Networking & DNS tutorials

Networking and DNS explained simply: record types, subdomains, propagation, reverse DNS, Cloudflare, CDN, IPv6, private networks and email records.

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Networking & DNS

What is DNS propagation and how to check it

After you change a DNS record, it takes time to update everywhere. Here is why, and how to check the status.

Updated 10/23/2026 Networking & DNS

What is reverse DNS (PTR) and why it matters

Reverse DNS links an IP back to a name and is essential for email delivery. Here is how it works.

Updated 10/23/2026