Networking Contd…

• The cidr (Classless Interdomain routing) Expansion

cidr: 172.0.0.0/12
sm:   11111111.11110000.00000000.00000000
range: 172.0.0.0 to 172.15.255.255

cidr: 172.16.0.0/12
sm:   11111111.11110000.00000000.00000000
range: 172.y.0.0 to 172.y.0.0
16 =>   0001xxxx
min =>  00010000 => 16
max =>  00011111 => 31

range: 172.16.0.0 to 172.31.255.255


cidr: 192.168.48.0/22
SM: 11111111.11111111.11111100.00000000
range 192.168.y.0 to 192.168.y.255
48 => 001100xx
min =>00110000 => 48
max => 00110011 => 51
192.168.48.0 to 192.168.51.255

cidr: 10.10.0.0/15
sm: 11111111.11111110.00000000.00000000
range: 10.y.0.0 to 10.y.255.255
10 => 0000101x
min => 00001010
max => 00001011 => 11
10.10.0.0 to 10.11.255.255

• The private cidr ranges are

10.0.0.0/8 => 10.0.0.0 to 10.255.255.255
172.16.0.0/12 => 172.16.0.0 to 172.31.255.255
192.168.0.0/16 => 192.168.0.0 to 192.168.255.255

• Are the following ranges private?

192.168.10.0/24 => 192.168.10.0 to 192.168.10.255 (Yes)
192.168.0.0/15 => 192.168.0.0 to 192.169.255.255 (No)
10.0.0.0/7 => 10.0.0.0 to 11.255.255.255 (No)


10.10.0.0/16
10.10.0.0/18

NAT (Network Address Translation)