Reachability

The Reachability sample application demonstrates how to use the System Configuration framework to monitor the network state of an iOS device. In particular, it demonstrates how to know when IP can be routed and when traffic will be routed through a Wireless Wide Area Network (WWAN) interface such as EDGE or 3G. Note: Reachability cannot tell your application if you can connect to a particular host

[KatagiriSo]

ネットワークReachability

[TaKUMA]

check whether the network is reachable or not

[hfu]

"The Reachability sample application demonstrates how to use the SystemConfiguration framework to monitor the network state of an iPhone or iPod touch"