Subdomain Enumeration API

Discover subdomains in real time and map your full attack surface. Structured JSON responses built for security teams and OSINT workflows.

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What is Subdomain Enumeration?

Subdomain enumeration is the process of discovering subdomains associated with a root domain. It helps identify hidden services, staging environments, forgotten infrastructure and shadow IT assets.

The IP Ninja Subdomain Enumeration API aggregates intelligence sources to provide reliable, structured JSON results ready for automation.

Subdomain API Example

curl -H "x-ninja: YOUR_API_KEY" https://ip-ninja.com/api/v1/subdomains/bugcrowd.com 
{
  "subdomains": [
    "explore.bugcrowd.com",
    "stream.a.bugcrowd.com",
    "docs.bugcrowd.com",
    "pages.bugcrowd.com",
    "stargate.a.bugcrowd.com",
    "gateway.a.bugcrowd.com",
    "go.bugcrowd.com",
    "ww1.bugcrowd.com",
    "tracker.bugcrowd.com",
    "documentation.bugcrowd.com",
    "ww2.bugcrowd.com",
    "researcherdocs.bugcrowd.com",
    "levelup.bugcrowd.com",
    "www.bugcrowd.com",
    "itmoah.bugcrowd.com",
    "hooks.a.bugcrowd.com",
    "blog.bugcrowd.com",
    "forum.bugcrowd.com",
    "assetinventory.bugcrowd.com",
    "bounce.bugcrowd.com"
  ]
}

Why Subdomain Discovery Matters for Security

Subdomains are often overlooked but represent significant security exposure. Attackers frequently target forgotten or misconfigured subdomains.

Explore the Full IP Ninja OSINT API

Subdomain enumeration becomes even more powerful when combined with our other infrastructure intelligence endpoints.

Reverse IP Lookup API

Discover domains hosted on a specific IP address.

Learn more →

WHOIS JSON API

Retrieve structured WHOIS data for domains and IP addresses.

Learn more →

IP Geolocation API

Enrich IP addresses with ASN and geographic intelligence.

Learn more →

Unified Pricing

One API key. Multiple endpoints. Flexible subscription tiers.

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Frequently Asked Questions

How does the Subdomain Enumeration API work?

It aggregates passive intelligence sources and DNS data to provide a comprehensive list of subdomains associated with a domain.

Is the output returned in JSON format?

Yes. All subdomain results are returned in structured JSON for easy automation and integration.

Can I combine this with other endpoints?

Absolutely. Subdomain discovery works seamlessly with Reverse IP, WHOIS and IP Geolocation endpoints.

Is it suitable for continuous monitoring?

Yes. The API can be integrated into monitoring pipelines to detect new subdomains as they appear.

Discover Hidden Subdomains Instantly

Map your full attack surface with a single API key — part of the IP Ninja OSINT intelligence platform.

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