What is NTN? NTN is National Tax Number, and for every business owner, it is mandatory to get their ntn registered in FBR. The process is simple, but if you are not familiar with the process, NAZ INTELLECTUAL SERVICES is offering free services OF ntn registration, copyright, trade mark and patent registration services in Karachi, Lahore, Islamabad and all cities in Pakistan. so now you don't have to worry about any hectic or stressfull process