Steps to be followed:
Open the link of GST i.e. https://gst.gov.in , and then go to Search Taxpayer option; fill your GSTIN/UIN no. from where you will get all the details of the Taxpayer including Central jurisdiction and State jurisdiction.
The Jurisdiction which is shown in RED Colour is the actual taxable jurisdiction of the Taxpayer. Example shown below: Centre is the taxable authority.
Further, you may also check user Services under Services icon of this portal to find out address of the concerned Tax Officer. These two options under Search icon i.e. Contacts, and Search office addresses provides you the details of Officer in relation to desired jurisdiction.