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Electronics/TCP/IP and UDP Port Numbers Nomenclature.

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Question
Dear ZZ

http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
http://www.webopedia.com/quick_ref/portnumbers.asp
http://www.stengel.net/tcpports.htm


1. As we see port numbers 4, 6, 8, 10, 12, 14, 16, 26, 40 ....
were kept as Unassigned, would like to know the reason for the same i.e. why those numbers were skipped ?.

2. If a new TCP/IP OR UDP Application or Service or protocol is designed and developed, Can we use these above Unassigned ports ?.

3. As we see the Maximum port number value is 61000, so If a new TCP/IP OR UDP Application or Service or protocol is designed and developed, Should we use 61001 as the port number ?.   


Thanks & Regards,
Prashant S Akerkar

Answer
I am not an expert on this topic.  I did some research and did not find an adequate answer.

It seems that there is not reason why those allocations cannot be used, but some say they are known for vulnerability by others who have been using them for insecure applications and it is merely a judgment call for not using them.

But, that is my guess.  Don't rely on this answer.  

Electronics

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Expertise

Electronics questions about AC, DC and digital theory.

Experience

Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

Organizations
IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

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BSEE University of North Dakota

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