DNS lookup
Look up the A, MX, TXT and NS records of a domain in an instant.
Server request
DNS lookup
A and AAAA records point at the web server address, MX at the mail servers, TXT usually carries SPF and DMARC anti-spam policies, and NS names the authoritative servers for the domain. The TTL says how many seconds a resolver may cache the answer — which is why a DNS change takes time to propagate.