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This value is limited to 64 chars as per x.520 .
Now the longest out of user's control should be:
  >>> len('Caucase CAU at [aaaa:aaaa:aaaa:aaaa:aaaa:aaaa:aaaa:aaaa]:65535')
  62
Note: it could be exceeded if the user provides a longer hostname as
--netloc argument.