3Com SuperStack 3 3250 Implementation Manual page 117

255.255.252.0
Supernet 1
Network 234.170.160.0
Binary
Equivalents
Netmask
255.255.252.0
1st Address
234.170.160.1
Last Address
234.170.163.254
Figure 37 Selecting a Range of Addresses
11111100
Netmask
Supernet Example
The four networks in
service provider (ISP). The ISP has decided to use supernetting to reduce
the size of the routing tables and improve throughput.
Figure 38 Supernet example
Supernet 2
234.170.164.0
10100000 10100100
11111100
255.255.252.0
234.170.164.1
234.170.167.254
Supernets 1 and 2 each require four Class C networks, so they require
a netmask with 2 zero bits (4 = 2
netmask of 255.255.252.0.
These zeros must be in the first address
255.255.252.0
First Address in Supernet
Figure 38 are all connected to the same Internet
Supernet 3
234.170.168.0
10101000
11111100 11111000
255.255.248.0
234.170.168.1
234.170.174.254
2
) in the third octet. This yields a
Supernetting 117
11111100
Supernet 4
234.170.175.0
10101111
11111111
255.255.255.0
234.170.175.1
234.170.175.254