TLDn
TLDn, short for Top-Level Domain n, is a hypothetical extension to the Domain Name System (DNS) used in discussions about scalable namespace expansion. In the TLDn concept, the set of top-level domains would be organized into families by attaching a numeric index to the base TLD, creating separate, independently manageable top-level namespaces. TLDn is not an established standard and has not been adopted by ICANN or major registries.
Structure and operation: A TLDn label designates a distinct top-level namespace. For example, a base TLD such
Status and reception: The concept has appeared mainly in theoretical discussions and academic papers about DNS
Potential implications: Proponents argue that TLDn could enable safer testing of new policies, reduce collision risk
See also: Domain name system, top-level domain, ICANN, DNSSEC, IDN.