Instant WHOIS
Lookup for 200+ TLDs
Check availability, monitor expiry dates, and view full registration details on any site you visit, in one click.
Add to Chrome 
Add to Firefox 
Walkthrough
See it in action
A 30-second tour of WHOIS lookup, availability checks, and expiry monitoring.
Features
Everything you need for domain research
Instant WHOIS Lookup
Full domain registration details, expiry dates, and nameserver info in seconds.
200+ TLD Support
Works with .com, .net, .org, .io, .ai, and 200+ more TLDs across all major registries.
Availability Checker
Instantly check if domains are available for registration. Quick TLD buttons help you test alternatives.
Expiry Monitoring
Track expiration dates at a glance. Visual warnings alert you to domains nearing expiry.
Nameserver Details
View complete DNS configuration including nameservers, registrar information, and domain status.
Privacy-Focused
All data stored locally on your device. No tracking, no analytics, no personal data collection.
Getting started
Up and running in seconds
Install
Add the extension from Chrome Web Store or Firefox Add-ons. No account needed.
Click
Open the extension from your toolbar or press Alt+Shift+D anywhere on any page.
Search
Type any domain name and get instant WHOIS data with registration details, expiry dates, and more.
Coverage
200+ supported TLDs
FAQ
Frequently asked questions
What TLDs are supported?
Over 200 TLDs including all major extensions like .com, .net, .org, .io, .ai, .dev, and many country-code TLDs.
Is my data private and secure?
Yes. All your data (favorites, search history, preferences) is stored locally on your device using the browser's secure storage API. No personal data or browsing history is collected.
Does it work on Firefox?
Yes! DomainToolBelt is available on both Chrome Web Store and Firefox Add-ons with the same feature set.
Ready to get started?
Install DomainToolBelt and start looking up domains in seconds.