title: Meaning of localhost:dsf
body: <p>I am working on a Python Server application that runs on 127.0.0.1 : 555 and I am trying to show the port 555 on lsof, or netstat. My system is macOS and when I type </p>
  
  <p><code>sudo lsof | grep localhost</code> </p>
  
  <p>on terminal, I cannot see the port as localhost:555 instead the end of the output looks like:  </p>
  
  <p><code>... TCP localhost:dsf (LISTEN)</code></p>
  
  <p>Can someone help me about what 'dsf' means and is there any way to show the port 555?</p>
  
  <p>Thank you.</p>