IPv4 Range Expander

Given a start and an end IPv4 address, this tool finds the optimal CIDR representation for all valid IPv4 networks.

Input
Result
 old valuenew value
Start address
192.168.1.1
192.168.0.0
End address
192.168.6.255
192.168.7.255
Addresses in range
1,535
2,048
CIDR
192.168.0.0/21