Groups > comp.lang.java.programmer > #34513

Re: Picking an unused port number

From	Arne Vajhøj <arne@vajhoej.dk>
Newsgroups	comp.lang.java.programmer
Subject	Re: Picking an unused port number
Date	2016-06-06 23:07 -0400
Organization	Aioe.org NNTP Server
Message-ID	<nj5dp0$o7d$1@gioia.aioe.org> (permalink)
References	(2 earlier) <nivsvj$hiq$1@jstuckle.eternal-september.org> <nj4ubq$t2e$1@dont-email.me> <nj55ri$get$1@jstuckle.eternal-september.org> <nj57vc$i9u$1@gioia.aioe.org> <nj58v1$n7t$1@jstuckle.eternal-september.org>

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On 6/6/2016 9:45 PM, Jerry Stuckle wrote:
> On 6/6/2016 9:28 PM, Arne Vajhøj wrote:
>> On 6/6/2016 8:52 PM, Jerry Stuckle wrote:
>>> On 6/6/2016 6:44 PM, Wayne wrote:
>>>> On 6/4/2016 8:50 PM, Jerry Stuckle wrote:
>>>>> On 6/4/2016 11:24 AM, nathanturner369@gmail.com wrote:
>>>>>>> So, in general, is there any rule you should use when selecting a
>>>>>>> port
>>>>>>> number, other than picking one > 1024?
>>>>>>
>>>>>
>>>>> Make it configurable, and > 4095, not 1024.
>>>>
>>>> Why?
>>>>
>>>
>>> Ports 0-4095 are reserved.
>>
>> ????
>>
>> 0-1023 are system ports
>> 1024-49151 are registered ports
>> 49152–65535 are ephemeral ports
>>
>> 80XX port numbers are very frequently used in the Java world.
>>

> If 1024-49151 are registered ports, then why would 80xx ports be used in
> the Java world?

Many possible reasons:
- they may have been assigned to the Java purpose
- they may have been assigned to a general purpose that is compatible 
with Java usage
- they may not have been assigned yet

> 0-4095 are generally considered "reserved" by commonly used protocols.
> Others are used by other protocols, but not generally considered "in use".

That is not how IANA looks at it.

Arne

Thread

Re: Picking an unused port number nathanturner369@gmail.com - 2016-06-04 08:24 -0700
  Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-04 09:56 -0700
    Re: Picking an unused port number Eric Douglas <e.d.programmer@gmail.com> - 2016-06-06 05:28 -0700
      Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-06 15:40 -0700
        Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-07 09:43 +0100
          Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-07 07:43 -0700
            Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-07 17:28 +0100
              Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-07 09:40 -0700
                Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-08 10:32 +0100
                Re: Picking an unused port number Eric Douglas <e.d.programmer@gmail.com> - 2016-06-08 06:45 -0700
                Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-08 15:06 +0100
                Re: Picking an unused port number Eric Douglas <e.d.programmer@gmail.com> - 2016-06-08 07:36 -0700
                Re: Picking an unused port number Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-08 18:03 +0000
  Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-04 20:50 -0400
    Re: Picking an unused port number Wayne <wayne@nospam.invalid> - 2016-06-06 18:44 -0400
      Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-06 20:52 -0400
        Re: Picking an unused port number Arne Vajhøj <arne@vajhoej.dk> - 2016-06-06 21:28 -0400
          Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-06 21:45 -0400
            Re: Picking an unused port number Arne Vajhøj <arne@vajhoej.dk> - 2016-06-06 23:07 -0400
              Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-07 09:50 -0400
                Re: Picking an unused port number Lew <lewbloch@gmail.com> - 2016-06-07 13:46 -0700
                Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-07 19:31 -0400
                Re: Picking an unused port number Lew <lewbloch@gmail.com> - 2016-06-07 17:26 -0700
                Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-07 21:34 -0400
                Re: Picking an unused port number Lew <lewbloch@gmail.com> - 2016-06-08 13:52 -0700
                Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-08 17:49 -0400
                Re: Picking an unused port number Arne Vajhøj <arne@vajhoej.dk> - 2016-06-07 21:53 -0400
        Re: Picking an unused port number a.laforgia@gmail.com - 2016-06-07 00:11 -0700

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