How to Connect a Domain to Your Server Using DNS A Records

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Linking a domain to a server requires creating DNS A records (for IPv4) and AAAA records (for IPv6) that point to the server's public IP address. This process is essential not just for branding but also for enabling TLS certificates via services like Let's Encrypt, which require a publicly resolving domain. Key concepts include TTL (Time To Live), which controls how long resolvers cache a DNS answer, and propagation, the gradual process by which updated records spread across global DNS caches. Administrators can verify correct configuration using the dig command-line tool after allowing a few minutes for changes to take effect. Optionally, setting up reverse DNS (PTR records) is recommended for servers that send email.

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