What do domain status codes mean?

What do those funny "domain status" codes in the Whois mean? Here's a quick reference chart to determine what's going on and whether to take action.

HTTP request activity returns status code 0 and empty response, but works in SoapUI - Help - UiPath Community Forum

Domain resolving with NXDOMAIN or incorrect IP address – OpenDNS

EPP Status Codes: What do they mean, and why should I know? - PDF Free Download

502 Bad Gateway Error [Solved]

INFOGRAPHIC] Status Codes Explained • blog

What is 403 Status Code 📖 How to Identify and Fix?

Appendix B - Helpful Howto for EPP registrars

What does the error Webhook url should contain same domain as account webhook url mean : Apexx Global

305 HTTP Response Status Code Definition: Example, Usage, Methods - Holistic SEO