IPv6 Subnet Tips
/112
/ Last Nibble
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/96
/ Last Two Nibbles
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/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
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