title: How does the iOS Reachability class work, and why the IP Address 169.254.0.0?
body: <p>How does the iOS Reachability class work, and what's so special about the IP Address 169.254.0.0? </p>
  
  <p>I'm trying to figure out whether Wi-Fi is on, independent of whether it is connected to an actual Wi-Fi network or not. </p>
  
  <p>I haven't found a satisfactory answer for this question on SO, and even the answers that try to answer this don't work for me. </p>