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Second-level Reference Label Generation Rules for the Arabic, Hebrew, and Sinhala Scripts, and Hebrew Language are Published

22 April 2021

The Internet Corporation for Assigned Names and Numbers (ICANN) today announced the publication of Second-level Reference Label Generation Rules (LGRs) for the Arabic, Hebrew, and Sinhala scripts, as well as the Hebrew language.

Second-level Reference LGRs are guidance on how domain names in these scripts might be registered. They are published to improve the transparency and consistency of the Internationalized Domain Name (IDN) table review process and facilitate registry operations. Second-level Reference LGRs can be used or referred to by generic top-level domain (gTLD) registries when developing IDN tables that suit their business needs. Published reference LGRs are used when reviewing the LGR or IDN tables submitted by gTLD registries, e.g., through the Registry Service Evaluation Policy (RSEP) process.

The Second-level Reference LGRs for the Arabic, Hebrew, and Sinhala scripts, and the Hebrew language have been developed in consultation with the respective script communities following detailed analysis for the Root Zone Label Generation Rules (RZ-LGRs). These Second-level Reference LGRs have been finalized and released after the Public Comment period.

A total of 31 language-based and 16 script-based reference LGRs have been published. Additional languages and scripts will be included in future releases as relevant community input becomes available.


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.