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Network & Browser Toolbox

Public DNS lookups, subnet calculations and browser inspection.

How to use this tool
  1. Choose the inspection, conversion or security operation.
  2. Supply the expected input and review its limits.
  3. Run the operation and review the result.

Limits and requirements

Do not treat diagnostic results as a comprehensive security audit.

Check each operation’s notes. Some workflows run on your device; others use the OneTabTool server or a named third-party service. Don’t assume every tool processes files in the same way.

Available operations

  • Website favicon checker
  • TLS certificate / HTTP headers inspector

    Checks a fresh HTTPS connection with normal certificate validation. Does not audit all TLS configurations.

  • Redirect chain checker

    HEAD requests; follows up to five public hops. Some sites handle HEAD differently from normal page requests.

  • IPv4 subnet / CIDR calculator
  • IPv4 ↔ integer / binary
  • DNS record lookup
  • Email domain MX lookup

    An MX record does not prove an individual mailbox exists.

  • Public IP & browser details

    Requests your current public IP from ipify; VPN/proxy changes the result.

  • User agent inspector

    Best-effort string parsing. User-agent strings can be spoofed.

  • MIME type reference

Questions about Network & Browser Toolbox

What does Network & Browser Toolbox do?

Public DNS lookups, subnet calculations and browser inspection.

How do I use Network & Browser Toolbox?

Choose the inspection, conversion or security operation. Supply the expected input and review its limits. Run the operation and review the result.

What should I check before using the result?

Do not treat diagnostic results as a comprehensive security audit.

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