Having NTN and paying the tax is not enough. You have to file an annual statement of income tax deposit called return. Once you file the return your name is included in the taxpayers' database or list.
Also you can file the tax returns online. Go to FBR website and there you will find all the info. If you need more info call their helpline in working hours.
On the website you will also file the active tax payers' list or directory. You can download it. It is in PDF format.