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Safe port number to use for custom purpose?

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linux-howto

http://www.unix.com – Hello, this is a really quick question that should be easy to answer. I want to forward a certain port through a firewall. I know 0-1024 are out of the question and 1024-49151 are considered "registered" ports and 49152-65535 are dynamic or private. I want to be sure I pick a port that won't ever be used by another application. So should I pick something in the 49152-65535 range or 1024-49151 range? I am guessing 1024-49151 but most of the servers in this network will be using this forwarded port so I don't want to run into the possibility of another application using the port I pick (HowTos)