Whois Lookup
Look up Whois information for domains and IP addresses
Features
Whois/RDAP Support
Retrieve information from both Whois and RDAP protocols
Domain and IP Support
Automatically detect and query both domain names and IP addresses
Batch search up to 50 records
Submit multiple queries separated by line breaks for a combined list view
Toggle Formatted and Raw Data
Switch between readable table format and original text via tabs
How to Use
Enter Domain or IP Address
Type the domain name or IP address you want to search in the input field; separate multiple entries with line breaks
Query with Execute Button
Click the execute button to query Whois/RDAP on the server side and display results
Check Formatted Tab and Raw Data
View items by category in the formatted tab, and copy or download from the raw data tab
Use Cases
Domain Research Before Registration
Check registration status and registrant information for similar domains before acquiring
Pre-transfer Domain Verification
Check status information in advance to verify lock status and transfer eligibility
Domain Age Research
Determine domain operating years from registration and update dates for SEO analysis
Web Operator Information Research
Identify operator information for websites without contact pages
IP Address Attribution Verification
Identify the source of suspicious access from IP assignment organization and country information
Basic Knowledge
What is Whois
Whois is a public database system that allows you to query registration information (registrant, registration date, expiration date, name servers, etc.) for domain names and IP addresses. It is a fundamental tool for investigating domain ownership and details.
What is RDAP
RDAP is a standardized query protocol that succeeds Whois. It returns results as structured data (JSON), making it easier for machine processing, and support is expanding across various registries.
Safety and Privacy
Server-side processing
Input is processed on the server; only information necessary for the inquiry is sent.
Temporary processing only
For Whois/RDAP queries, temporary processing occurs on the server, then data is discarded after results are returned.
Communications encrypted with HTTPS
All sent and received data is encrypted by TLS and cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
Transmission to inquiry servers only
Input queries are sent to Whois/RDAP registries for inquiry purposes only.
Follow RAKKOTOOLS on Google Search
217 useful tools become easier to find from Google Search and AI Search!
- Found in search
- Also shown in AI Search
- Discover new tools
Updates
- update #312
Fixed to allow searching Japanese domain names directly in Whois lookup
- update #289
Whois search formatted table now displays contact information for registrants and contacts
- update #268
Extended bulk Whois search to up to 50 records
- update #236
Added notice display for exceeding 10 results in Whois search and sample overwrite confirmation
- update #93
Fixed Whois search bulk results to display in the order they were entered
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
If you mention it, I get motivated to create more tools!
If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.