Presumably the idea is to give a little more info than the standard jodie's ipcalc which comes with your OS, and far better ipv6 support?
The examples don't make it clear what happens when you type "ipcalc 1.1.1.41/27", which I often do to find the top and bottom of a given /27 (or /29, or /26, etc). I'm not interested in typing
"ipcalc -pnmb --minaddr --maxaddr --geoinfo --addrspace"