DNS Operations

Troubleshooting DNS errors, diagnostic tools (dig, nslookup), performance tuning, provider strategy, and operational how-tos.

When DNS breaks, you need to diagnose and fix it fast. These articles cover troubleshooting tools (dig, nslookup), common errors, performance tuning, provider selection, and the operational practices that keep DNS running smoothly.

DNS Troubleshooting: How to Fix Common DNS Problems

Systematic guide to troubleshooting DNS problems. Covers site not loading, email failures, propagation delays, NXDOMAIN, SERVFAIL, and wrong IP resolution.

Common DNS Errors and What They Mean

A complete reference guide for DNS error codes and common problems including NXDOMAIN, SERVFAIL, REFUSED, and browser-level DNS errors with causes and fixes.

How to Fix Slow DNS Lookups

Diagnose and fix slow DNS lookups. Covers common causes like ISP resolvers, high TTLs, and provider issues, plus step-by-step fixes using dig, nslookup, and browser DevTools.

How to Flush DNS Cache on Every Platform

Step-by-step instructions to flush DNS cache on Windows, macOS, Linux, Chrome, Firefox, Safari, and routers. Learn when and why to clear your DNS cache.

How to Change Nameservers Without Breaking Your Site

Step-by-step guide to safely changing nameservers. Covers pre-migration checklist, TTL management, record verification, monitoring, and rollback strategy.

Why You Should Use Multiple DNS Providers

Learn why DNS redundancy matters and how to implement a multi-provider DNS strategy with primary/secondary or active/active configurations for maximum uptime.

Public DNS Providers Compared: Google, Cloudflare, Quad9, and More

Compare the best public DNS providers including Google, Cloudflare, Quad9, OpenDNS, and NextDNS. Covers speed, privacy, security features, and IP addresses.