https://blog.csdn.net/z1134145881/article/details/54706711
1.telnet
用法: telnet ip port (1) telnet连接不存在的端口 telnet 1.1.1.1 8 Trying 1.1.1.1... telnet: connect to address 1.1.1.1: Connection timed out (2) telnet 链接存在端口 telnet 1.1.1.1 8000 Trying 1.1.1.1... Connected to 1.1.1.1. Escape character is ‘^]‘. Connection closed by foreign host.
2.wget
用法: wget ip:port (1) 不存在端口 wget 1.1.1.1:8 --2017-01-24 11:38:34-- http://1.1.1.1:8/ Connecting to 1.1.1.1:8... failed: Connection timed out. Retrying. (2) 存在端口 wget 1.1.1.1:8000 --2017-01-24 11:39:03-- http://1.1.1.1:8000/ Connecting to 1.1.1.1:8000... connected. HTTP request sent, awaiting response... 200 OK
3.ssh
用法: ssh -v -p port username@ip -v 调试模式(会打印日志). -p 指定端口
4.
用法: curl ip:port (1) 不存在端口 获取不到结果 (2) 存在端口 curl 1.1.1.1:8000 <!DOCTYPE html> <html> <head>xxx</head> <body> ...... </body> </html>
原文：https://www.cnblogs.com/whutao/p/11721944.html