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IPv4 range expander

Given a start and an end IPv4 address this tool calculates a valid IPv4 network with its CIDR notation.

Start address

End address

	old value	new 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

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