DNS
MX Priority in Real Life: How Mail Chooses a Server When Things Break
Discover how mail servers use MX priority for failover, why backup MX can be complex, and the critical misconfigurations to avoid—ensuring reliable email delivery.
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DNS
Nameserver Change vs Record Change: Which Fixes Your Issue Faster?
Should you update DNS records or change nameservers? Learn the key differences—speed, control, and email risk—to make the right choice and avoid common domain management pitfalls.
DNS
DNS 101: The Four Records You'll Actually Use
Master the four essential DNS records—A, CNAME, MX, TXT—for everyday domain management, website setup, and email routing. Avoid common configuration pitfalls.
DNS
Subdomain Drift: The Quiet Misconfiguration That Opens Paths for Takeover Attacks
Discover how subdomain drift exposes organisations to takeover attacks. Learn why misaligned DNS records create silent, high-risk vulnerabilities.
DNS
Outbound vs Inbound Mail DNS: Different Records, Different Risks
Master email DNS: Outbound records ensure authentication (SPF, DKIM, DMARC)—Inbound records manage routing and security (MX, MTA-STS, TLS-RPT). Prevent misconfiguration.
DNS
SERVFAIL vs NXDOMAIN: Reading Resolver Errors and Fixing Them Fast
Quickly diagnose and fix DNS resolution failures. Understand the difference between SERVFAIL and NXDOMAIN—use our systematic runbook for effective troubleshooting.
DNS
Negative Caching (NXDOMAIN) 101: Using NSEC & TTLs to Your Advantage
Optimize DNS performance and security by understanding negative caching (NXDOMAIN) and TTLs—learn about NSEC, NSEC3, and practical configuration.
DNS
When DNS Providers Throttle You: Rate Limits, Overuse, and Hidden Performance Penalties
DNS providers use rate limits to manage overload. Learn how throttling works, why it affects performance, and how to reduce hidden DNS penalties.
DNS
The DNS Fingerprint Effect: How Resolvers Shape Your Domain’s Reputation Signals
Learn how DNS resolver behaviour influences your domain’s reputation through stability signals, timing patterns, and global DNS fingerprints.
DNS
Why Redirect Hops Become DNS Multipliers: Understanding Multi-Step Resolution Costs
Redirect chains trigger extra DNS queries that slow your site. Learn how multi-step resolution works and how to reduce DNS lookup inflation.
DNS
DNS Lookup Inflation: How Third-Party Scripts Quietly Consume Your Speed Budget
Third-party scripts silently trigger extra DNS lookups that slow your site. Learn how lookup inflation works and how to reduce its impact.
DNS
Resolver Roulette: Why Different Mobile ISPs Return Different DNS Answers
Mobile networks often return different DNS answers due to routing, caching, and resolver inconsistencies. Learn why resolver roulette occurs and how to fix its impact.