In order to let WorkCron connect to a particular IP to execute a cron job, you can

  1. use the particular IP (instead of your domain name) in your URL, and
  2. put your domain name in the "HTTP" tab -> "HTTP headers" field.

For example, if your cron job URL is https://www.example.com, the particular IP is 93.184.216.34. You should add https://93.184.216.34 as cron job URL, and in the "HTTP" tab -> "HTTP headers" field, add Host: www.example.com.

In this way, WorkCron will use the specified IP (and the domain name) to connect to your website and execute the cron job on the server bound with that IP.