Top 10 TLDs You Should Secure for Your Startup

When you launch a company, your domain name is the front door to everything you build: your website, your email, your product, and your reputation. But securing a single domain is rarely enough. The smartest founders register the top TLDs for startups early, before a competitor, a typosquatter, or an opportunistic domain investor does it for them. A top-level domain (TLD) is the suffix at the end of a web address, the part after the final dot, and choosing the right ones is a strategic decision, not an afterthought.

Securing multiple TLDs gives your startup three concrete advantages: brand protection (so customers always find the real you), defensive registration (denying lookalike addresses to bad actors), and runway (room to grow into new products, sub-brands, or a future rebrand). The cost of registering a handful of extensions today is trivial compared with buying back a hijacked domain later, or losing customers to a phishing clone. This guide walks through the ten extensions most worth grabbing and how to deploy them.

How to choose TLDs for your startup

Focus on four criteria. Relevance: does the suffix signal what you do (a developer tool reads well on .dev or .io)? Memorability: short, pronounceable, and easy to type wins. Tech credibility: certain extensions carry instant recognition in startup and investor circles. Defensive coverage: secure the obvious lookalikes so no one can ride on your brand. Balance these against your budget, prioritizing the exact-match version of your name across the extensions your audience is most likely to type.

The top 10 TLDs to secure for your startup

1. .com — the default the world still types

.com remains the most recognized and trusted extension on the internet, the one users type by reflex and the one most email clients and apps assume. It is operated by Verisign under an ICANN registry agreement, and you can review its delegation record in the IANA root database. If you secure only one domain, make it your .com. There are no eligibility restrictions, so the main challenge is availability.

2. .io — the tech and SaaS favorite

.io became a darling of startups because "I/O" means input/output in software, giving it built-in technical resonance. It is the country-code TLD assigned to the British Indian Ocean Territory, with the registry now operated by Internet Computer Bureau under Identity Digital, per its IANA delegation record. Registration is open to anyone worldwide. Note that the territory's long-term geopolitical status has been discussed publicly, so treat .io as a strong complement to, not a replacement for, your .com.

3. .ai — the obvious choice for AI startups

.ai has exploded alongside the artificial-intelligence boom, making it close to mandatory for any AI-focused company. It is the country-code TLD for Anguilla, administered by the government of Anguilla, which announced a partnership with Identity Digital in 2024 to manage its growth; see the IANA record. Registration is open with no AI-industry requirement, but pricing and renewal terms differ from typical gTLDs, so plan ahead.

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 operated by Radix, one of the largest new-gTLD registries, with technical backend services provided by Tucows. It plainly labels your company as technology-focused and tends to have wider availability than the crowded .com space, which can help when your ideal exact-match .com is taken. There are no special eligibility restrictions for .tech.

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 widely read as shorthand for "company," "corporation," or "commerce," and it is short enough to be highly memorable. It is the country-code TLD for Colombia; in 2025 the operating contract transferred to a new consortium involving Team Internet, as shown in its IANA record. Registration is open globally, making .co a popular fallback when the matching .com is unavailable.

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 on day one. A practical baseline: register the exact-match version of your brand across the top two to four extensions your audience actually types (almost always your .com plus one or two of .io, .ai, or .co), then add the one category TLD that fits your product, such as .app, .dev, .tech, or .club. This blocks the most likely typosquatting and impersonation targets while keeping costs reasonable.

From there, treat your portfolio like any other critical asset. Watch your renewal dates closely, since an expired core domain can be snapped up within hours and is expensive or impossible to recover. Enable auto-renew, keep your registrant contact information current, and consider redirecting your defensive registrations to your primary site so they all funnel traffic and reputation back to one canonical brand.

Register your startup domains at Namefi

Namefi is an ICANN-accredited registrar built for founders who want to manage their entire domain portfolio in one place. You get transparent pricing with no surprise upsells, fast DNS so changes propagate quickly, and support for the extensions above and many more. Namefi also supports Web3 tokenization, letting you hold eligible domains as NFTs, which makes ownership portable and programmable in a way traditional registrars cannot match. Secure your startup's core .com alongside its category and defensive extensions, then manage renewals and DNS from a single dashboard at Namefi.

Frequently asked questions

How many TLDs should a startup actually register?

Most early-stage startups are well served by three to five: your primary .com, one or two memorable alternatives your audience types (such as .io, .ai, or .co), and one category extension that matches your product. Add more only as your brand and budget grow.

Does my domain extension affect SEO?

Not directly. Google's Search Central team states that its systems treat new gTLDs like any other gTLD, and that keywords in a TLD give no ranking advantage or disadvantage, as explained in Google's official post on handling new top-level domains. A TLD can influence SEO indirectly, though, by affecting user trust and click-through rate, which is one reason a recognizable extension still matters.

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

Yes. Extensions like .io and .ai are technically country-code TLDs (for the British Indian Ocean Territory and Anguilla respectively), but both accept registrations from anyone worldwide and are used overwhelmingly by global tech companies for their wordplay, not their geography.

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.