For this certain ip addresses are reserved. 192.168.0.0/16
172.16.0.0/12
10.0.0.0/8
CIDR (Classless Inter Domain Routing):
172.0.0.0/16
SM: 11111111.11111111.00000000.00000000
ip range=> 172.0.0.0 to 172.0.255.255
10.10.10.0/24
SM: 11111111.11111111.11111111.00000000
ip range => 10.10.10.0 to 10.10.10.255
172.16.0.0/12
SM: 11111111.11110000.00000000.00000000
ip range: 172.y.0.0 to 172.y.255.255
16 => 0001xxxx
min => 00010000 => 16
max => 00011111 => 31
ip range: 172.16.0.0 to 172.31.255.255
192.168.10.0/23
SM: 11111111.11111111.11111110.00000000
ip range: 192.168.y.0 to 192.168.y.255
10 => 0000101x
min => 00001010 => 10
max => 00001011 => 11
ip range: 192.168.10.0 to 192.168.11.255
Lets expand some cidr ranges
192.168.128.0/21
SM: 11111111.11111111.11111000.00000000
ip range: 192.168.y.0 to 192.168.y.255
128 => 10000xxx
min => 10000000 => 128
max => 10000111 => 135
192.168.128.0 to 192.168.135.255
10.240.0.0/15
SM: 11111111.11111110.00000000.00000000
ip range: 10.y.0.0 to 10.y.255.255
240 => 1111000x
min => 11110000 => 240
max => 11110001 => 241
ip range : 10.240.0.0 to 10.241.255.255
Which is the bigger network
10.10.10.0/24 => N = 24 n => 32-24 => 8 size => 2^8 or 10.10.10.0/23 => N = 23, n = 32-23 = 9, size => 2^9 (10.10.10.0/23 is bigger network)
192.168.0.0/24 vs 192.168.0.0/16 => 192.168.0.0/16 is bigger network
Private Network ranges
192.168.0.0/16 => 192.168.0.0 to 192.168.255.255
172.16.0.0/12 => 172.16.0.0 to 172.31.255.255
10.0.0.0/8 => 10.0.0.0 to 10.255.255.255
Are the following networks private
192.168.0.0/15 => 192.168.0.0 to 192.169.255.255 => This is not private range
10.10.0.0/15 => 10.10.0.0 to 10.11.255.255 => this is a private range
172.16.0.0/14 => this is private
