下载windows版nmap ，下载后双机默认安装。
Download the Free Nmap Security Scanner for Linux/Mac/Windows
打开CMD ， 输入 cd C:\Program Files (x86)\Nmap
C:\Program Files (x86)\Nmap>ncat -z -v -u ntp.aliyun 123
Ncat: Version 7.80 ( https://nmap/ncat )
Ncat: Connected to 203.107.6.88:123.
Ncat: UDP packet sent successfully #这里是成功的提示
Ncat: 1 bytes sent, 0 bytes received in 2.11 seconds.
C:\Program Files (x86)\Nmap>ncat -z -v -u localhost 162
Ncat: Version 7.80 ( https://nmap/ncat )
Ncat: Connected to ::1:162.
Ncat: 远程主机强迫关闭了一个现有的连接。 . #这里是失败的提示
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