shell:$ nslookup -timeout=2 -retry=1 'mx-ll-171.6.16-195.dynamic.3bb.co.th' Server: 127.0.0.53 Address: 127.0.0.53#53 Non-authoritative answer: Name: mx-ll-171.6.16-195.dynamic.3bb.co.th Address: 171.6.16.195