Pincodes DataSource from IndianGovernment (proposed by Siemens):
https://data.gov.in/catalog/locality-based-pincode
Locality based Pincode contains all the pin-code list across India with information like State, District, sub district, village, locality and Office Name. Postal Index Number (PIN) or PIN Code is a 6 digit code of Post Office numbering used by India Post. The PIN was introduced on August 15, 1972. There are 9 PIN regions in the country.
____
Currently the DataSource does only provide full-datasets until 2017, but maybe the API or similar Sources do provide further information.
Currently waiting for an answer by Indian.gov if more recent Data is available, will keep you posted.