Gst number on board

 As per rule 18{2} of the CGST rules 2017 , every registered person shall  display his GSTN  on the name board exhibited  at entry of his principal  place of  Business and  at every  additional  place or places  of business .

in addition  that  registration certificate  should  be at  prominent location  at his principal  place and  additional  place of  Business 

refer rule 18 of the CGST rule