I'm running ios11 beta 5 ( ipad) which is pretty close to the final version. Most of browsers are leaking excepted 4 (Safari, Firefox, Seiphnir and Yandex) "Privacy focused" browsers are leaking too and you can see your local IP on Whoer.net with Firefox Focus, Brave, Ghostery etc.. Dolphin, Opera and Opera Coast are leaking too , but it's not a surprise ! when you will update your ipad or phone to Ios 11 , please be carreful and test your browers before using them till they fix the problem. PS and out of topic. I've found a fantastic util : ad block , anti adblock trackers block, Cookies manager, Domain block, script block etc... called 1Blocker, worth every penny.