Do you block "new" domain names?, (Tue, Feb 4th)

This is more a quick question then a full post: Many attacks use recently registered domain names. Do you block newly registered domain names (lets say for the first week)? What system do you use to do so? I am thinking about setting up a simple API to return a "days registered" for a domain name, but first want to see what else is out there.

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Johannes B. Ullrich, Ph.D.
SANS Technology Institute
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