I agree with @vsys_remo Seems really burdensome to have to track, catalog, and account for the age of a new domain. Only to have it moved to an already existing category (Unknown) after 24 hours.
Maybe a better way would be to try to enhance PAN-DB's or Brightcloud's "live/on the spot" categorization functionality?
The unknown catagory: The website has not yet been categorized, so it does not exist in the URL filtering database on the firewall or in the URL cloud database.
This covers a percentage of what would fall under the <24/48 life span window of a new domain, however you still run the issue of it just being a domain that hasn't been injected in the URL DB but could have been online for sometime.
Also we are really interested in the "Last registared date" not the original. This should be an easy implementation as it seems like a simpler catagory to implment based on the availability of the information over some of the more complex categories that require a more time consuming process to classify.
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