Top 10 TLDs to Evaluate for Your Startup

When you launch a company, your domain name can support your website, email, product, and brand. A single registration may be enough for some startups; others choose exact-match registrations across a few relevant extensions. A top-level domain (TLD) is the suffix after the final dot. Choosing additional TLDs is a budget and risk decision, not a universal requirement.

Additional exact-match TLDs can reserve specific addresses for redirects, future products, or defensive use, but they do not guarantee that customers find the right site and do not block typo variants, hyphenated labels, homographs, subdomain abuse, or other phishing techniques. Registrations create recurring renewal obligations, and premium names can carry materially higher registration or renewal prices. This guide presents ten extensions to evaluate rather than a mandatory shopping list.

How to choose TLDs for your startup

Focus on four criteria. Relevance: does the suffix fit what you do? Memorability: is the complete domain easy for your audience to recognize, pronounce, and type? Audience fit: do customers already understand the extension? Defensive value: would reserving this exact address reduce a specific impersonation risk? Balance those factors against recurring cost. Exact-match registrations across TLDs protect only those exact addresses; a typosquatting program separately evaluates likely label variants, homographs, monitoring, email authentication, and enforcement.

The top 10 TLDs to secure for your startup

1. .com — the default the world still types

.com is a long-established and widely recognized extension. It is operated by Verisign under an ICANN registry agreement, and you can review its delegation record in the IANA root database. Many startups evaluate the matching .com first, but availability, acquisition price, brand fit, and budget determine whether it is the right primary address.

2. .io — the tech and SaaS favorite

.io is used by startups partly because "I/O" means input/output in software. It is the country-code TLD assigned to the British Indian Ocean Territory; its IANA delegation record names Internet Computer Bureau Limited as the sponsoring organization. Check current registry and registrar eligibility and pricing. The territory's unresolved geopolitical status creates a ccTLD-specific policy question discussed in Why Are .io Domains So Expensive?, so evaluate it as its own option rather than assuming it substitutes for .com.

3. .ai — the obvious choice for AI startups

.ai is widely used for artificial-intelligence branding, but it is not mandatory for an AI company. It is the country-code TLD for Anguilla, administered by the government of Anguilla, which announced a partnership with Identity Digital in 2024; see the IANA record. Check current eligibility, registration periods, premium status, and renewal pricing with the registry and registrar before budgeting.

4. .app — secure by default

.app is operated by Google Registry and is purpose-built for software, apps, and mobile products. Its standout feature: the entire .app namespace is on the HSTS preload list, meaning every .app site is required to load over HTTPS, as Google documents in its policies. That security-by-default makes it a credible home for a product or download page. You will need a valid TLS certificate for the site to load at all.

5. .dev — built for builders

.dev, also run by Google Registry, is aimed squarely at developers, engineering teams, and technical documentation. Like .app, the whole .dev zone is on the HSTS preload list, so HTTPS is mandatory across the extension. It is a natural fit for developer-tooling startups, API docs, or an internal engineering portal. Confirm the requirements in Google Registry's documentation before you build.

6. .tech — descriptive and broadly available

.tech is a generic TLD in the Radix portfolio. It plainly labels a site as technology-focused and may provide another exact-label option when the matching .com is unavailable. Confirm the current operator, eligibility, premium classification, and renewal price through the IANA delegation record, registry policies, and your registrar before registering.

7. .xyz — flexible and startup-friendly

.xyz is a deliberately generic, unrestricted extension operated by XYZ.COM LLC under an ICANN registry agreement. Its open, neutral branding has made it popular with startups and Web3 projects alike (Alphabet's abc.xyz is a well-known example). With no relevance constraints, it is a versatile pick for a landing page, campaign, or experimental product.

8. .co — the short stand-in for .com

.co is often used as shorthand for "company," "corporation," or "commerce." It is the country-code TLD for Colombia; its current sponsoring organization appears in the IANA record. Check current registry and registrar eligibility before registering. A matching .co can be evaluated when .com is unavailable, but its typo-confusion risk, renewal price, and audience familiarity should be assessed for the specific brand.

9. .net — the classic backup

.net is one of the original generic TLDs, operated by Verisign under an ICANN registry agreement (see its IANA record). It carries an established, trustworthy reputation, especially for infrastructure, networking, and platform companies. Even if you do not build your primary brand on it, securing the .net of your exact name is a sensible defensive move.

10. .club — for community-driven startups

.club is an unrestricted generic TLD operated by GoDaddy Registry's Registry Services, LLC, per its ICANN registry agreement and IANA record. If your startup is built around membership, community, or a recurring audience, .club communicates belonging in a single word. It is a strong category extension for creator platforms, subscription products, and social ventures.

Defensive registration strategy

You do not need all ten extensions. Start with the primary domain that fits the business, then consider additional exact-match extensions only when each has a defined use or threat case. If typo variants or impersonation are a material risk, assess those labels separately; registering brand.com and brand.ai does not block braand.com, homographs, or deceptive subdomains. No finite portfolio eliminates typosquatting, so combine selective registration with monitoring, email authentication, user education, and an enforcement process.

From there, treat your portfolio like any other critical asset. Watch renewal dates closely: expiration can interrupt resolution before a domain becomes available to the public, and recovery can become more expensive or eventually impossible. For covered gTLDs, ICANN's Expired Registration Recovery Policy requires a 30-day Redemption Grace Period after deletion, during which the prior registrant can restore the name and transfer is prohibited; availability after the lifecycle completes is a later stage, not an immediate consequence of expiration. Enable auto-renew, keep your registrant contact information current, and consider redirecting defensive registrations to your primary site.

Register your startup domains at Namefi

Namefi is an ICANN-accredited registrar where founders can manage registrations, renewals, and DNS for supported extensions. Namefi also offers a token-control layer for eligible domains; registrar and registry records, ICANN policy, platform agreements, disputes, and court orders still apply. Check the live catalog and current pricing before relying on support for a particular TLD.

Frequently asked questions

How many TLDs should a startup actually register?

There is no universal number. Register a primary domain, then add an exact-match extension or label variant only when its expected defensive or product value justifies its registration price, recurring renewal cost, administrative overhead, and premium-price risk.

Does my domain extension affect SEO?

Google says its systems generally treat new gTLDs like other gTLDs and that keywords in a TLD do not create a ranking advantage or disadvantage, as explained in Google's official post on handling new top-level domains. Extension choice can still matter to branding and user expectations, but do not assume that a particular TLD improves ranking, trust, or click-through rate without evidence from your own audience and analytics.

Should I register country-code TLDs like .io and .ai if I'm not in those countries?

They may be options, but check the current registry and registrar eligibility rules before registering. .io and .ai are country-code TLDs for the British Indian Ocean Territory and Anguilla, even though they are also used for technology branding outside those territories. IANA's delegation record identifies the operator and TLD type; it is not, by itself, a statement that registration is open without restriction.

Why do some extensions like .app and .dev require HTTPS?

Google Registry placed the entire .app and .dev namespaces on the HSTS preload list, so browsers will only load these sites over a secure HTTPS connection. It is a built-in security feature: you simply need a valid TLS certificate, which most modern hosting providers issue for free.

Sources and further reading

• ICANN — Expired Registration Recovery Policy (expiration notices and the 30-day Redemption Grace Period after deletion)
• ICANN — Registry agreements (current gTLD operators and contract records)
• IANA — Root Zone Database (authoritative TLD types and delegation records)
• Google Search Central — Google's handling of new top-level domains (generic TLD ranking treatment)