What Is a Top-Level Domain?

A top-level domain (TLD)—also known as a domain extension, domain suffix, or URL extension—is the period and text to the right of a domain name (e.g., “.com” in “example.com”).

TLDs can indicate a website’s category or country of origin. For example:

• A site with the .com TLD often conducts commercial activities
• A site with the .uk TLD usually operates from the United Kingdom

TLDs also help web browsers route users to the correct domain.

How?

TLDs are part of the Domain Name System (DNS), which resolves domain names into IP addresses. Computers then use these IP addresses to retrieve website content.

Various organizations operate TLDs.

For instance, VeriSign Global Registry Services operates the .com TLD. And the Cybersecurity and Infrastructure Security Agency operates .gov.

The Internet Assigned Numbers Authority (IANA) oversees these TLD operators. It’s run by Public Technical Identifiers (PTI), an affiliate of the global domain management nonprofit Internet Corporation for Assigned Names and Numbers (ICANN).

Examples of Top-Level Domains

Examples of TLDs include:

Does Your Top-Level Domain Matter?

Your TLD can influence your site’s:

• Identity: A TLD can indicate your site’s main activity. For instance, .ai can convey an artificial intelligence focus. And .edu can convey status as a United States post-secondary institution.
• Memorability: Create memorable vanity domains, or domain hacks, by using a TLD that forms a word or phrase—like your brand name. One example is mailchi.mp, which redirects to the Mailchimp site. And Yum! Brands’ ta.co domain for its Taco Bell page.
• Brand perception: Choosing a widely accepted TLD like .com or .org can increase user trust. Using an uncommon TLD, like .xyz or .cool, could make your brand appear less reputable.
• Organic traffic: Searchers who think your site is more legitimate—due to it having a trustworthy TLD—may be more likely to click it on the search engine results pages. Which can improve search engine optimization (SEO) performance.

Types of Top-Level Domains

There are six main TLD types:

Generic Top-Level Domains

Generic TLDs (gTLDs) are TLDs that don’t refer to a specific country. Examples include:

• .com
• .org
• .net

Organizations or individuals can generally use gTLDs to register domains for various purposes, like blogs, online stores, or art galleries.

Brands can also register with ICANN to create custom gTLDs reflecting their brand name (e.g., .google, .bloomberg).

Generic Restricted Top-Level Domains

Generic restricted TLDs (grTLDs) are gTLDs limited to specific uses.

The three available grTLDs are:

• .biz: For business or commercial purposes
• .pro: For professionals
• .name: For personal identity

Anyone can register a domain with a grTLD if they follow its intended purpose. Like registering a .biz domain for their business’s site.

But others can challenge the registration if they believe the registrant is misusing the grTLD. Like registering a .biz domain for their family’s online photo album.

A successful challenge may lead to cancellation or transfer of the domain.

Sponsored Top-Level Domains

Sponsored TLDs (sTLDs) are managed by organizations that support specific communities. These sponsor organizations can set the sTLD’s policies and decide who can register domains.

Examples of sTLDs are:

• .gov: An sTLD sponsored by the Cybersecurity and Infrastructure Security Agency for United States government entities
• .edu: An sTLD sponsored by Educause for United States post-secondary institutions
• .asia: An sTLD sponsored by DotAsia Organisation for entities with Asia-Pacific links

Country-Code Top-Level Domains

Country-code TLDs (ccTLDs) are two-letter TLDs representing countries, sovereign states, and dependent territories with country codes.

Examples of ccTLDs are:

• .us: United States
• .uk: United Kingdom
• .ca: Canada
• .fr: France
• .jp: Japan
• .kr: South Korea
• .ai: Anguilla

Many brands register domains with ccTLDs to signal operations in specific countries, which can help with international SEO.

Some ccTLDs also serve as industry-related shortcuts. Like .ai to refer to artificial intelligence instead of Anguilla. And .tv to refer to television instead of Tuvalu.

Test Top-Level Domains

Test TLDs (tTLDs) are reserved for testing and cannot be used for domain registrations.

Examples of tTLDs are:

• .test
• .example
• .localhost
• .invalid

These tTLDs are good candidates for testing software and site URLs without inadvertently visiting a working domain.

Infrastructure Top-Level Domain

There is only one infrastructure TLD: .arpa.

It supports technical services that help users access the internet. It originally referred to the Advanced Research Projects Agency, the organization that developed internet predecessor ARPANET.

But after ARPANET transitioned to the internet, “ARPA” now stands for Address and Routing Parameter Area.

And .arpa cannot be used for domain registrations.

Do Research to Find the Right TLD for Your Website

Researching competitor TLDs can help you decide which TLD aligns with your goals.

If many competitors and their linking sites use a particular TLD, it may also suit your website.

To discover the TLDs of competing sites, search a phrase related to your business. Then, check the TLDs of sites ranking for it.

Next, use Semrush Backlinks tool to view the TLDs of sites linking to these competitors.

Enter a competing domain and click “Analyze.”

In the “Overview” report, scroll to the “TLD Distribution” section.

This section shows the TLDs of sites linking to your competitor and their relative popularity.

Use these insights to inform your decision on the right TLD for your brand and audience.

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