Root Zone Label Generation Rules

The rules determining which labels may be used as internationalised top-level domains in the DNS root zone, and which labels are variants of one another. Each script is maintained as its own element ruleset; the Common ruleset integrates them all.
The ruleset is maintained as one file per writing system, each developed by a community generation panel for that script, plus an integrated ruleset that merges them all and carries the variant relationships that cross script boundaries. A label is eligible for the root zone only if the integrated ruleset says so.
27 rulesets, covering 26 writing systems, based on Unicode 16.0.0.
The IANA functions coordinate the Internet’s globally unique identifiers, and are provided by Public Technical Identifiers, an affiliate of ICANN.