Subdomain Discovery API

Identify Known Subdomains for any Domain

Our Subdomain Discovery API provides a comprehensive list of subdomains associated with a given domain, leveraging our industry-leading domain name data.

Use it to uncover hidden infrastructure, monitor domain exposure, and enhance your asset discovery workflows.

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Why Choose ViewDNS.info Subdomain Discovery API?

  • Identify Assets Belonging to Your Organisation
  • Constant Updates Ensure Up-To-Date Results
  • Identify Relationships Between Domains
  • Highly Scalable to meet Business Needs
  • Subscription Includes Access to ALL ViewDNS.info APIs

Our Valued Customers Include:

Blizzard DuckDuckGo Kaspersky NTT LaPoste

Key Subdomain Discovery API Features

Up-to-date Data

Our API leverages a backend that continuously monitors and indexes subdomain data across hundreds of millions of domains, ensuring the most up-to-date and comprehensive subdomain results are available.

Asset Discovery

Our Subdomain Discovery API allows for the discovery of potentially unknown assets used by your organisation in order to ensure you have a comprehensive picture of your internet footprint.

Identify Connections

Our API reveals connections between domain names that may appear unrelated by uncovering shared or structurally similar subdomains.

Highly Scalable

Our Subdomain Discovery API employs a highly scalable backend ensuring that even high volume searches are met with the highest success rate.

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Usage Details

Finds all known subdomains for a given domain name.

/subdomains GET

https://api.viewdns.info/subdomains/

Search by domain name. By default, the first 1,000 results are returned.

Parameters

  • apikey required

    Your API key associated with your ViewDNS.info account.

  • domain required

    The domain name to retrieve subdomains for (e.g., example.com).

  • page optional (default=1)

    The page of results to display (e.g. '2' to view results 1,001 to 2,000).

  • output optional (default=json)

    The output format required ('xml' or 'json').

Sample Request Live Demo!

https://api.viewdns.info/subdomains/?domain=example.com&apikey=demo&output=json

Sample Response

{
  "query": {
    "tool": "subdomains_PRO",
    "domain": "example.com"
  },
  "response": {
    "subdomain_count": "5",
    "total_pages": "1",
    "current_page": "1",
    "subdomains": [
      {
        "name": "dev.example.com",
        "ips": [],
        "last_resolved": null
      },
      {
        "name": "m.example.com",
        "ips": [],
        "last_resolved": null
      },
      {
        "name": "products.example.com",
        "ips": [],
        "last_resolved": null
      },
      {
        "name": "support.example.com",
        "ips": [],
        "last_resolved": null
      },
      {
        "name": "www.example.com",
        "ips": [],
        "last_resolved": null
      }
    ]
  }
}

Code Example