DNS
DNS (the Domain Name System) is the internet's directory service, translating human-readable domain names like adminkit.net into the numeric IP addresses computers actually use to route traffic. A DNS lookup walks a hierarchy of servers -- root, top-level-domain, and authoritative nameservers for the specific domain -- to resolve a name to its records, which can include an A/AAAA record (the IP address), an MX record (mail server), a TXT record (often used for SPF/DMARC or domain verification), and more. Every authentication mechanism email relies on, and most of the web's addressing, sits on top of DNS working correctly and resolving quickly.
By AdminKit team, Netbase JSC · Updated