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Internet & Wi-Fi / Free troubleshooting tool

DNS Troubleshooting Guide

Troubleshoot DNS resolution and sites that will not load.

DNS Troubleshooting Guide

Troubleshoot DNS resolution and sites that will not load.

DNS failures can prevent websites loading even if your internet works.
  1. Check whether the issue affects one site: Try a second well-known website and a second device.
  2. Inspect DNS on Windows: Open Command Prompt and run: nslookup example.com
  3. Flush cached DNS safely: Open Command Prompt and run: ipconfig /flushdns
  4. If all devices fail: Check router DNS settings or contact your internet provider.

How to use this tool

Follow the steps above. Browser tests run locally when possible; other tasks provide practical troubleshooting guidance rather than claiming to scan your computer or network.

Important limitations

Results depend on your device, permissions, Windows version and network configuration. Back up important files before system changes and consult your device manufacturer for hardware repairs.