Find every domain that looks like yours.

Pass a seed domain. Get back the cluster of domains that share registrar, registrant, name server, certificate, or string-similarity signals.

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WHAT THIS API RETURNS

Cluster the corpus around any seed.

The Associated Domain Finder API surfaces the cluster of domains that share signal with a given seed. Association can be by exact ownership match, by infrastructure overlap, or by string-similarity to the seed name. The API runs the cluster query against the full indexed corpus.

Pass the seed and the optional association parameter to scope the cluster (registrant, registrar, name server, certificate, or name-similarity). Use strict to control how aggressive the matching is, and include_subdomains to expand to the FQDN level.

Use this when you need infrastructure clustering as a hunt or attribution input, brand-impersonation graphs around a seed name, or M&A inheritance discovery from a known apex.

REQUEST

One endpoint, one required parameter.

Endpoint:

GET https://api.deepinfo.com/v1/discovery/associated-domain-finder?domain={domain}

Parameters:

Name	In	Type	Required	Description
domain	query	string	Yes	Seed domain such as `deepinfo.com`.
association	query	enum	No	Association dimension: registrant, registrar, name_server, certificate, or name_similarity. Defaults to a multi-signal blend.
strict	query	boolean	No	Tighter matching when true; broader cluster when false.
include_subdomains	query	boolean	No	When true, surface FQDNs in addition to apex domains.
page	query	integer	No	Page number for paginated responses. Defaults to 1.
page_size	query	integer	No	Page size for paginated responses. Defaults to a sensible per-endpoint limit; see docs.
ordering	query	string	No	Field to sort by; prefix with `-` for descending order.
export	query	boolean	No	When true, returns the full result set as a downloadable export instead of paginated JSON.
export_format	query	enum	No	Format of the export when `export=true`. Typically `json` or `csv`.
export_scope	query	enum	No	Subset of fields to include in the export. See the docs for per-endpoint scopes.

Authentication is by API token in the request header. See docs.deepinfo.com for the full request reference.

SAMPLE RESPONSE

See what the API returns.

Real response structure for the Find every domain that looks like yours endpoint. Field coverage may vary based on query parameters and data availability.

JSON RESPONSE

{
  "_request": {"domain": "deepinfo.com", "association": "registrant"},
  "results": [
    {"fqdn": "deepinfo.com", "association_signal": "seed"},
    {"fqdn": "deepinfo.io", "association_signal": "registrant_match", "confidence": 0.96},
    {"fqdn": "deepinfo.net", "association_signal": "registrant_match", "confidence": 0.96},
    {"fqdn": "dofo.com", "association_signal": "registrant_match", "confidence": 0.91}
  ],
  "pagination": {"page": 1, "page_size": 50, "total": 12}
}

STRUCTURED VIEW

Request

Domain

deepinfo.com

Association

registrant

Results

Count

First fqdn

deepinfo.com

First association signal

seed

Pagination

Page

Page size

Total

Sample response shown. Real responses depend on query parameters, data availability, and API version. Talk to us for full schema documentation.

USE CASES

“Clustering by registrar, registrant, and certificate signal in one call is exactly the pivot we used to do across four separate APIs. Investigation timelines shortened measurably once we consolidated.”

— Threat Intelligence Analyst, Managed Detection and Response Provider

CONTINUE EXPLORING

Other discovery APIs.

API

GET STARTED

Run a finder against your seed, or have us walk you through the dimensions.

We'll set up token access and discuss which association dimensions fit your workflow.

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Find every domain that looks like yours.

Cluster the corpus around any seed.

One endpoint, one required parameter.

See what the API returns.

Workflows this API plugs into directly.

Brand Impersonation Protection

Threat Hunting

Mergers and Acquisitions Due Diligence

Other discovery APIs.

Search the global domain corpus, by any field.

Everything Deepinfo knows about one domain, in one call.

Every subdomain under any apex, in one call.

Every TLD permutation of a name, in one call.

Find every domain registered to an email.

Domains registered at the same moment.

Run a finder against your seed, or have us walk you through the dimensions.