ICANN Acronyms and Terms

ICANN has hundreds of acronyms and terms, which can be confusing. We created this multilingual tool to help explain what these terms mean and facilitate your work within the ICANN community.

Term of the Day

ICANN Acronyms and Terms

Type in the acronym or term you are looking for in the Search bar below.
In addition to English, translated versions of acronyms and terms are also available in Arabic, Chinese, French, Russian, and Spanish. Links for each language are located in the top right of the page.
Click the first letter of the term you are looking for to search alphabetically.


  • subdomain

    A domain that resides within a higher-level domain in the Domain Name System hierarchy. For example, the domains community.icann.org and gnso.icann.org are subdomains of the second-level domain icann.org. The domain icann.org is a subdomain of the top-level domain .org.

    Subdomains can be delegated to specific entities. Registrars, for example, delegate second-level domains to registrants. The registrants can then delegate subdomains within their second-level domains.