TLD (top-level domain)

Also called top-level domain

TLD, explained

The DNS is a hierarchy, and TLDs sit directly below the root. IANA, run by an ICANN affiliate, publishes the official list of TLDs in the root zone: 1,437 on October 1, 2026. They fall into a few groups: generic TLDs, or gTLDs, which include legacy names such as .com, .net and .org and the new gTLDs added since 2013; country-code TLDs, or ccTLDs, such as .uk or .de, mostly based on two-letter ISO country codes; sponsored TLDs for specific communities, such as .gov and .edu; and .arpa, reserved for infrastructure.

Registrations are concentrated. There were 401.6 million domain registrations across all TLDs at the end of the second quarter of 2026, according to the Domain Name Industry Brief; .com alone had 166.6 million, country codes together 148.6 million and new gTLDs 52.9 million.

For a domain investor, the TLD decides who can buy a name and how liquid it is. A .com has the deepest pool of buyers and the most sales data, and .com names made up 66% of Sedo's sales in 2025, according to the Global Domain Report 2026. Most other extensions have thinner markets, different pricing and their own rules. Before buying outside .com, check who runs the registry, the renewal price, any local-presence requirement, whether the UDRP applies and how expired names are released. The common mistake is assuming a great word in a weak extension is a great domain.

AI has already redrawn this map once: .ai, a country code, is now used worldwide as a generic label for AI companies, following the path of .io and .co. ICANN's 2026 round is expected to add more extensions. The practical view is that each new TLD splits attention further, which so far has reinforced the position of .com rather than replaced it.

Go deeper How to Start Domain Investing: A Beginner's Guide

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