shell:$ nslookup -timeout=2 -retry=1 'challenges.cloudflare.com'
Server: 1.1.1.1
Address: 1.1.1.1#53
Non-authoritative answer:
Name: challenges.cloudflare.com
Address: 104.18.95.41
Name: challenges.cloudflare.com
Address: 104.18.94.41
Name: challenges.cloudflare.com
Address: 2606:4700::6812:5e29
Name: challenges.cloudflare.com
Address: 2606:4700::6812:5f29
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