[fix] Check against full fc00::/7 ipv6 private space #52
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My understanding from reading rfc4193 is that IPv6 private space is fc00::/7
That would be FC00:0000:0000:0000:0000:0000:0000:0000 - FDFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
See: https://tools.ietf.org/html/rfc4193#section-3