blocks|key|1742234|text|转到here并选择一个描述为Unassigned的端口|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1742235|entityMap|0|LINK|mutability|MUTABLE|url|http://www.iana.org/assignments/port-numbers^0|E|A|2|4|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Go <a href="http://www.iana.org/assignments/port-numbers" rel="noreferrer">here</a> and pick a port with the description <code>Unassigned</code>

blocks|key|1742287|text|第一步:查看IANA+listing：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1742288|您将在列表的末尾看到|1742289|“动态和/或专用端口是从49152到65535的端口”|1742290|因此，这些可能是你更好的选择，但一旦你选择了一个，你总是可以在上面搜索一下，看看是否有足够受欢迎的应用程序已经“认领”了它|1742291|entityMap|0|LINK|mutability|MUTABLE|url|http://www.iana.org/assignments/port-numbers^0|6|C|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

First step: look at <a href="http://www.iana.org/assignments/port-numbers" rel="noreferrer">IANA listing</a> : 

There you will see at the tail of the list 

"The Dynamic and/or Private Ports are those from 49152 through 65535" 

so those would be your better bets, but once you pick one you could always google on it to see if there is a popular enough app that has already "claimed" it

blocks|key|1743181|text|如果您所说的广泛使用是指您想要防止其他人在将来使用它，您可以申请通过IANA+here将其标记为保留给您的应用程序|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1743182|entityMap|0|LINK|mutability|MUTABLE|url|http://www.iana.org/cgi-bin/usr-port-number.pl^0|13|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If by widely-used, you mean you want to protect against other people using it in the future, you can apply to have it marked as reserved for your app by IANA <a href="http://www.iana.org/cgi-bin/usr-port-number.pl" rel="noreferrer">here</a>

blocks|key|1527523|text|据我所知，最全面的官方IANA端口号和非官方端口号列表是nmap-services。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1527524|entityMap|0|LINK|mutability|MUTABLE|url|http://nmap.org/data/nmap-services^0|S|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The most comprehensive list of official IANA port numbers and non-official port numbers I know is <a href="http://nmap.org/data/nmap-services" rel="noreferrer">nmap-services</a>.

blocks|key|1742485|text|您可能希望避免使用来自this+list+(维基百科)的任何端口。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1742486|我只需要选择一个，一旦应用程序被大众使用，端口号就会被识别并包含在这样的列表中。|1742487|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers^0|B|9|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

You probably want to avoid using any ports from <a href="http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers" rel="nofollow noreferrer">this list</a> (Wikipedia).

I would just pick one, and once the app is used by the masses, the port number will become recognized and included in such lists.

blocks|key|1743228|text|从IANA列表中选择一个未分配的通常就足够了，但如果您谈论的是商业发布的产品，您真的应该向IANA申请一个分配给您的产品。请注意，这样做的过程很简单，但速度很慢；我上次申请的时候，花了一年的时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1743229|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Choosing an unassigned one from the IANA list is usually sufficient, but if you are talking about a commercially-released product, you really should apply to the IANA to get one assigned to you. Note that the process of doing this is simple but slow; the last time I applied for one, it took a year.

blocks|key|1743319|text|正如其他人所提到的，请查看IANA。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1743320|然后检查您的本地系统/etc/services，看看是否有一些自定义端口正在使用。|1743321|请不要硬编码它。以某种方式确保它是可配置的--如果没有其他原因，您希望能够让多个开发人员同时使用他们自己的本地化构建。|1743322|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

As others mention, check IANA.

Then check your local systems /etc/services to see if there are some custom ports already in use.

And please, don't hardcode it. Make sure it's configurable, someway, somehow -- if for no other reason that you want to be able to have multiple developers using their own localized builds at the same time.

blocks|key|1528240|text|如果这是一个你期望被广泛使用的应用程序，那么注册一个数字here，这样其他人就不会使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1528241|否则，只需随机选择一个未使用的。|1528242|在动态范围内使用1的问题是它可能不可用，因为它可能正用于动态端口号。|1528243|entityMap|0|LINK|mutability|MUTABLE|url|http://www.iana.org/cgi-bin/usr-port-number.pl^0|S|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

If this is for an application that you expect to be used widely, then register a number
<a href="http://www.iana.org/cgi-bin/usr-port-number.pl" rel="nofollow noreferrer" title="here">here</a> so no-one else uses it.

Otherwise, just pick an unused one randomly.

The problem with using one in the dynamic range is that it may not be available because it may be being used for a dynamic port number.

blocks|key|1742449|text|您可以引用一些常用的端口号here，尽量不要使用其他任何人的端口号。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1742450|如果您所说的“向公众开放”是指在您自己的系统上打开端口，我会与您的系统管理员讨论他们对使用哪些端口感到满意。|1742451|entityMap|0|LINK|mutability|MUTABLE|url|http://www.iana.org/assignments/port-numbers^0|D|4|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Well, you can reference some commonly used port numbers <a href="http://www.iana.org/assignments/port-numbers" rel="nofollow noreferrer">here</a> and try not to use anyone else's.

If by "open to the public at large" you mean you're opening ports on your own systems, I'd have a chat with your system administrators about which ports they feel comfortable with doing that with.

blocks|key|1527461|text|选择一个不是very+common的号码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1527462|entityMap|0|LINK|mutability|MUTABLE|url|http://www.governmentsecurity.org/articles/CommonPorts.php|1|http://www.iana.org/assignments/port-numbers^0|6|4|0|B|6|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Choose a number that is not <a href="http://www.governmentsecurity.org/articles/CommonPorts.php" rel="nofollow noreferrer">very</a> <a href="http://www.iana.org/assignments/port-numbers" rel="nofollow noreferrer">common</a>

blocks|key|1528270|text|选择一个不会干扰最常见的守护进程和服务器的默认端口。还要确保端口号不会被列为某些病毒的攻击媒介--一些公司有严格的策略，无论发生什么情况都会阻止这些端口。最后但并非最不重要的一点是，确保端口号可配置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1528271|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Choose a default port that doesn't interfere with the most common daemons and servers. Also make sure that the port number isn't listed as an attack vector for some virus -- some companies have strict policies where they block such ports no matter what. Last but not least, make sure the port number is configurable.

blocks|key|1528337|text|使用iana列表。从以下位置下载csv文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1528338|https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv|offset|length|1528339|并使用此shell脚本搜索未注册的端口：|1528340|for+port+in+{N..M};+do+if+!+grep+-q+$port+service-names-port-numbers.csv;+then+echo+$port;fi;+done;|code-block|syntax|javascript|1528341|用2个数字代替N和M。|1528342|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2I|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|12|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|C]]]]

Use iana list. Download the csv file from :

<a href="https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv" rel="nofollow noreferrer">https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv</a>

and use this shell script for searching for unregistred ports:

<pre><code>for port in {N..M}; do if ! grep -q $port service-names-port-numbers.csv; then echo $port;fi; done;
</code></pre>

and put 2 numbers instead of N and M.

When developing an app that will listen on a TCP/IP port, how should one go about selecting a default port? Assume that this app will be installed on many computers, and that avoiding port conflicts is desired.

How should one go about choosing a default TCP/IP port for a new service?

服务器

在开发侦听TCP/IP端口的应用程序时，应该如何选择默认端口？假设此应用程序将安装在多台计算机上，并且希望避免端口冲突。

问应该如何为新服务选择默认的TCP/IP端口？
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问应该如何为新服务选择默认的TCP/IP端口？EN

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问应该如何为新服务选择默认的TCP/IP端口？
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