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CFHost allows you to asynchronously resolve a name or address without the main thread blocking. CFNetwork will spawn the thread for you in the background and fire a notification back to the main thread once it acquires the information.

-(void)connectTo: (NSString *)address { BOOL success = NO;

CFHostClientContext hostContext;

hostContext.version = 0; = self;
hostContext.retain = nil;
hostContext.release = nil;
hostContext.copyDescription = nil;

CFStreamError error;

CFHostRef host = CFHostCreateWithName(kCFAllocatorDefault, (CFStringRef)address);
success = CFHostSetClient(host, _network_host_callback, hostContext);
CFHostScheduleWithRunLoop(host, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);

success = CFHostStartInfoResolution(host, kCFHostAddresses, &error); }