Hi Maxoq, There is no perfect tool as of now who provides 100% accurate information for bulk whois. If you go for individual website's whois information, then there are many services like whois.com providing correct information.
If you search on Google, you will find some tools who are claiming that they are providing bulk whois information but they provide only few information about that website and sometimes they show old information.
So, checking whois of any website doesn't take so long. You can search individual website information from reputed whois provider so that you always get updated information.