A few days ago I started getting "server could not be found" messages when using safari on my ipad. I picked up my iphone to try the same pages and it didn't work on my iphone either. I can open these pages on my pc or my husbands samsung phone so?

A few days ago I started getting "server could not be found" messages when using safari on my ipad. I picked up my iphone to try the same pages and it didn't work on my iphone either. I can open these same pages on my pc or my husbands samsung phone so it must be an Apple problem. All other non-Apple devices in our home can open up these pages with no problem but the Apple products all of a sudden can't seem to open them...help!