Is it possible to know all of the domains registered by some individual or company using the free whois services on the internet?
A sort of "Reverese Whois"?
Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up.Sign up to join this community
There is no possibility to do this for free. There are services which will allow you to pay them in order to do a search like you want, but obviously they will only provide you with a list of domains if they actually have them indexed, and given how extensive the number of registered domains is, it may be hard to get an accurate list.
Yes, you can use Reverse Whois from http://www.whoisxmlapi.com/reverse-whois.php Finds all of the domains registered by some individual or company, not free, but the bulk lookup is cheap enough
Yes there are multiple ways to do this.
1) Search for the name of the person or email together with keyword 'whois' and sometimes that's enough to yield some results and let you go forward in your research
2) Through a website / API such as domainbigdata.com or domaintools.com. Domainbigdata is free, but domaintools have better data.
3) Some whois servers also allow to make this call directly from command line
4) Getting the "master record" for a given whois upon special request (this is what domainers use to harvest expired domain names).
When it comes to the "NIC handle" point, for country level you still often have a unique handle under which all your domains are and I think whois privacy is rare or at least far more rare at local .tld level e.g. .fi and records generally more straightforward to attain.