1. netstat命令简介

Netstat 命令用于显示各种网络相关信息，如网络连接，路由表，接口状态 (Interface Statistics)，masquerade 连接，多播成员 (Multicast Memberships) 等等。

电脑怎么看端口（移动宽带端口查询）(1)

netstat命令简介

电脑怎么看端口（移动宽带端口查询）(2)

2. 查看netstat 所有状态

[root@zcwyou ~]# netstat -a

  

	Active Internet connections (servers and established)

  

	Proto Recv-Q Send-Q Local Address Foreign Address State

  

	tcp 0 0 my_public_ip:9016 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9017 0.0.0.0:* LISTEN

  

	tcp 0 0 localhost:smtp 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9018 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:pptp 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9019 0.0.0.0:* LISTEN

  

	3. 查看所有TCP连接
[root@zcwyou ~]# netstat -at

  

	Active Internet connections (servers and established)

  

	Proto Recv-Q Send-Q Local Address Foreign Address State

  

	tcp 0 0 my_public_ip:9016 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9017 0.0.0.0:* LISTEN

  

	tcp 0 0 localhost:smtp 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9018 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:pptp 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9019 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:tambora 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public:etlservicemgr 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:dynamid 0.0.0.0:* LISTEN

  

	tcp 0 0 my_public_ip:9003 0.0.0.0:* LISTEN

  

	4. 禁用反向域名解析，加快查询速度
[root@zcwyou ~]# netstat -ant

  

	tcp 0 0 113.105.164.151:42342 202.46.36.30:9001 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:49472 202.46.36.30:9001 ESTABLISHED

  

	tcp 0 0 113.105.164.151:43470 202.46.36.30:9001 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:43576 202.46.36.30:9001 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:9001 120.84.140.61:6290 FIN_WAIT2

  

	tcp 0 0 113.105.164.151:9015 183.14.29.69:6809 FIN_WAIT2

  

	tcp 0 0 113.105.164.151:35424 202.46.36.30:9002 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:38074 202.46.36.30:9001 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:9001 118.112.75.246:2710 FIN_WAIT2

  

	tcp 0 0 113.105.164.151:45124 202.46.36.30:9001 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:37202 202.46.36.30:9001 CLOSE_WAIT

  

	tcp 0 0 113.105.164.151:52640 202.46.36.30:9001 CLOSE_WAIT

  

	5. 持续刷新信息

  

	我们可以使用 netstat 的 -c 选项持续输出信息。
[root@zcwyou ~]# netstat -ct

  

	6. 常见用法

  

	6.1 查看所有TCP监听端口
[root@zcwyou ~]# netstat -lntp
电脑怎么看端口（移动宽带端口查询）(3)
  

	linux查看所有TCP监听端口

  

	6.2 查看所有的TCP连接情况
[root@zcwyou ~]# netstat -antp

  

	6.3 查看所有UDP连接情况
[root@zcwyou ~]# netstat -anp |sed -n '2p;/^udp/p'

  

	6.4 查看所有已经建立的TCP连接
[root@zcwyou ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p'
电脑怎么看端口（移动宽带端口查询）(4)
  

	linux查看所有已经建立的TCP连接

  

	6.5 查看系统当前TCP连接数:
[root@zcwyou ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p' |wc -l

  

	6.6 查看TCP半开连接,正常情况下,应该看不到有数据
[root@zcwyou ~]# netstat -nap | grep SYN_RECV

  

	6.7 查看TCP半开连接数,正常情况下应该为0
[root@zcwyou ~]# netstat -nap | grep SYN_RECV |wc -l

  

	6.8 查看网络统计信息
[root@zcwyou ~]# netstat -s