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    I feel like this blog post is missing some final advice. I strongly recommend to use just only things that pass as LDH labels (RFC 5890 § 2.3.1) or, a valid, that is transformable to an A label (RFC 5890 § 2.3.2.1), internationalized domain label, as host-, machine-, or system-names.

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      I’ve always found the dns-oarc folks and specifically their mailing lists and workshops to be extremely educational. Truly a source of knowledge.