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Proposal for Japanese Script Root Zone Label Generation Rules

30 September 2021

Today, the Internet Corporation for Assigned Names and Numbers (ICANN) has opened a Public Comment proceeding to receive input on the proposal for Japanese Script Root Zone Label Generation Rules.

Link to Public Comment Proceeding:

Open for Submissions Date: Thursday, 30 September 2021

Closed for Submissions Date: Tuesday, 16 November 2021

Category: Technical

Requester: ICANN org

What We Need your Input On:
Root Zone Label Generation Rules (RZ-LGR) are developed to define a conservative mechanism to determine valid Internationalized Domain Name (IDN) top-level domains (TLDs) and their variant labels. The successful development of Label Generation Rules depends on having community-based Generation Panels (GP) for each script that will be used in the root zone.

The Japanese Script GP has finalized the proposal for Japanese Script Root Zone Label Generation Rules (Japanese Script RZ-LGR). The proposal is being published for Public Comment before being finalized and submitted to the Integration Panel for review and integration into the next version of RZ-LGR.

Generation Panel (GP) members are representatives from each of the communities that use a particular script or writing system and their role is to identify the valid characters, variant code points, and Whole Label Evaluation (WLE) rules for the given script or writing system. Each GP starts by considering the code points for the relevant script that are present in the Maximal Starting Repertoire (MSR) and, based on these, develops a Label Generation Rules proposal to be used to generate TLD labels for that script. In doing so, they may need to coordinate efforts with other GPs whenever their scripts are closely related. These proposals are reviewed by the community through a Public Comment proceeding and then by an expert Integration Panel for approval and integration into the next version of RZ-LGR. The details of this process are defined in the LGR procedure.

Currently, there are multiple script communities that have formed Generation Panels and are actively working towards finalizing Label Generation Rules (LGRs) proposals for the root zone, including Japanese, Latin, and Myanmar scripts. LGRs for the following 18 scripts have already been completed and integrated into the fourth version of RZ-LGR: Arabic, Bangla, Chinese, Devanagari, Ethiopic, Georgian, Gujarati, Gurmukhi, Hebrew, Kannada, Khmer, Lao, Malayalam, Oriya, Sinhala, Tamil, Telugu, and Thai. In addition, Armenian, Cyrillic, Greek, and Korean script proposals have also been completed and are waiting to be integrated.

Next Steps
Following the Public Comment period, the Japanese Script GP will make any necessary changes to the proposal due to community feedback. The GP will then submit the final proposal for evaluation to the Integration Panel. If the proposal is successfully evaluated, it will be integrated into the next version of the RZ-LGR. If not, the proposal will be sent back to the Japanese Script GP with comments for further consideration and revision.


ICANN's mission is to help ensure a stable, secure, and unified global Internet. To reach another person on the Internet, you need to type an address – a name or a number – into your computer or other device. That address must be unique so computers know where to find each other. ICANN helps coordinate and support these unique identifiers across the world. ICANN was formed in 1998 as a nonprofit public benefit corporation with a community of participants from all over the world.