PS4 Ghosts RTE Mod Tool, and now @Modded Warfare is back with a guide on how to block PS4 updates on any PlayStation 4 Firmware from his YouTube Channel.
Those seeking a similar block list that covers more host names can also check HERE, and to quote from the video's caption: How to Block PS4 Updates On Any Firmware
How to simply block PS4 updates from being downloaded to your PS4 when you launch games or connect to the Internet.
If these addresses don't work please follow from 13:28 on the video. If your PlayStation 4 updates are blocked you'll receive a SU-30696-4 PS4 error code.
Additional Sony servers to block are also posted HERE covering more host names and regions, or see here if you're looking to Update to a Specific PS4 Firmware but not Sony's latest PlayStation 4 OFW.