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Block specific porn websites. If you have a specific porn site that you want to block, move down the Websites settings screen and tap “Add a Website” under the Never Allow section. Type in the web address or URL you want to block on the pop up menu, and no one will ever be able to visit that website using your iPhone. The OpenDNS website has a complete guide on how to block porn on PC (Windows 10/7) by setting up a family-friendly DNS. iOS: Block Adult Websites on the iPhone and iPad by Changing DNS. Changing DNS settings for an iOS 11 device and later is quite easy.