Pakistan will start monitoring seven major websites, including Google and Yahoo, for content it deems offensive to Muslims.
YouTube, Amazon, MSN, Hotmail and Bing will also come under scrutiny, while 17 less well-known sites will be blocked.
Officials will monitor the sites and block links deemed inappropriate.
In May, Pakistan banned access to Facebook after the social network hosted a "blasphemous" competition to draw the prophet Muhammad.
The new action will see Pakistani authorities monitor content published on the seven sites, blocking individual pages if content is judged to be offensive.
Telecoms official Khurram Mehran said links would be blocked without disturbing the main website.
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