code: def in6_getLocalUniquePrefix():
      
      # Extracted from RFC 1305 (NTP) :
      # NTP timestamps are represented as a 64-bit unsigned fixed-point number,
      # in seconds relative to 0h on 1 January 1900. The integer part is in the
      # first 32 bits and the fraction part in the last 32 bits.
  
      # epoch = (1900, 1, 1, 0, 0, 0, 5, 1, 0)
      # x = time.time()
      # from time import gmtime, strftime, gmtime, mktime
      # delta = mktime(gmtime(0)) - mktime(self.epoch)
      # x = x-delta
  
      tod = time.time()  # time of day. Will bother with epoch later
      i = int(tod)
      j = int((tod - i) * (2**32))
      tod = struct.pack("!II", i, j)
      mac = RandMAC()
      # construct modified EUI-64 ID
      eui64 = inet_pton(socket.AF_INET6, '::' + in6_mactoifaceid(mac))[8:]
      import hashlib
      globalid = hashlib.sha1(tod + eui64).digest()[:5]
      return inet_ntop(socket.AF_INET6, b'\xfd' + globalid + b'\x00' * 10)
docs: Returns a pseudo-randomly generated Local Unique prefix. Function
      follows recommendation of Section 3.2.2 of RFC 4193 for prefix
      generation.