An sTLD is an abbreviation of Sponsored Top-Level Domain, which is a top-level domain sponsored by a community of users. It is maintained by Internet Assigned Numbers Authority (IANA) to use in the Domain Name System on the Internet.
A complete list of Sponsored Top-Level Domains (sTLDs) in the world
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About Sponsored Top-Level Domains (sTLDs)
A Sponsored Top-Level Domains (sTLDs) is generally registered for a specific group of community that is backed by a sponsor. For example, .Asia is a Sponsored Top-Level Domain sponsored by DotAsia organization for Asia and the Pacific region.