About AirPort Utility for iOS
AirPort Utility for iOS, available in the App Store, has many of the same features as AirPort Utility for the Mac. You can use it to:
See a graphical overview of your Wi-Fi network.
Get information about your connected Wi-Fi devices.
View and change network and Wi-Fi settings.
View or update passwords for your network, base stations, or disks.
Restart or restore a base station, or update the firmware on a base station when available.
Easily access network information such as IP address, DNS servers, and router address.
Manage DHCP reservations and port mappings.
Configure base stations for IPv6.
View status or error messages.
Archive Time Machine backups.
Download AirPort Utility for iOS: If your iPhone or iPad is connected to your AirPort base station, go to Settings > Wi-Fi, tap the info icon 
next to your network’s name, tap Manage this Network, then tap OK to open the App Store and download AirPort Utility for iOS.
You can also open App Store from the Home screen and download AirPort Utility for iOS.