DNS Records Demystified: How A, MX, TXT and Other Types Power the Internet

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DNS records are the actual data returned during domain name resolution, determining where websites are hosted, where emails are delivered, and how services are authenticated. Seven core record types — A, AAAA, CNAME, MX, TXT, NS, and SRV — underpin the vast majority of modern websites, applications, and cloud infrastructure. Misconfigured DNS records are a leading cause of internet outages, capable of taking websites offline, blocking emails, and breaking SSL certificate issuance. An A record, the most basic type, maps a hostname to an IPv4 address and is essential for directing browser traffic to the correct server. Understanding these record types is considered critical for anyone involved in launching, migrating, or troubleshooting internet-facing systems.

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