Resource
DNS Lookup Guide
A practical guide to DNS lookups, A records, AAAA records, and checking whether a domain resolves to the expected IP address.
A DNS lookup converts a domain name into the technical records browsers and apps need to reach a website, mail server, or service.
When to run a DNS lookup
Run a lookup when a website has moved hosts, a domain is not loading, a CDN configuration changed, or you need to confirm that a domain points to the expected server.