Domain diagnostics, from browser to agent
NerdTools is a domain diagnostic platform for developers, system administrators, security professionals and products that need reliable infrastructure signals.
Use the public scanner for one-off investigations, the REST API for production integrations, or the MCP server to give compatible AI agents structured DNS and email-security tools.
Available Tools
WHOIS Lookup
DNS Lookup
SSL Check
Security Headers
Blacklist Check
SPF Check
MX Check
DMARC Check
Ping
Port Scan
IP Info
IP Reputation
SEO Analysis
Robots.txt Checker
Sitemap Checker
Why NerdTools?
- No registration required for browser scans
- Run multiple checks simultaneously with a single query
- Authenticated REST and MCP access for repeatable workflows
- Free developer access with paid production capacity
Privacy First
We respect your privacy. Scans are processed in real-time and we don't store or share the results of your queries with third parties. See our Privacy Policy for details.
More Information
Read our Terms of Service or get in touch if you have questions.