http://lpiyu33y57lg2ulcihkemzb56inqm4g6jlk7hlgenbqedl4abcfq5aid.onion/workshops/What's-in-a-Name-Understanding-the-Domain-Name-System
Beyond the popular understanding as a name-to-address lookup system, the DNS is actually a massive, distributed, delegated database that allows organizations to publish all kinds of useful information in the form of resource records (RRs) . For instance, today DNS is also used to fight email spam and phishing attacks (using DNS-backed protocols like SPF , DKIM , DMARC , and DANE , and CAA resource records), perform service discovery (with SRV records ), and more.