Advanced IP subnet calculator sipcalc

"Sipcalc is an advanced console-based IP subnet calculator. It can take multiple forms of input (IPv4/IPv6/interface/hostname) and output a multitude of information about a given subnet.

"On ubuntu, you can install it from software center or from the command line.

"If you want to calculate the netmask details of 123.123.123.123/28, here we go

"$ sipcalc 123.123.123.123/28 -[ipv4 : 123.123.123.123/28] - 0

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