Why can't I update my iOS?
If you're having trouble updated your Apple devices to the latest iOS, look here.
Click the Airport Extreme icon. The status window should pop up.
Click “Edit” and the setting window should appear.
Select the “Internet” Tab (see image below).
Primary - 18.104.22.168\ Secondary - 22.214.171.124
Click “Update” to apply the changes.
Open a web browser and enter “filtertest.netangel.com” This page should be blocked by NetAngel.