Dotless Domains: A DNS Oddity

This article explores the phenomenon of "dotless domains," which are top-level domains (TLDs) like .com or .org that are directly accessible without a second-level domain. While ICANN and the IAB discourage this practice, some country code top-level domains (ccTLDs) still exist due to national jurisdiction. The article lists current and historical examples of dotless domains and analyzes their technical limitations in email delivery and website access. Furthermore, it delves into the structure of the DNS tree and the theoretical possibility of the root domain (.) having A, AAAA, and MX records, although this is practically nonexistent.