DNS, WHOIS & Lookup Utilities
Plain-English guides to DNS, WHOIS, SSL, email security, and the infrastructure behind every domain.
Learn what nameservers are, how they work, and why they are responsible for directing DNS traffic for your domain.
Learn how DNS propagation works, why DNS changes take time to update across the internet, and how DNS caching and TTL affect propagation speed.
Learn what DNSSEC is, how it protects DNS records from tampering, and why DNS Security Extensions improve domain trust and security.
Learn what DKIM is, how DomainKeys Identified Mail works, why DKIM records matter for email deliverability, and how DKIM helps prevent email spoofing.
Learn what DMARC is, how it works with SPF and DKIM, and how DMARC policies help protect domains from email spoofing and phishing attacks.
Learn the most common reasons emails go to spam, including SPF, DKIM, DMARC, domain reputation, reverse DNS, and email content issues.