Wireshark-dev: Re: [Wireshark-dev] How to avoid dissection based on port defined by a different
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From: Stephen Fisher <steve@xxxxxxxxxxxxxxxxxx>
Date: Thu, 16 Dec 2010 10:34:11 -0700
On Wed, Dec 15, 2010 at 02:55:38PM -0800, Dirk Jagdmann wrote:

> There is no port stealing. The IANA list is just a list, it does not 
> enforce anything or forbid other developers to choose one of these 
> ports for his service.
> 
> In addition not nearly every TCP/UDP application out there has tried 
> to register their port with IANA. If you've read the rules to do this 
> and have tried to register something with them, you might know that it 
> is often not worth the hassle.

If an application needs to use a port that isn't assigned for it, the 
"dynamic and/or private" range to use is 49,152 - 65,535.  See: 
http://www.iana.org/assignments/port-numbers