nmap

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nmap -p- 192.168.31.42

查看192.168.31.42有多少端口是打开的

nmap -p 3306 192.168.31.0/24

查看在192.168.31.？网段中哪些电脑的3306端口是打开的

nmap 154.29.149.116 -sV -T4 -O -p 20,3000

https://blog.csdn.net/weixin_46065653/article/details/126629475

https://blog.csdn.net/m0_64910183/article/details/126613206

https://blog.csdn.net/weixin_45597678/article/details/118583047

https://blog.csdn.net/zwm_20211031_475/article/details/127578632