If you have only the PAN No. and you Want to know the Full Name of PAN Holder. follow this route. i don't know it is ethical or not, but i came to know it by accident.

1) Go to this site by click on this link https://onlineservices.tin.nsdl.com/etaxnew/Index.html

2) a list will appear with Bank Names just click at the end on the "Please Click Here " Button provided on that page.

3) a New Screen will appear with list of Different Challan Nos. Just click on
CHALLAN NO./ITNS 280
(payment of Income tax & Corporation Tax)

4) you will see a blank Challan to Fill,

5) First Choose Company or Non Company Just Clicking on
(0020)INCOME-TAX ON COMPANIES(CORPORATION TAX)

or
(0021)INCOME-TAX (OTHER THAN COMPANIES)

6) Type PAN No., Assessment Year (e.g. 20010-11),

7) you can see there are some * marked cells that you need to fill,

they are

"Full Name" (you can fill anything here)

"City/District" (you can fill anything here)

"State" (this is drop down menu, you can select e.g. Delhi here. (whose pin code you knows)

"PIN" (type 110001 for Delhi this is just example you can fill any zip code which exist in Delhi)

"Type of Payment" (Just click on "Self Assessment Tax")

"Bank Name" (select any bank from dropdown menu)

Click on "Proceed" button which you can see below

8) an Error message with correct details of pan will apper (That the what you want to know.)

This is the messeage which will appear after the above procedure.

For PAN 'AETPG1970L' given by you above, the name as per Income Tax Department database is 'ATUL GERA'. Tax credit will be effected to the said PAN name.

Hope the above information is helpful.

Thanks

Praveen