TLDR;

Indian ISP ACT Fibernet (aka Beam Telecom) hijacks its users’ DNS requests (even when using public DNS servers like Google or OpenDNS) and blocks websites through this method. This has huge implications beyond website blocking and you can’t rely on anything that you are browsing anymore though there are ways available to make yourself safe.

Aside: Indian ISPs are blocking benign/collateral damage sites now like bit.ly for ACT and behance.net for Airtel. Pretty soon most of web will be blocked in India at this rate.