探测服务器开放监听的端口

1 探测服务器开放监听的端口

工作找那个有时候需要知道正在使用的服务器开放了哪些端口，或者监听了哪些端口，直接找运维毕竟有点麻烦，简单的办法就是自己查询公网ip，并利用嗅探工具查询一下，简单总结如下，方便以后使用。

#### 1 获取主机端口-如下几条命令，任选其一
curl cip.cc
curl ifconfig.me
curl http://members.3322.org/dyndns/getip
wget http://ifconfig.me/ip
curl http://members.3322.org/dyndns/getip
#### 2 使用nmap进行探测
nmap 123.57.109.11

#详情打印如下所示
Starting Nmap 7.80 ( https://nmap.org ) at 2020-07-15 16:56 CST
Nmap scan report for 123.57.209.159
Host is up (0.030s latency).
Not shown: 974 filtered ports
PORT      STATE  SERVICE
80/tcp    open   http
443/tcp   open   https
1720/tcp  closed h323q931
1935/tcp  closed rtmp
3389/tcp  closed ms-wbt-server
6002/tcp  closed X11:2
7000/tcp  closed afs3-fileserver
8081/tcp  closed blackice-icecap