NetCheck MCP Server
9 MCP tools for network diagnostics. DNS lookup, SSL validation, HTTP checks, email authentication, IP info, and WHOIS - all from AI conversation.
Overview
A network diagnostics toolkit for AI agents. Check DNS records, validate SSL certificates, test HTTP endpoints, verify email authentication, and look up domain information - all through natural conversation.
Features
Lookup, reverse, propagation
Availability & redirects
Certificate validation
Headers analysis
SPF, DKIM, DMARC
IP info, WHOIS
Tool Reference
dns_lookupQuery DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, SRV)dns_reverseReverse DNS lookup for IPv4 and IPv6 addressesdns_propagationCheck DNS propagation across 3 global resolversTechnical Architecture
Data Sources
DNS Resolution
Three global resolvers for propagation checks:
- Cloudflare DoH (1.1.1.1)
- Google DoH (8.8.8.8)
- NextDNS
SSL Validation
Certificate Transparency logs via crt.sh for comprehensive certificate history.
WHOIS Data
RDAP protocol for modern, structured domain registration data. Supports 30+ TLDs (excludes .au which doesn’t support RDAP).
IP Intelligence
ip-api.com for geolocation, ASN, ISP, and hosting/proxy detection.
Example Workflow
Check if example.com has valid DNS and SSL
DNS: Resolving to 93.184.216.34, MX records pointing to mail.example.com
SSL: Valid certificate issued by DigiCert, expires in 245 days
How are their security headers?
Grade: B+
- ✅ HSTS enabled
- ✅ X-Frame-Options set
- ⚠️ Missing Content-Security-Policy
- ⚠️ Missing Permissions-Policy
Use Cases
Domain Troubleshooting - Diagnose DNS and connectivity issues
Security Audits - Check SSL certificates and security headers
Email Deliverability - Verify SPF, DKIM, and DMARC configuration
Due Diligence - Research domain registration and hosting
Monitoring - Check website availability and redirect chains
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