It looks like only Enterprise Plans show a log of NXDOMAIN requests. I see old subdomains and random probing in my log. I don’t see any risk, and no need for mitigation at the DNS level. The only concern is if there are requests for a subdomain you’ve forgotten about and accidentally deleted.
Thank you for the reply sdayman. I think being aware of that traffic could actually shed light on SEO issues if you have deleted a subdomain and noticed a jump in NXDOMAIN. It would be nifty if you could view that traffic, but I am going to have to wait on that one for now.
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