先来说下什么是端口呢~
一、端口概念
在网络技术中，端口（Port）大致有两种意思：
一是物理意义上的端口，比如，ADSL Modem、集线器、交换机、路由器用于连接其他网络设备的接口，如RJ-45端口、SC端口等等。
二是逻辑意义上的端口，一般是指TCP/IP协议中的端口，端口号的范围从0到65535，比如用于浏览网页服务的80端口，用于FTP服务的21端口等等。
二、网络端口的分类
按端口号可分为3大类：
（1）公认端口（Well-KnownPorts）：范围从0到1023
（2）动态端口（Dynamic Ports）：范围从1024到65535
(2.1)注册端口（RegisteredPorts）：从1024到49151
(2.2)动态和/或私有端口（Dynamicand/orPrivatePorts）：从49152到65535。
下面是几个日常我们会有经常用到的一些常见端口：
端口：21
服务：FTP
说明：FTP服务器所开放的端口，用于上传、下载。最常见的攻击者用于寻找打开anonymous的FTP服务器的方法。这些服务器带有可读写的目录。木马Doly Trojan、Fore、Invisible FTP、WebEx、WinCrash和Blade Runner所开放的端口。
端口：22
服务：Ssh
说明：PcAnywhere建立的TCP和这一端口的连接可能是为了寻找ssh。这一服务有许多弱点，如果配置成特定的模式，许多使用RSAREF库的版本就会有不少的漏洞存在。
端口：25
服务：SMTP
说明：SMTP服务器所开放的端口，用于发送邮件。入侵者寻找SMTP服务器是为了传递他们的SPAM。入侵者的帐户被关闭，他们需要连接到高带宽的E-MAIL服务器上，将简单的信息传递到不同的地址。木马Antigen、Email Password Sender、Haebu Coceda、Shtrilitz Stealth、WinPC、WinSpy都开放这个端口。
端口：80
服务：HTTP
说明：用于网页浏览。木马Executor开放此端口。
端口：88
说明：Kerberos krb5。另外TCP的88端口也是这个用途。
端口：443
服务：Https
说明：网页浏览端口，能提供加密和通过安全端口传输的另一种HTTP。
端口：3389
服务：超级终端
说明：WINDOWS 2000终端开放此端口。
端口：8080
服务：代理端口
说明：WWW代理开放此端口。
如果经常接触网络工程， 那么这些常用协议和端口号请记住了，对我们日常使用有个了解。
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