Best TCP port number range for internal applications [closed]

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I decided to download the assigned port numbers from IANA, filter out the used ports, and sort each “Unassigned” range in order of most ports available, descending. This did not work, since the csv file has ranges marked as “Unassigned” that overlap other port number reservations. I manually expanded the ranges of assigned port numbers, leaving me with a list of all assigned port numbers. I then sorted that list and generated my own list of unassigned ranges.

Since this stackoverflow.com page ranked very high in my search about the topic, I figured I’d post the largest ranges here for anyone else who is interested. These are for both TCP and UDP where the number of ports in the range is at least 500.

Total   Start   End
829     29170   29998
815     38866   39680
710     41798   42507
681     43442   44122
661     46337   46997
643     35358   36000
609     36866   37474
596     38204   38799
592     33657   34248
571     30261   30831
563     41231   41793
542     21011   21552
528     28590   29117
521     14415   14935
510     26490   26999

Source (via the CSV download button):

http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

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