Pakistan has blocked Wikipedia for hosting blasphemous content.
The move was announced on Saturday after the free online encyclopaedia was given a 48-hour deadline to remove some material.
The Pakistan Telecommunication Authority (PTA) said Wikipedia failed to comply with its ultimatum.
The Wikimedia Foundation, which hosts Wikipedia, said the ban meant Pakistanis would be denied access to the largest free knowledge repository.
Blasphemy is a highly sensitive and incendiary issue in Pakistan, a predominantly Moslem nation.
BBC reports that details of the material in question have not been revealed.
Other platforms including Tinder, Facebook and YouTube were previously blocked in the country.
Writing by Chinasa Ossai; Editing by Tony Okerafor