Well now, no more thing to say but the same thing is also there on service tax registration website. First go for the registration process means give fake names and get password and then go to fill ST-1. And there in pan card options select alloted and give the PAN No. and it will automatically show the name of the person exactly registered with IT department. Well, I have discovered this while my office members were facing difficulty to find out the correct name of the person for registration on income tax website for filling e-return. Above steps are very easy to follow just try once.