Domain Relationship Graph API

Map relationships between domains through shared infrastructure. Discover connected domains via common nameservers, mail servers, IP addresses, registrants, analytics IDs, and SSL certificates.

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Try it now - no signup required:
curl "https://domscan.net/v1/graph?domain=example.com"

Example Response

{
  "domain": "example.com",
  "connections": {
    "by_nameserver": ["example.net", "example.org"],
    "by_mx": ["example-mail.com"],
    "by_ip": ["example-cdn.com"],
    "by_registrant": ["example-corp.com"],
    "by_analytics": ["example-blog.com"],
    "by_ssl_issuer": ["example-secure.com"]
  },
  "connection_count": 6,
  "infrastructure": {
    "nameservers": ["ns1.example.com", "ns2.example.com"],
    "mx_servers": ["mail.example.com"],
    "ip_addresses": ["93.184.216.34"]
  },
  "confidence_scores": {
    "same_owner": 0.95,
    "related_business": 0.78
  }
}

Key Features

Infrastructure Mapping

Discover domains sharing NS, MX, or IP.

Registrant Connections

Find domains with same registration details.

Analytics Tracking

Connect domains via shared tracking codes.

SSL Certificate Links

Find domains on same SSL certificates.

Ownership Confidence

AI-powered same-owner probability scoring.

Business Relationships

Detect likely business affiliations.

Hidden Asset Discovery

Uncover undisclosed domain portfolios.

Fraud Investigation

Trace connected domains in fraud networks.

Frequently Asked Questions

How do you determine domain relationships?

We analyze multiple signals: shared nameservers, mail servers, IP addresses, WHOIS data, SSL certificates, analytics IDs, and historical DNS records.

What is the confidence score?

Our ML model assigns probability scores indicating likelihood of same ownership or business relationship based on infrastructure overlap patterns.

Can this find hidden domains?

Yes, domain graph analysis often reveals domains not publicly associated with an organization but connected through shared infrastructure.

Is this useful for security?

Absolutely. Security teams use graph analysis for threat intelligence, fraud investigation, phishing infrastructure mapping, and attack surface discovery.

Map Domain Relationships

Start for free with 10,000 credits per month. Start checking domains in seconds.

View Full API Documentation