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This is the Terminal Network Calculator project ("termncalc")
This project is hosted by SourceForge.net. The project team describes it as:
A command which, for a given IP address and subnet mask, gives information about Network ID, broadcast address, first IP address, last IP address and network size. Examples using command: (ncalc 192.168.0.150 255.255.255.0) or (ncalc 192.168.0.150/24
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