Site diagnostics
Free website diagnostic tool is live: SSL, DNS, security, and availability in one scan
After months of development, I'm excited to share a free website diagnostic tool that checks SSL, DNS, security headers, availability, and more in one scan.
Written by Anton Melekhin on January 10, 2026
It came from years of supporting websites and spending too much time jumping between separate tools just to understand why a site was down. I wanted one button that runs all key checks and shows what's wrong.
Now it's live. If you work with websites, I'd really appreciate it if you gave it a try and shared feedback.
What the website checker analyzes
The tool helps determine whether a website issue is global or local and gives a structured reliability snapshot in seconds.
- Domain status and WHOIS-related visibility
- DNS records: A, AAAA, CNAME, MX, TXT, NS
- Resolved website IP and network context
- Ping availability from multiple locations
- Hosting provider lookup
- Public URL accessibility check
- SSL certificate expiration, issuer, and validity details
Stop guessing and start diagnosing. This release is the first major milestone of a larger monitoring project at sitecenter.app.