title: How to interpret the output of `nodetool status`?
body: <p>I run <code>nodetool status</code> on a Cassandra 2.0.3 instance, the output shows:</p>
  
  <pre><code>Datacenter: eu-west
  ===================
  Status=Up/Down
  |/ State=Normal/Leaving/Joining/Moving
  --  Address         Load       Tokens  Owns   Host ID                               Rack
  UN  xx.xxx.xxx.xxx  154.81 KB  256     33.8%  bcfb1057-60d7-4d94-b277-a1e8c0f55cf4  1a
  </code></pre>
  
  <p>I looked for all manuals available online, but none of them explains what <code>UN</code> means.</p>
  
  <p>What does the <code>UN</code> mean?</p>