Try the following:
$ nslookup github.com
[...]
Non-authoritative answer:
Name: github.com
Address: 140.82.121.3
See also the completely ignored post in their forums.
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Does gitlab.com have it?
Name: gitlab.com Address: 172.65.251.78 Name: gitlab.com Address: 2606:4700:90:0:f22e:fbec:5bed:a9b9