From Wiki we can understand that PMNRF operates out of PMO, New delhi. So here are some consolidated information.
Donee PAN - AACTP4637Q
Address:
Prime Minister's National Relief Fund,
Prime Minister's Office,
South Block,
Raisina Hill
New Delhi - 110011
All donations to PMNRF are 100% tax exempted through 80G
Ref:
http://www.sarkaritel.com/com/pmo.php
www.pmnrf.gov.in
www.pmindia.nic.in
Disclaimer: I'm not responsible for the authenticity of the above information, readers are advised to verify through other sources, if required, before making any decisions.