How do I telnet/check UDP ports whether it is open or not?

How do I telnet/check UDP ports whether it is open or not?

Use nmap as below, port UDP 123 is the common ntp daemon port.

$ nmap -p 123 -sU -P0 192.168.0.0
$ nc -zu 192.168.0.0 123


You may to look for “nc”, “iperf” tools as well.

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