WHOIS Lookup
Discover detailed information about domain registrations with our WHOIS Lookup tool. This powerful online utility retrieves WHOIS data for any domain, providing information about the domain owner, registration dates, expiry dates, and more. Perfect for webmasters, domain investors, and security professionals, this tool helps you understand the history and ownership of any domain without any software installation.
How the WHOIS Lookup finds a domain's record
The WHOIS Lookup asks whois.iana.org over the WHOIS protocol (RFC 3912, TCP port 43), follows the referral to the registry's WHOIS server and shows the fields of the last response as a list, such as Registrar, Creation Date and Name Server.
It asks at most three servers, waits up to 5 seconds for each and reads up to 256 KiB per response. Comment lines starting with % or # are skipped, field names are shown in title case, and a field that appears more than once, such as Name Server, is joined into one line.
Worked examples
A .com domain
IANA refers .com queries to the Verisign registry, and the registry's answer is shown. The registry response is shortened here.
- Domain
example.com
- Server responses, shortened
whois.iana.org refer: whois.verisign-grs.com whois.verisign-grs.com Domain Name: EXAMPLE.COM Registrar: RESERVED-Internet Assigned Numbers Authority Creation Date: 1995-08-14T04:00:00Z Name Server: A.IANA-SERVERS.NET Name Server: B.IANA-SERVERS.NET- Result
Domain Name: EXAMPLE.COM
Registrar: RESERVED-Internet Assigned Numbers Authority
Creation Date: 1995-08-14T04:00:00Z
Name Server: A.IANA-SERVERS.NET B.IANA-SERVERS.NET
A URL instead of a domain
Enter only the domain name.
- Domain
https://example.com/about
- Result
Enter a valid domain name without a path or port.
Lookup limits
| Step | Value |
|---|---|
| Protocol and port | TCP 43 |
| First server asked | whois.iana.org |
| Fields that point to the next server | refer, whois, registrar whois server |
| Most servers asked per lookup | 3 |
| Wait per server | 5 s |
| Largest response read | 262144 B (256 KiB) |
RDAP (RFC 9083) is the JSON-based successor to WHOIS. This tool speaks WHOIS only.
Frequently asked questions
How do I perform a WHOIS lookup?
To perform a WHOIS lookup, enter the domain name (without http:// or https://) into the input field and click the Lookup WHOIS button. The tool queries WHOIS databases and displays comprehensive registration information including registrant details, registration dates, name servers, and status.
What information does the WHOIS Lookup provide?
The WHOIS Lookup provides registrant contact information (name, organization, email, phone, address), registration date, expiration date, last updated date, domain registrar, name servers (DNS), domain status, creation history, and administrative/technical contact details when available and not privacy-protected.
Why is WHOIS information important?
WHOIS information helps identify domain owners, verify domain legitimacy, investigate phishing or fraud, research competitor ownership, contact domain owners for purchase inquiries, resolve trademark disputes, check domain history, verify registration details, and monitor domain status for security and business intelligence.
Is WHOIS information always public?
WHOIS information is generally public, but GDPR and privacy regulations allow owners to use privacy protection services (WHOIS privacy, domain privacy) that mask personal contact details. Privacy-protected domains show registrar or privacy service information instead of actual owner details, limiting direct contact ability.
Can I use the WHOIS Lookup for any domain?
Yes, you can look up WHOIS information for any publicly registered domain across all TLDs (.com, .net, .org, country codes, new gTLDs). Enter the domain name to retrieve its registration information. Some country-code TLDs may have restricted WHOIS access or require special permissions.
How often should I check WHOIS information?
Check WHOIS information when acquiring domains, before expiration dates, monitoring portfolio domains, investigating suspicious sites, researching domain purchases, conducting trademark searches, verifying registration updates, or detecting unauthorized changes. Regular monitoring (monthly/quarterly) helps maintain domain security and ownership verification.
How do I find domain expiration dates?
WHOIS lookup reveals exact expiration dates. Monitor these dates to prevent accidental domain loss—domains can be claimed by others if they expire. Set calendar reminders for 60-90 days before expiration, enable auto-renewal, and regularly verify your domains won't expire unexpectedly.
Can I contact a domain owner through WHOIS?
If WHOIS shows contact information (not privacy-protected), you can reach owners via listed email or phone. For privacy-protected domains, try generic emails (admin@domain.com, info@domain.com), contact forms on the website, or reach out through social media. Some registrars forward messages to privacy-protected owners.
What are name servers in WHOIS data?
Name servers (DNS servers) listed in WHOIS control domain's DNS records. They reveal who hosts the domain: registrar's servers, third-party DNS (Cloudflare, AWS Route 53), or custom servers. This information helps understand site infrastructure, migration history, or identify hosting providers.
How do I verify domain ownership?
Compare WHOIS registrant information with claimed ownership. Check registration dates match expected timelines, verify contact details align with known information, confirm name servers match hosting claims, and cross-reference with other public records. However, privacy protection limits verification ability.
What is domain status in WHOIS?
Domain status codes indicate state: clientHold (suspended), pendingDelete (being deleted), redemptionPeriod (grace period after expiration), locked (transfer-protected), active (normal operation). Understanding statuses helps identify domain availability, transfer eligibility, or potential acquisition opportunities.
Can WHOIS help identify phishing sites?
Yes, WHOIS reveals recently registered domains (phishing sites often use new domains), suspicious registrants, unusual name servers, domains registered in bulk, or registration patterns indicating malicious intent. However, privacy protection and false information limit investigation ability. Use WHOIS as one tool among many for fraud detection.
How do I research domains before purchasing?
Use WHOIS to check domain age (older is better for SEO), previous owners, registration history, current status, expiration date (buy before it expires), and verify it's actually available. Domain history reveals previous use, helping avoid domains with bad SEO history or penalties.
What is WHOIS privacy protection?
WHOIS privacy (domain privacy) replaces owner contact information with privacy service details, protecting against spam, unwanted contact, and identity theft. Most registrars offer it free or for small fees. It hides personal information while maintaining domain functionality and legal ownership rights.