Obviously, the homepage: https://news.ycombinator.com/
HN’s official status page: https://mobile.twitter.com/hnstatus
This URL checks if the API is up: https://hacker-news.firebaseio.com/v0/item/1.json?print=pret...
HN Search Engine: https://hn.algolia.com
AWS Route 53 status, it is the service that manages HN’s DNS: https://cloudharmony.com/status-of-dns-for-aws
YC DNS record: https://whois.gandi.net/en/results?search=ycombinator.com
HN’s official email: hn@ycombinator.com
Note: Intentionally left off YC, since it appears to be unrelated beyond the DNS.
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Forgot something, let me know. Thanks!