WHOIS Lookup

WHOIS (pronounced "who is") is one of the internet's oldest protocols, dating back to 1982 when the ARPANET was transitioning to the modern internet. It was created to answer a simple question: who is responsible for a given domain name or IP address?

A WHOIS lookup reveals key information about domain registration: the registrar (company managing the domain), registration and expiration dates, nameservers (DNS hosting), and historically, the registrant's contact details. Today, our tool uses RDAP (Registration Data Access Protocol), the modern, standardized successor to traditional WHOIS.

A WHOIS lookup typically reveals the following information:

• Registrar: The ICANN-accredited company managing the domain (e.g., GoDaddy, Namecheap, Cloudflare). This tells you where the domain is registered and who to contact for acquisition.
• Registration Date: When the domain was first registered. This is the creation date used for calculating domain age.
• Expiration Date: When the current registration period ends. Domains not renewed may become available for others to register.
• Last Updated: When the domain record was last modified (nameserver changes, renewals, transfers).
• Nameservers: DNS servers handling the domain's records. Often reveals hosting provider (e.g., Cloudflare, AWS Route 53).
• Status Codes: EPP status codes indicating domain state (locked, pending transfer, expired, etc.).
• DNSSEC: Whether the domain has DNS Security Extensions enabled for authentication.

The landscape of WHOIS privacy changed dramatically with GDPR (General Data Protection Regulation) in May 2018. Before GDPR, most WHOIS records displayed:

• Registrant name and organization
• Full postal address
• Phone number and email

Post-GDPR, this personal data is now redacted by default for EU residents, and most registrars extend this protection globally. Contact is now handled through privacy proxy services or web forms.

WHOIS/RDAP lookups serve many professional purposes:

• Domain Acquisition: Research who owns a domain, when it expires, and how to contact them for purchase negotiations.
• Brand Protection: Monitor similar domains, identify cybersquatting, and gather evidence for trademark disputes (UDRP).
• Competitor Analysis: Discover competitor domain portfolios using reverse WHOIS, track their new registrations.
• Fraud Investigation: Verify website legitimacy, trace phishing domains, and gather evidence for legal action.
• Technical Troubleshooting: Verify nameserver configurations, check DNSSEC status, diagnose DNS issues.
• Legal Compliance: Identify domain owners for DMCA takedowns, cease and desist letters, or court proceedings.

RDAP (Registration Data Access Protocol) is replacing traditional WHOIS across registries. Here's why the transition matters:

• Structured Data: RDAP returns JSON instead of free-form text, making parsing reliable and consistent.
• Secure Transport: RDAP uses HTTPS, protecting queries and responses from interception.
• Standardization: All registries follow the same response format, unlike WHOIS which varied wildly.
• Bootstrap System: RDAP uses a bootstrap file to route queries to the correct registry automatically.
• Built-in Privacy: RDAP was designed with privacy considerations from the start.

Our tool uses RDAP for all supported TLDs, ensuring you get reliable, structured data directly from authoritative registries.