shell:$ nslookup -timeout=2 -retry=1 'developers.doku.com'
Server: 1.1.1.1
Address: 1.1.1.1#53
Non-authoritative answer:
developers.doku.com canonical name = 3b3541b7e7-hosting.gitbook.io.
Name: 3b3541b7e7-hosting.gitbook.io
Address: 104.18.40.47
Name: 3b3541b7e7-hosting.gitbook.io
Address: 172.64.147.209
Name: 3b3541b7e7-hosting.gitbook.io
Address: 2606:4700:4407::6812:282f
Name: 3b3541b7e7-hosting.gitbook.io
Address: 2606:4700:4402::ac40:93d1
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