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Root Zone Label Generation Rules (RZ-LGR) define a conservative mechanism to determine valid Internationalized Domain Names (IDNs) and their variant labels.[1]


First released in 2012, the process for developing RZ-LGR currently follows the Procedure to Develop and Maintain the Label Generation Rules for the Root Zone in Respect of IDNA Labels, last updated in 2013. Broadly speaking, Step #, a Generation Panel makes a broad set of code points for the relevant script, called the "Maximal Starting Repertoire," and proposes Label Generation Rules. Step #, the team's proposal is reviewed by the ICANN Community through Public Comment and then by the Integration Panel for approval and integration into the LGR for the Root Zone.


The latest version, RZ-LGR-4, published in November 2020, includes 18 scripts:

  • Chinese,
  • Bangla,
  • Arabic,
  • Devanagari,
  • Ethiopic,
  • Georgian,
  • Gujarati,
  • Gurmukhi,
  • Hebrew,
  • Kannada,
  • Khmer,
  • Lao,
  • Malayalam,
  • Oriya,
  • Sinhala,
  • Tamil,
  • Telugu, and
  • Thai.[2]


  • The Latin Script and Japanese Script RZ-LGR proposals have been published for Public Comment.
  • The Integration Panel is preparing to integrate the Armenian, Cyrillic, Greek, Japanese, Korean, and Latin script proposals into RZ-LGR version 5.