SCNetworkReachability only works for domain names?

Given iOS's SCNetworkReachability API configured like this:

SCNetworkReachabilityRef reachabilityRef = SCNetworkReachabilityCreateWithName(N开发者_C百科ULL, "example.com");
SCNetworkReachabilityContext context = {0, self, NULL, NULL, NULL};
SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context);
SCNetworkReachabilitySetDispatchQueue(reachabilityRef, dispatch_queue);

It works nice if I configure it with a domain name as in the example above. However, if I configure it with an IP address the callback is never called.

Anyone can confirm that this is the expected behavior of the SCNetworkReachability API? If so, any clues why?

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Try using SCNetworkReachabilityCreateWithAddress instead of SCNetworkReachabilityCreateWithName.

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Use eppz!reachability that works well with IP addresses, too. Simple usage like:

// Get status on-demand.
[EPPZReachability reachHost:@"eppz.eu"
               completition:^(EPPZReachability *reachability)
{
    if (reachability.reachable) [self postSomething];
}];

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It is true. It won't work nor with SCNetworkReachabilityCreateWithAddress (It actually works on future reachability condition changes, but the first callback never get called).

If you design needs only on-demand reachability check, consider using SCNetworkReachabilityGetFlags.

A bit more at: Why asynchronous reachability with IP address doesn’t work? and Reachability with blocks for everyday use