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Well known ports and optimal ports scanning range

Last Modified: 2017-03-22
When security port scanning a very large number of machines, what is the optimal range of ports to scan?
While the well known port range is something like 1-1024, there are many services which exist in the 4 digit range.
Is there a secondary 'well known' range which isn't as large the as full 64K range which takes much too long.
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