Asking for a client: What are the IP address range(s) to whitelist for our Web Application Firewall so that the Qualys scanner won’t be blocked when attempting scans?
I am assuming your talking about the Qualys External scanners and you should find that via the help menu in your account.
You can try this range: Qualys External SOC: 188.8.131.52/20 (184.108.40.206-220.127.116.11)
But if you have doubts then you may want to contact your TAM.
Documentation and Training is available online:
The IP's are specific to the platform that you're using.
To know the IP's you'll need to whitelist, login to your Qualys account and click Help > About on the top-right.
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