Pakistan is monitoring seven major websites to block anti-Islamic content and links.
The Ministry of Information said Friday it is also outright blocking 17 other websites for alleged blasphemous material.
A Pakistan Telecommunication Authority spokesman, Khurram Mehran, said the sites that will be monitored are Yahoo, Google, YouTube, Amazon, MSN, Hotmail and Bing.
The measures follow Pakistan's temporary ban imposed on the popular social network website Facebook in May because of a controversial page that encouraged users to draw the Prophet Muhammad.
Most Muslims consider any images made of the prophet to be blasphemous.
The ban on Facebook drew both praise and condemnation in a country that has long struggled with how strict a version of Islam Pakistan should follow.
Some information for this report was provided by AP and Reuters.