Electronics/TCP/IP and UDP Port Numbers Nomenclature.
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
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.