移動寬帶端口查詢：電腦怎麼看端口

1. netstat命令簡介

Netstat 命令用於顯示各種網絡相關信息，如網絡連接，路由表，接口狀態 (Interface Statistics)，masquerade 連接，多播成員 (Multicast Memberships) 等等。

netstat命令簡介

2. 查看netstat 所有狀態

[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連接

[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，加快查詢速度

[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. 持續刷新信息

我們可以使用 netstat 的 -c 選項持續輸出信息。

[root@zcwyou ~]# netstat -ct

6. 常見用法

6.1 查看所有TCP監聽端口

[root@zcwyou ~]# netstat -lntp

linux查看所有TCP監聽端口

6.2 查看所有的TCP連接情況

[root@zcwyou ~]# netstat -antp

6.3 查看所有UDP連接情況

[root@zcwyou ~]# netstat -anp |sed -n '2p;/^udp/p'

6.4 查看所有已經建立的TCP連接

[root@zcwyou ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p'

linux查看所有已經建立的TCP連接

6.5 查看系統當前TCP連接數:

[root@zcwyou ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p' |wc -l

6.6 查看TCP半開連接,正常情況下,應該看不到有數據

[root@zcwyou ~]# netstat -nap | grep SYN_RECV

6.7 查看TCP半開連接數,正常情況下應該為0

[root@zcwyou ~]# netstat -nap | grep SYN_RECV |wc -l

6.8 查看網絡統計信息

[root@zcwyou ~]# netstat -s