wao.io adds a WAO header line to the request to your origin server in order to let you easily identify requests from wao.io. It follows the same syntax as the HTTP Via header line. Here's an example: 

WAO: 1.1 wao.io

or

WAO: 2 wao.io

 

Our IP ranges are:

  • 87.79.3.0/24
  • 62.216.162.0/26
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