- Verify a CBIC DIN on the official CBIC website, cbic.gov.in ("Verify CBIC-DIN").
- Verify a GST-portal RFN at services.gst.gov.in.
- Never pay a demand into a personal account — only through the official GST portal challan.
- If it is fake, do not click any link. Report it on cybercrime.gov.in or call 1930.
Not sure? Paste the notice into the free GST notice checker — it flags these signals in seconds, entirely in your browser.