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echo quit | timeout 3 telnet 8.8.8.8 53

Above The above command will try for three seconds to connect to a commonly knonw name known named server hosted by google (port 53 is the default port for DNS services).

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TIP: If google services are not available in your organizationorganisation, please pick a suitable alternative IP address port pair. In the UK echo quit | timeout 3 telnet 1.1.1.1 53 is probably a good pick IF you are not limited to N3/HSNC. 1.1.1.1 is cloudflare managed domain server.

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