blocks|key|2749119|text|在现代linux上，使用ss+(socket+stats)实用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749120|$+ss+-s
Total:+10160+(kernel+10262)
TCP:+++10349+(estab+8886,+closed+408,+orphaned+0,+synrecv+0,+timewait+393/0),+ports+3147

Transport+Total+++++IP++++++++IPv6
*+++++++++10262+++++-+++++++++-++++++++
RAW+++++++0+++++++++0+++++++++0++++++++
UDP+++++++5+++++++++5+++++++++0++++++++
TCP+++++++9941++++++9941++++++0++++++++
INET++++++9946++++++9946++++++0++++++++
FRAG++++++0+++++++++0+++++++++0++++++++|code-block|syntax|javascript|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|I|8|@]|9|@]|A|$E|F]]]|G|$]]

On modern linux, use the ss (socket stats) utility.

<pre><code>$ ss -s
Total: 10160 (kernel 10262)
TCP: 10349 (estab 8886, closed 408, orphaned 0, synrecv 0, timewait 393/0), ports 3147

Transport Total IP IPv6
* 10262 - - 
RAW 0 0 0 
UDP 5 5 0 
TCP 9941 9941 0 
INET 9946 9946 0 
FRAG 0 0 0 
</code></pre>

blocks|key|455046|text|netstat+-an+%7C+grep+ESTABLISHED+%7C+wc+-l|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|455047|会给你开放端口的数量，在我的情况下是32个。|unstyled|455048|cat+/proc/sys/net/ipv4/ip_local_port_range|455049|将返回如下内容：|455050|32768+61000|blockquote|455051|这意味着61000+-+32768+-+$OPENPORTS+=+AvailablePorts|455052|在我的盒子里：|455053|61000-32768-32+=+28200可用端口号。|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|Y|8|@]|9|@]|A|$]]|$1|N|3|O|5|F|7|Z|8|@]|9|@]|A|$]]|$1|P|3|Q|5|F|7|10|8|@]|9|@]|A|$]]|$1|R|3|S|5|F|7|11|8|@]|9|@]|A|$]]]|T|$]]

<pre><code>netstat -an | grep ESTABLISHED | wc -l
</code></pre>

will give you the number of open ports, 32 in my case.

<pre><code>cat /proc/sys/net/ipv4/ip_local_port_range
</code></pre>

Will return something like: 

<blockquote>
 32768 61000
</blockquote>

which means, 61000 - 32768 - $OPENPORTS = AvailablePorts

On my box, thats:

61000-32768-32 = 28200 available port numbers.

blocks|key|2748956|text|正如其他人所提到的，netstat是用来确定当前正在使用的端口的工具。至于限制，可用端口数是一个16位无符号整数，它给您的范围为0-65535。可供应用程序绑定的端口是保留的特权/根端口(0-1024)，再加上临时端口范围中没有涵盖的端口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2748957|您可以通过运行cat+/proc/sys/net/ipv4/ip_local_port_range查看您的临时端口。|offset|length|style|CODE|2748958|要持久地修改它，您必须在/etc/sysctl.conf文件中添加/修改"net.ipv4.ip_local_port_range“，或者与sysctl+-n+net.ipv4.ip_local_port_range="<start_port>+<end_port>"交互|entityMap^0|0|7|16|0|1Y|1S^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@$D|M|E|N|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]]|J|$]]

As others have mentioned, netstat is the tool to use to determine what ports are in use currently. As to the limits, the number of ports available are a 16bit unsigned integer which gives you the range 0-65535. The ports that are available for applications to bind to are the reserved privileged/root ports (0-1024) plus whatever is not covered by your ephemeral port range.

You can view your ephemeral ports by running <code>cat /proc/sys/net/ipv4/ip_local_port_range</code>.

To modify that persistently, you would have to add/modify "net.ipv4.ip_local_port_range" in the /etc/sysctl.conf file, or interactively with <code>sysctl -n net.ipv4.ip_local_port_range="&lt;start_port&gt; &lt;end_port&gt;"</code>

blocks|key|454976|text|就我个人而言，我更喜欢nmap。您可以通过发出nmap+-P+1-65535目标来查找所有端口的状态。大多数发行版都应该通过它们的包管理器提供这个包。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

Personally I prefer nmap. You can find the state of all ports by issuing nmap -P 1-65535 target. Most distributions should have this package available via their package manager.

blocks|key|2749154|text|试一试|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749155|#+lsof+-n+-i+-P+|code-block|syntax|javascript|2749156|(为完整起见:)|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|L|8|@]|9|@]|A|$]]]|I|$]]

Try 

<pre><code># lsof -n -i -P 
</code></pre>

For completeness sake :)

blocks|key|454869|text|netstat将允许您查看哪些端口是打开的，请执行"netstat+-“以查看哪些端口最适合您的需要。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

netstat will allow you to see what ports are open, do "netstat -" to see what fits your needs best.

blocks|key|454988|text|‘'nmap+localhost’将为您提供在它们上运行的所有开放端口和服务。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

'nmap localhost' will give you all your open ports and services running on them.

blocks|key|455075|text|netstat+-tulnp|type|unstyled|depth|inlineStyleRanges|entityRanges|data|455076|netstat程序的参数列示如下：|455077|*

++t+-+Show+TCP
*

++u+-+Show+UDP
*

++l+-+Show+only+listening+processes+(netstat+can+show+both+listening+and+all+established+connections,+i.e.+as+a+client+too)
*

++n+-+Do+not+resolve+network+IP+address+names+or+port+numbers
*

++p+-+Show+the+process+name+that+is+listening+on+the+port|code-block|syntax|javascript|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$G|H]]]|I|$]]

netstat -tulnp

The arguments to the netstat program are listed below:

<pre><code>*

 t - Show TCP
*

 u - Show UDP
*

 l - Show only listening processes (netstat can show both listening and all established connections, i.e. as a client too)
*

 n - Do not resolve network IP address names or port numbers
*

 p - Show the process name that is listening on the port
</code></pre>

blocks|key|2749188|text|在终端上使用以下命令检查所有端口|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749189|netstat+-lntu|code-block|syntax|javascript|2749190|若要查看特定端口状态，请使用以下命令|2749191|netstat+-an+%7C+grep+':6060'|2749192|用您的特定端口号替换6060。|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|O|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|R|8|@]|9|@]|A|$]]]|M|$]]

use the following command on terminal to check all ports

<pre><code>netstat -lntu
</code></pre>

To see a specific ports status use the following command

<pre><code>netstat -an | grep ':6060'
</code></pre>

replace 6060 with your specific port number.

How to find the number of open ports in linux? I want to see if I am running out of ports. Also, how do I see the limit of my OS?

How to find the number of open ports in linux?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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如何在linux中找到开放端口的数量？我想看看我是不是没有港口了。另外，我如何看待我的操作系统的极限？

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