The IETF/IAB maintains a liaison relationship with the Unicode Consortium, the organization responsible for the Unicode Standard and related specifications. The liaison covers areas where Unicode's character encoding work intersects with IETF protocols, most prominently Internationalized Domain Names (IDN).
To reach the IETF/IAB liaison to the Unicode Consortium, or to ask questions about the IDNA specifications and their relationship to Unicode, send email to Patrik Fältström <paf@netnod.se>. Patrik is also a co-author of for example RFC 8753 and the maintainer of the createtables tooling described below.
These documents defined the original IDNA (2003) protocol and have been superseded by the IDNA 2008 suite above:
IANA maintains derived property tables specifying which Unicode code points are PVALID, DISALLOWED, CONTEXTO, CONTEXTJ, or UNASSIGNED for use in domain names, as defined by RFC 5892 (updated by RFC 6452 and RFC 8753).
Discussion of IDNA updates and reviews for new Unicode versions takes place on the idna-update@ietf.org mailing list.
The createtables repository (maintained by Netnod) implements the RFC 5892 algorithm to generate IDNA derived property tables for each Unicode version. It fetches Unicode data directly from the Unicode Consortium and produces output in plain text, HTML, XML, and CSV formats.