Check DNS, HTTPS, and HTTP headers from your browser

Updated 11 September 2026

When a site “works on my phone but not on the laptop,” the cause is often DNS, redirects, or certificate mismatch. Network Tools gives you browser-accessible checks without installing a separate toolkit for every diagnosis.

Useful first checks

• DNS records for the hostname you expect
• HTTP status and redirect chains
• TLS certificate dates and hostnames
• Response headers such as HSTS or CSP when debugging security setup

Beginner workflow

1. Write down the exact URL that fails, including http vs https.
2. Open Network Tools.
3. Run DNS and HTTPS checks on the hostname.
4. Compare the redirect chain with the URL you typed.

These tools help you observe. They are not a substitute for authorized security testing on systems you do not own.