blocks|key|1282512|text|您似乎正在寻找一种端口扫描程序，例如nmap或netcat，这两种扫描程序都可用于Windows、Linux和Mac。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1282513|例如，检查已知ip上的telnet：|1282514|nmap+-A+192.168.0.5/32+-p+23|code-block|syntax|javascript|1282515|例如，查找host.example.com上从20到30的开放端口：|1282516|nc+-z+host.example.com+20-30|1282517|entityMap|0|LINK|mutability|MUTABLE|url|http://nmap.org/|1|http://netcat.sourceforge.net/^0|I|4|0|N|6|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]|$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|18|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]]]

You seem to be looking for a port scanner such as <a href="http://nmap.org/" rel="noreferrer">nmap</a> or <a href="http://netcat.sourceforge.net/" rel="noreferrer">netcat</a>, both of which are available for Windows, Linux, and Mac OS X.

For example, check for telnet on a known ip:

<pre><code>nmap -A 192.168.0.5/32 -p 23
</code></pre>

For example, look for open ports from 20 to 30 on host.example.com:

<pre><code>nc -z host.example.com 20-30
</code></pre>

blocks|key|1282542|text|nc或'netcat‘也具有可能有用的扫描模式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1282543|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|$]]

nc or 'netcat' also has a scan mode which may be of use.

blocks|key|1497362|text|在命令提示符下，可以使用命令telnet..例如，要使用端口80连接到IP+192.168.10.1，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1497363|telnet+192.168.10.1+80|code-block|syntax|javascript|1497364|在Windows7和更高版本的click中启用远程登录。从链接的文章中，通过控制面板->程序和功能和windows功能->+telnet客户端启用telnet，或者只需在管理提示符下运行以下命令：|offset|length|1497365|dism+/online+/Enable-Feature+/FeatureName:TelnetClient|1497366|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rootusers.com/how-to-enable-the-telnet-client-in-windows-10/^0|0|0|F|5|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

In Command Prompt, you can use the command telnet..
For Example, to connect to IP 192.168.10.1 with port 80,

<pre><code>telnet 192.168.10.1 80
</code></pre>

To enable telnet in Windows 7 and above <a href="https://www.rootusers.com/how-to-enable-the-telnet-client-in-windows-10/" rel="noreferrer">click</a>. From the linked article, enable telnet through control panel -> programs and features -> windows features -> telnet client, or just run this in an admin prompt: 

<pre><code>dism /online /Enable-Feature /FeatureName:TelnetClient
</code></pre>

blocks|key|1497394|text|使用nc命令，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1497395|nc+-zv+<hostname/ip>+<port/port+range>

For+example,
nc+-zv+localhost+27017-27019
or
nc+-zv+localhost+27017|code-block|syntax|javascript|1497396|您也可以使用telnet命令|1497397|telnet+<ip/host>+port|1497398|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Use nc command,

<pre><code>nc -zv &lt;hostname/ip&gt; &lt;port/port range&gt;

For example,
nc -zv localhost 27017-27019
or
nc -zv localhost 27017
</code></pre>

You can also use telnet command

<pre><code>telnet &lt;ip/host&gt; port
</code></pre>

blocks|key|1497430|text|在Bash中，您可以使用伪设备文件，这些文件可以打开到相关套接字的TCP连接。语法为/dev/$tcp_udp/$host_ip/$port。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1497431|下面是测试Memcached是否正在运行的简单示例：|1497432|</dev/tcp/localhost/11211+&&+echo+Port+open+%7C%7C+echo+Port+closed|code-block|syntax|javascript|1497433|下面是另一个测试，看看特定的网站是否可以访问：|1497434|$+echo+"HEAD+/+HTTP/1.0"+>+/dev/tcp/example.com/80+&&+echo+Connection+successful.
Connection+successful.|1497435|有关更多信息，请查看：Advanced+Bash-Scripting+Guide:+Chapter+29.+/dev+and+/proc。|1497436|相关:+SuperUser上的Test+if+a+port+on+a+remote+system+is+reachable+(without+telnet)。|1497437|更多示例请参见：How+to+open+a+TCP/UDP+socket+in+a+bash+shell+(文章)。|1497438|entityMap|0|LINK|mutability|MUTABLE|url|http://www.tldp.org/LDP/abs/html/devref1.html|1|https://superuser.com/q/621870/87805|2|http://xmodulo.com/tcp-udp-socket-bash-shell.html^0|16|S|0|0|0|0|0|1I|4|1R|5|B|1L|0|0|F|1R|1|0|8|18|2|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1D|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1E|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|S|3|T|5|6|7|1N|8|@]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|U|3|V|5|6|7|1R|8|@]|D|@$9|1S|A|1T|1|1U]]|E|$]]|$1|W|3|-4|5|6|7|1V|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13]]|14|$5|Z|10|11|E|$12|15]]|16|$5|Z|10|11|E|$12|17]]]]

In Bash, you can use pseudo-device files which can open a TCP connection to the associated socket. The syntax is <code>/dev/$tcp_udp/$host_ip/$port</code>.

Here is simple example to test whether Memcached is running:

<pre><code>&lt;/dev/tcp/localhost/11211 &amp;&amp; echo Port open || echo Port closed
</code></pre>

Here is another test to see if specific website is accessible:

<pre><code>$ echo "HEAD / HTTP/1.0" &gt; /dev/tcp/example.com/80 &amp;&amp; echo Connection successful.
Connection successful.
</code></pre>

For more info, check: <a href="http://www.tldp.org/LDP/abs/html/devref1.html" rel="nofollow noreferrer">Advanced Bash-Scripting Guide: Chapter 29. <code>/dev</code> and <code>/proc</code></a>.

Related: <a href="https://superuser.com/q/621870/87805">Test if a port on a remote system is reachable (without telnet)</a> at SuperUser.

For more examples, see: <a href="http://xmodulo.com/tcp-udp-socket-bash-shell.html" rel="nofollow noreferrer">How to open a TCP/UDP socket in a bash shell</a> (article).

I need a command line that can check the port status on a remote host. I tried <code>ping xxx.xxx.xxx.xxx:161</code> but it doesn't recognize the "host". I thought it was a "good" answer until I did the same command against a host I know has that port open. This is for a batch file on Windows that will check the status of the remote port then run a command that uses that remote port for information, then the remote port check command again, then the command that uses that port on the next server for information, and so on. I've looked everywhere and thought the ping might do it, but there must be various versions of ping, I suppose as the server I am doing this on does not show that option.

Just for chuckles, I tried a web-based remote port checker from a website - and the results were correct for both the "problem" server and the correct server. However, I can't use that in a batch run with 500+ server IPs in it. 

Is there something I can do that is simple? My Perl skills are extremely rusty (use it or lose it), don't know any other Windows based languages except batch. Unix is my skill, but this must be executed from Widows Server 2003.

Check status of one port on remote host

服务器

Windows

Linux

Unix

Perl

我需要一个命令行来检查远程主机上的端口状态。我尝试过ping xxx.xxx.xxx.xxx:161，但它无法识别“主机”。我认为这是一个“好”的答案，直到我对一台我知道已打开该端口的主机执行了相同的命令。这适用于Windows上的批处理文件，该批处理文件将检查远程端口的状态，然后运行使用该远程端口获取信息的命令，然后...

问检查远程主机上一个端口的状态
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