If you want to register free domain name for 1 year doing some R&D purpose then read this article here I am going to share website from where you can book unlimited free domain names for 1 year validity, Some kinds of domains like .TK .CF .GA .GQ .ML are available for free at Freenom.com, but there are limitations on what you can do with these domains http://www.freenom.com/en/freeandpaiddomains.html However, .com domains are not free to get as domain registrars have to pay ICANN for every domain they register or renew it. But If you want to do some research related work then these free domain are quite good and useful.
Registering Free Domain Names
Follow below steps to register free domain name for 1 year period.
Step 1: Go to the Freenom homepage: www.freenom.com
Step 2: On the home page you will be able to type in the domain name you would like to register in the ‘Find a new Free domain’ field.
Step 3: Then click ‘Check Availability’.
Step 4: If the domain name is available click ‘Select’ and then select ‘Checkout’.
Step 5: You will then be given the option to forward the domain or use DNS. You will be able to select how long you want to register the domain name by selecting the dropdown menu below ‘Period’. Choose the period you would like to register for.
Step 6: To create a new account, enter your email address and click ‘Verify My Email Address’ to continue to the next step.
If you are already registered select ‘Click here’ to login and complete the domain registration to your existing account.
Note: These free domain names available free for one year only after one year you have to pay domain registration fees. I recommend use these free domain names just for R&D purposes.