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1. Subnetting
Nadira Islam
Department of Software Engineering
Daffodil International University

2. Sub netting
 Divide a big network into smaller
network
 FLSM-
 Dive big network into smaller network
containing fixed length

4. FLSM for Classful Addressing
195.20.25.1
Class: C
Subnet mask: 255.255.255.0
Network IP: 195.20.25.0
Broadcast IP: 195.20.25.255
Host’s IP’s:
195.20.25.1
195.20.25.2
195.20.25.3
.
.
195.20.25.253
195.20.25.254

5. Divide into two small network
195.20.25.0
11000011 00010100 00011001 00000000
Subnet 1:
Network IP:11000011 00010100 00011001 00000000
Subnet Mask:11111111 11111111 11111111 10000000
Broadcast IP:11000011 00010100 00011001 01111111
Host IP’s:11000011 00010100 00011001 00000001
11000011 00010100 00011001 00000010
11000011 00010100 00011001 00000011
…………………………..
11000011 00010100 00011001 01111101
11000011 00010100 00011001 01111110
Subnet 2:
Network IP:11000011 00010100 00011001 10000000
Subnet Mask:11111111 11111111 11111111 10000000
Broadcast IP:11000011 00010100 00011001 11111111
Host IP’s:11000011 00010100 00011001 10000001
11000011 00010100 00011001 10000010
11000011 00010100 00011001 10000011
…………………………..
11000011 00010100 00011001 11111101
11000011 00010100 00011001 11111110

6. FLSM for CIDR
193.10.0.0/20
11000001 00001010 00000000 00000000
Subnet mask: 11111111 11111111 11110000 00000000
Network IP: 11000001 00001010 00000000 00000000
193.10.0.0
Broadcast IP: 11000001 00001010 00001111 11111111
(193.10.15.255)
Host IP’s=
11000001 00001010 00000000 00000001
11000001 00001010 00000000 00000010
11000001 00001010 00000000 00000011
11000001 00001010 00000000 00000100
.
.
.
11000001 00001010 00001111 11111110

7. Divide the given Network into two network
Subnet 1:
Network IP: 11000001 00001010 00000000 00000000
Subnet mask: 11111111 11111111 11111000 00000000
Broadcast IP: 11000001 00001010 00000111 11111111
Host IP’s:
11000001 00001010 00000000 00000001
11000001 00001010 00000000 00000010
……………………………
11000001 00001010 00000111 11111110
Subnet2:
Network IP: 11000001 00001010 00001000 00000000
Subnet mask: 11111111 11111111 11111000 00000000
Broadcast IP: 11000001 00001010 00001111 11111111
Host IP’s:
11000001 00001010 00001000 00000001
11000001 00001010 00001000 00000010
……………………………
11000001 00001010 00001111 11111110

8. Exercise
1. 95.10.20.128/26, divide into two sub
network.
2. 198.168.2.0,divide into four sub
network.
3. If you have a network as
192.168.128.0, but in your office if
you need to create four different
networks which will server 10, 7, 8, 5
users in each. How you can do this ?