IPv6 Subnet Tips
/112 / Last Nibble
fc00:0000:0000:0000:0000:0000:xxxx
/96 / Last Two Nibbles
fc00:0000:0000:0000:0000:xxxx:xxxx
/80 / Last Three Nibbles
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/64 / Half the Nibbles
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/48 / But first 3 Nibbles
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/32 / But first 2 Nibbles
fc00:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
/16 / But first Nibble
fc00:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
/0 / The whole shebang
fc00::xxxx:xxxx:xxxx:xxxx