title: Find heroku dyno ip
body: <p>My Heroku app has a single dyno, and it accesses external resources such as database\cache\web-services\etc?</p>
  
  <p>The dyno IP address is not static and may change, but not very often. When you perform maintenance of these resources, it's often useful to know which IP is associated to which client, even if it's ad-hoc. Therefore...</p>
  
  <p><strong>How can I ad-hoc know what IP address would the dyno access the resources from?</strong></p>