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Apple's AirPort Utility allows your to manage your wi-fi network and AirPort base stations, including AirPort Express, AirPort Extreme, and Time Capsule directly from your iPad, iPhone, or iPod touch.
While this tool seems basic, it's actually very powerful. It allows you to see a graphical overview of your wi-fi network and get information about your connected devices. You can also view and change network and wi-fi settings, restart or restore a base station, access network information such as IP address, DNS servers, and router addresses, and even manage DHCP reservations and configure base stations for IPv6.
If you've invested in Apple hardware for your network, or you are responsible for Apple networks, this is a must-have app.
Download from iTunes.