Try 1 3 3 7 x . G d, it is usually blocked
It is opening now.For some reasonyifysub.netis blocked on Excitel now.
Same is the case with JioFiber. On certain IP range, most of the websites are unblocked.My understanding is the it is mostly based on the public ip range you get.
In some paths the middleboxes block such websites. Whereas in case of different ip it takes a different path where middleboxes are not there hence works fine.