.
Subnet Mask
255.255.128.0 (/17)
255.255.192.0 (/18)
255.255.224.0 (/19)
255.255.240.0 (/20)
Last Address Broadcast Address
222 223
254 255
No. Subnets No. Hosts per Subnet
2 126
4 62
8 30
16 14
32 6
64 2
128 1
Table 48) available for subnetting.
No. Subnets No. Hosts per Subnet
2 32 766
4 16 382
8 8 190
16 4 094