I'd like to monitor our company's public IP space (several /24s) to track what ports are open, over time, across the entire IP address space. I don't want to home-roll a solution, I would rather pay for it.
I also don't want the full suite of vulnerability scanning. I really just want to know that any given public IP had port 443 open yesterday, but today it has port 443 and 80 open. And whenever there is a change like that, to get an alert of some type.
I think this could all be scripted in Linux using nMap, but as I mentioned I'd prefer a SaaS solution. Most of the solutions I have found online seem like they are going to include a lot of additional capability that will drive the price.
Can anyone recommend some SaaS that can do this for us?
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