How to Search GSTINs by PAN
On gst.gov.in, open Search Taxpayer → Search by PAN, enter the PAN and the captcha. It lists every GSTIN registered under that PAN, one for each state where the business is registered, with its status. This tool does not search by PAN; it verifies one GSTIN at a time.
You can also read the PAN from any GSTIN: characters 3 to 12 are the PAN, the first two digits are the state code, and the 13th shows how many registrations the PAN has in that state. Type a GSTIN above to see its PAN, state and who holds it, such as an individual, company or firm.