DNS & nameservers
How the Domain Name System finds your website and mail servers: record types, TTLs and caching, nameservers and DNSSEC, explained step by step.
3 guides
How DNS Works: Resolvers, Caching and Propagation
A clear walkthrough of how a domain name becomes an IP address, the difference between recursive and authoritative servers, how caching and TTL work, and what DNS propagation really means.
Understanding DNS Records: A, MX, TXT, CAA and More
A practical guide to the DNS record types you are most likely to meet, including A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV and PTR, with examples and the rules that trip people up.
Understanding Nameservers: Delegation, Glue and Changes
Nameservers are the authoritative servers that publish a domain's DNS records. Learn how delegation and glue work, why you need at least two diverse nameservers, how to change them safely and what lame delegation means.