Domain Availability Checker
Check domain availability across popular TLDs, or enter any custom extension you want to verify.
Leave extensions blank to check the default global set. Add any extension list to check exactly those TLDs.
How to use the Domain Availability Checker
Check domain availability across popular TLDs, or enter any custom extension you want to verify. Enter the domain, hostname, IP address, selector, or record value requested by the tool, then run the check to see the current public configuration. Use the result to confirm whether the domain is resolving correctly, whether email authentication is aligned, or whether a visible trust issue needs follow-up.
Enter the domain or value you want to inspect.
Review the returned records, warnings, and status signals.
Fix the DNS, hosting, SSL, or email setting, then retest.
What to check next
A single lookup rarely tells the whole story. For production websites, verify DNS, SSL, email authentication, blacklist status, and public security headers together before making a launch, migration, or deliverability decision. Common next checks after this page include WHOIS Lookup, Domain Age, DNS Checker.
Domain Availability Checker FAQ
What does the Domain Availability Checker check?
Check domain availability across popular TLDs, or enter any custom extension you want to verify.
Is the Domain Availability Checker free to use?
Yes. The basic domain availability checker is free and does not require a login. Paid Hostao reports and fix plans are available when you need analyst review or managed remediation.
When should I run the Domain Availability Checker?
Run it before DNS changes, email sender changes, hosting migration, SSL renewal, launch checks, or whenever a website, domain, or email delivery issue needs quick verification.