title: How do I create instance of NSHost from IP address?
body: <p>Apologies- i'm new to xcode/cocoa/objective-c... </p>
  
  <p>I'm struggling to understand what is wrong with:</p>
  
  <pre><code>NSHost *host = [NSHost hostWithAddress:@"192.168.0.155"];
  </code></pre>
  
  <p>I'm receiving 2 errors"</p>
  
  <pre><code>No known class method for selector 'hostWithAddress:'
  Receiver 'NSHost' for class message is a forward declaration
  </code></pre>
  
  <p>Could you help explain the errors and how I can achieve the simple task of creating an instance of NSHost pointing to 192.168.0.155.</p>
  
  <p>Thanks</p>
  
  <p>Lee</p>