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Scanning DHCP Networks /w Limited Subscription Count

Question asked by Craig Barretto on Feb 5, 2018
Latest reply on Feb 5, 2018 by Robert Dell'Immagine

How do others handle scanning DHCP networks and not blow through their IPs Purchased?

 

With other scanning tools, you can scan a subnet (eg. /24) and if 50 hosts are found, your license count is -50; however, with Qualys you need to do a MAP then scan (which is very manual). While this is ideal for one off scans, how are others automating this? For DHCP networks, a host could have 2-3 IPs in the same /24 in a given day/week. If we tell Qualys to scan the entire /24 we end up consuming 255 hosts in our subscription which isn't ideal when we have multiple DHCP networks. 

 

I guess to sum up, is Qualys IP Purchased done by Host or IP? I know this is a stupid question but during the scoping call with Qualys they ask how many hosts do you have in your environment. Wondering if we are just using the tool wrong.

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