Precision-engineered user agent parser for the modern web.
About User agent parser
User agent parser is a professional-grade networking diagnostic that runs locally in your browser and gives you an instant, accurate read on a URL's transport-layer health. Paste a domain and it returns the TLS certificate chain, security headers, redirect path, DNS resolution and every infrastructure detail that affects trust, uptime and SEO. Because it runs on-device, you can audit staging environments, internal services and client sites without exposing hostnames to an external service. The result is a fast, private alternative to whois/dig/curl chains and bloated paid monitoring tools.
Problems This Tool Solves
Chaining dig, openssl and curl to diagnose a domain is slow and not friendly to non-engineers. - User agent parser gives you the same information in a single paste-and-analyse flow, readable by engineers and stakeholders alike.
Expired, misconfigured or weak TLS certificates silently break user trust. - User agent parser validates the full certificate chain, flags near-expiry, and warns about deprecated ciphers and weak keys.
Missing security headers quietly open a site to XSS, clickjacking and MITM attacks. - User agent parser scores the header set against the current OWASP baseline and gives copy-paste fixes.
Pasting data into an online tool means trusting a third-party server with your content. - User agent parser runs 100% inside your browser — nothing you paste is transmitted, logged, or stored.
How to Use
Enter the target host - Works with domains, subdomains and full URLs — HTTPS or HTTP.
Run the probe - DNS, TLS, headers and redirects are checked in parallel for a sub-second report.
Review the dashboard - Issues are grouped by severity with plain-language descriptions.
Export or share - Download the audit as PDF/JSON or copy a direct link to share with your team.
Why This Tool Is Better
One-click, zero setup - No installing openssl, no configuring a DNS resolver, no hunting for the right flag — just paste and go.
Private by architecture - Every probe runs client-side, so sensitive and internal hostnames stay on your device.
Built on current 2026 baselines - Cipher strength, TLS versions and header recommendations track live OWASP and Mozilla Observatory guidance.
Category: Advanced / Power Tools
This tool runs entirely in your browser. No data is sent to any server. Try the User agent parser now - it is free.