1) It's FREE.
2) It supports almost all gTLDs, ccTLDs and IDNs.
3) It offers Bulk Whois Lookup to check the same domain name in other top TLDs.
4) It offers parsing support of almost all registrars, which gives you important information like registrar, status, date registered, expiration date,owner and contact email address, etc.
5) It offers Reserve Whois Lookup to find out all the domains ever owned by any specific company or individual.
6) Its Whois History gives you access to the most comprehensive archive of historical Whois records.
4.CN is a global professional marketplace for buying and selling domain names. There are over 1,600,000 domains in our marketplace. Currently we are the leading domain auction platform and the leading domain escrow service provider in China. Learn more at 4.cn.
* Now support autocomplete feature.
* You can search, visit, share or email the registrant, registrant organization or email address in whois overview.
* Move 'Recent Queries' to Left-Slide menu.
* You can reverse whois lookup by custom keyword, and filter the result by Tld.
* Added feedback, language, timeout options in Settings.
* Fixed crash issue on Wifi only devices.
* Various Bug/UI & Performance Fixes