web dev//DNS

Domain Name System -- the internet's phonebook. Translates human-readable domain names (`3clabs.io`) into IP addresses (`104.18.x.x`).

Domain Name System -- the internet's phonebook. Translates human-readable domain names (3clabs.io) into IP addresses (104.18.x.x).

Distributed, hierarchical system: root servers **> TLD servers (.io, .com) **> authoritative servers (your provider)

Key record types: A (domain **> IPv4), AAAA (domain **> IPv6), CNAME (alias --> another domain), MX (mail), TXT (verification, SPF)

Propagation (TTL): changes take minutes to 48 hours to spread globally

Cloudflare is one of the largest DNS providers