Free Domain Name Checker – Check Availability Across All Extensions

What Is a Domain Name Checker?

A domain name checker queries the live RDAP and WHOIS registration databases to tell you instantly whether a domain is available to register or already taken. This tool checks your domain name with all extensions — .com, .net, .org, .io, .co, .dev, .app, and .ai — in a single search rather than making you check one TLD at a time.

Unlike many domain checkers that redirect you to a registrar shopping cart, this is a free domain checker without buying — no affiliate links, no registration pressure, no upsells. You see the results and decide independently where (and whether) to register. If you have already registered a domain and want to verify its DNS is configured correctly, our DNS lookup tool lets you check A, MX, TXT, NS, and other records in real time.

How to Check If a Domain Name Is Available

• Step 1: Enter a name — just the word or brand, without an extension (e.g. "mybrand" not "mybrand.com"). The tool strips any URL formatting automatically.
• Step 2: Press Enter or click "Check." All 8 extensions are queried simultaneously using live RDAP/WHOIS data.
• Step 3: Green rows with a checkmark are available to register right now. Red rows with a lock icon are already taken — many also show the registrar or nameserver so you can see who holds it.
• Step 4: If your preferred .com is taken, check the other extensions for alternatives — or modify the name and search again.

.com vs .net vs .org — Which Extension Is Better?

Choosing the right domain extension depends on your use case, audience, and brand positioning. Here is a comparison of all 8 extensions this tool checks:

If .com is available for your brand, register it first — it carries the highest trust and recognition globally. Then consider securing .net and .org as brand protection. For tech and startup brands, .io, .dev, and .ai are strong choices if the .com is taken or if the extension reinforces your brand identity.

Why Check Multiple Extensions at Once?

• Brand protection — Registering your brand across the most important TLDs prevents competitors or squatters from securing a confusingly similar domain.
• Fallback options — If your .com is taken, a .io, .co, or .dev may be available and perfectly suitable for your audience.
• SEO considerations — Different TLDs suit different niches. .dev and .app are widely used by software products, .org by non-profits, .ai by AI companies.
• Future-proofing — Securing multiple extensions while they are available is far cheaper than buying them later from a reseller at a premium.

How to Find Out Who Owns a Domain

When a domain shows as "Taken," this tool displays the registrar name or primary nameserver when available from the RDAP/WHOIS response. This tells you which company the domain is registered through (e.g. GoDaddy, Namecheap, Cloudflare). For full ownership details, a complete WHOIS lookup would show the registrant's name, organization, and contact information — though most domain owners now use WHOIS privacy protection services that replace their personal details with the registrar's proxy information.

If you want to investigate a domain further — checking its DNS records, mail server configuration, or whether it is actively hosting a website — our DNS lookup tool lets you query A, AAAA, MX, TXT, NS, CNAME, and SOA records for any domain. And our IP address detector can help you identify the IP address and hosting provider behind any website.

Tips for Choosing a Great Domain Name

• Keep it short — shorter domains are easier to type, remember, and share. Aim for 6 to 14 characters if possible.
• Make it pronounceable — if you cannot easily say it over the phone, it will be harder for people to remember and share.
• Avoid hyphens and numbers — they are confusing verbally ("is it dash or hyphen? the number 4 or the word four?") and look less professional.
• Check for trademark conflicts — before registering, search your country's trademark database to make sure the name does not infringe on an existing brand.
• Prioritize .com — if the .com is available, secure it even if you plan to use a different extension as your primary. People will type .com by default.
• Think about email — your domain will likely also be your email domain ([email protected]). Make sure it looks professional in that context. If you plan to use email on your domain, our email validator can verify that your MX records are properly configured after setup.

What Happens After You Find an Available Domain?

Once you have identified an available domain name, the next steps are registration and configuration:

• Register with a registrar — popular options include Cloudflare Registrar (at-cost pricing), Namecheap, Porkbun, and GoDaddy. Compare renewal prices, not just first-year promotional rates.
• Set up DNS records — point your domain to your hosting provider by configuring A records (for the website) and MX records (for email). Our DNS lookup tool lets you verify these records are working correctly after you set them up.
• Enable WHOIS privacy — most registrars offer free WHOIS privacy protection that hides your personal contact details from public lookup databases.
• Configure email — set up email hosting (Google Workspace, Microsoft 365, Zoho, etc.) and publish SPF, DKIM, and DMARC records to prevent your emails from landing in spam.
• Secure with SSL — ensure your site uses HTTPS. Most hosting providers include free SSL certificates via Let's Encrypt. Note that .dev and .app extensions require HTTPS by design.

Common Domain Registration Mistakes to Avoid

• Only registering one extension — if your brand is "mybrand" and you only register mybrand.com, someone else can register mybrand.net and potentially confuse your customers.
• Falling for the first-year discount trap — some registrars offer $1 domains the first year but charge $20+ on renewal. Always check the renewal price.
• Using the registrar's website builder unnecessarily — registrar-provided website builders are often limited and lock you in. Register the domain separately and use a proper hosting provider.
• Forgetting to renew — set your domain to auto-renew. Expired domains enter a redemption period and can be snapped up by domain squatters within days.
• Not setting up email authentication — without SPF, DKIM, and DMARC records, emails from your domain may be rejected or flagged as spam. Use our DNS lookup tool to check your TXT records after configuration.

Frequently Asked Questions

Final Thoughts

Your domain name is the foundation of your online identity — it is the first thing people see, the address they type, and the brand they remember. Use this free domain name checker to find the right name across every major extension before someone else takes it.

After registration, verify your setup with our DNS lookup tool to confirm DNS records are configured correctly, our email validator to check that MX records are active for email, and our IP address detector to verify your site is resolving to the expected server.