$ ipcalc -c6 128.138.243.100
ipcalc: bad IPv6 address: 128.138.243.100
ipcalc -c6 fe80::a00:27ff:fe7a:3eb4/64
$ ipcalc -bmnp 128.138.243.100/26
NETMASK=255.255.255.192
PREFIX=26
BROADCAST=128.138.243.127
NETWORK=128.138.243.64
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