Given an assignable IP address range from 1524721 152479254

Given an assignable IP address range from 152.4.72.1 – 152.4.79.254, what is the CIDR address?

Solution

CIDR is used in the case of variable length subnet mask. CIDR is the reverse of subnetting.

CIDR Range:   152.4.72.0/21          10011000.00000100.01001000.00000000

Netmask:        255.255.248.0                            11111111.11111111.11111000.00000000

Wildcard Bits: 0.0.7.255                              00000000.00000000.00000111.11111111

Network:   152.4.72.0/21                               10011000.00000100.01001 000.00000000

Broadcast: 152.4.79.255          10011000.00000100.01001 111.11111111

HostMin:   152.4.72.1            10011000.00000100.01001 000.00000001

HostMax:   152.4.79.254          10011000.00000100.01001 111.11111110

Hosts/Net: 2046                 

Thus, the CIDR address is 152.4.72.0/21 where IP address is 152.4.72.0 and it has 21 as the subnet mask.