gistfile1.m

You'd have to add the Reachability code to your project http://developer.apple.com/library/ios/#samplecode/Reachability/Listings/Classes_Reachability_m.html#//apple_ref/doc/uid/DTS40007324-Classes_Reachability_m-DontLinkElementID_6 
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#import "Reachability.h"

+(NSString*)serverBaseURL {

if ([Reachability reachabilityWithHostName:@"macbook.local"].currentReachabilityStatus != NotReachable) {
	return @"macbook.local";
}

if ([Reachability reachabilityWithHostName:@"macdesktop.local"].currentReachabilityStatus != NotReachable) {
	return @"macdesktop.local";
}

return @"productionURL.com";
}