DomainTools

DomainTools is a domain and DNS intelligence company whose APIs power threat investigation, hunting, and monitoring for security teams. Its product surface spans Iris Investigate (pivot-based domain investigation), Iris Enrich (bulk domain enrichment), and Iris Detect (brand-infringement monitoring); the Farsight DNSDB passive DNS history API (300+ billion records); Lookups & Monitors (WHOIS, RDAP, hosting history, reverse IP/WHOIS, reputation, risk score, and change monitors); Threat Feeds (predictive risk and discovery feeds with RPZ integration); and Farsight SIE real-time DNS event streaming. DomainTools publishes OpenAPI specifications, an official Python SDK with a bundled CLI, and a remotely hosted MCP server for AI agents. A Battery Ventures portfolio company, enriched into the API Evangelist network.

DomainTools publishes 12 API contracts indexed on the APIs.io network, including Flex search API, Information API, Iris Detect API, and 9 more. Tagged areas include Company, Threat Intelligence, Domain Intelligence, DNS, and WHOIS.

The DomainTools catalog on APIs.io includes 1 Spectral governance ruleset.

DomainTools’ developer surface includes engineering blog, documentation, API reference, getting-started guide, authentication, support, signup flow, and 26 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

50.0/100 developing ▬ flat Agent 56/100 agent ready Front door AI 4/6 moderate Heartbeat 96/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

4 published contracts 1 MCP Servers 4 Agent Skills

Company Threat Intelligence Domain Intelligence DNS WHOIS Passive DNS Cybersecurity Domain Monitoring Risk Scoring Security

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Cybersecurity Management

BC-620

Iris InvestigateLookups

GET /v1/reputation/ GET /v1/risk/

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 50.0/100 · developing

Contract Quality 9.2 / 19

Developer Ergonomics 11.0 / 15

Access Clarity 5.1 / 15

Operational Transparency 4.1 / 10

Contract Governance 1.6 / 9

Discoverability 6.0 / 8

Regulatory Posture 3.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 56/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter
Well-Known Catalog +4 pts — common[].type includes WellKnown, APICatalog, or api-catalog

1 more unmet check in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 34.2 — up to +13.2 composite points
Contract Quality scores 48.8 — up to +12.8 composite points
Contract Governance scores 18.2 — up to +9.8 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/domaintools/apis.yml: open an issue on github.com/api-evangelist/domaintools to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Domains and DNS (registrars, registries, DNS)	builds-on	46.1	-	-
ServiceNow Store (partner apps + ServiceNow Certified App)	builds-on	46.1	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 5

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

DNS

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

DomainTools Flex search API

The Flex search API from DomainTools — 2 operation(s) for flex search.

DomainTools Information API

Access the latest information about your account, including service limits.

DomainTools Iris Detect API

Iris Detect is an Internet infrastructure detection, monitoring, and enforcement tool. It rapidly discovers malicious domains that are engaged in brand impersonation, risk-score...

DomainTools Iris Enrich API

Designed to support high query volumes with batch processing and fast response times, the Iris Enrich API provides actionable insights-at-scale with enterprise-scale ingestion o...

DomainTools Iris Investigate API

The Iris Investigate API is ideally suited for investigate and orchestrate use cases at human scale. Identify threats, map adversary infrastructure, and streamline investigations.

DomainTools Lookups API

Endpoints for retrieving detailed information about domains and IPs, and for finding connections between domains and infrastructure.

DomainTools Monitors API

Endpoints for monitoring new domain registrations, changes to IP ranges, and other key infrastructure events based on specific terms.

DomainTools Ping API

The Ping API from DomainTools — 1 operation(s) for ping.

DomainTools Rate Limit API

The Rate Limit API from DomainTools — 1 operation(s) for rate limit.

DomainTools rdata Lookups API

The rdata Lookups API from DomainTools — 4 operation(s) for rdata lookups.

DomainTools rrset Lookups API

The rrset Lookups API from DomainTools — 6 operation(s) for rrset lookups.

DomainTools Siebatchd API

The Siebatchd API from DomainTools — 4 operation(s) for siebatchd.

Scroll for all 12

Open Collections 12

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

dnsdb Flex search API

OPEN COLLECTION

dnsdb Flex search Information API

OPEN COLLECTION

dnsdb Flex search Iris Detect API

OPEN COLLECTION

dnsdb Flex search Iris Enrich API

OPEN COLLECTION

dnsdb Flex search Iris Investigate API

OPEN COLLECTION

dnsdb Flex search Lookups API

OPEN COLLECTION

dnsdb Flex search Monitors API

OPEN COLLECTION

dnsdb Flex search Ping API

OPEN COLLECTION

dnsdb Flex search Rate Limit API

OPEN COLLECTION

dnsdb Flex search rdata Lookups API

OPEN COLLECTION

dnsdb Flex search rrset Lookups API

OPEN COLLECTION

dnsdb Flex search Siebatchd API

OPEN COLLECTION

Scroll for all 12

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

DomainTools MCP Server

Remote MCP server at api.domaintools.com over HTTP.

MCP SERVER

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

Bulk-enrich a list of domains

AGENT SKILL

Investigate a suspicious domain

AGENT SKILL

Monitor a brand for lookalike domains

AGENT SKILL

Pivot through passive DNS history

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

DomainTools API Rules

59 rules · 48 errors 9 warnings 2 info

SPECTRAL

OpenAPI Overlays 4

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Domaintools Dnsdb Overlay

1 action · update · domaintools-dnsdb-openapi.yml

DERIVED

Domaintools Iris Overlay

1 action · update · domaintools-iris-openapi.yml

DERIVED

Domaintools Lookups Monitors Overlay

1 action · update · domaintools-lookups-monitors-openapi.yml

DERIVED

Domaintools Sie Overlay

1 action · update · domaintools-sie-openapi.yml

DERIVED

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Domaintools Authentication

apiKey/http · 4 schemes

SECURITY

Domaintools Domain Security

TLSv1.3 · HSTS · DNSSEC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Domaintools Agentic Access

52 operations · 9 acting · 1 human-in-the-loop

52 operations · 9 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

AgentSkill

WellKnown

AgenticAccess

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

Conformance

DataModel

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

ChangeLog

StatusPage

Deprecation

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 4

The organization behind the API

Blog

BlogRSS

Website

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: domaintools
name: DomainTools
description: DomainTools is a domain and DNS intelligence company whose APIs power threat investigation, hunting, and monitoring
  for security teams. Its product surface spans Iris Investigate (pivot-based domain investigation), Iris Enrich (bulk domain
  enrichment), and Iris Detect (brand-infringement monitoring); the Farsight DNSDB passive DNS history API (300+ billion records);
  Lookups & Monitors (WHOIS, RDAP, hosting history, reverse IP/WHOIS, reputation, risk score, and change monitors); Threat
  Feeds (predictive risk and discovery feeds with RPZ integration); and Farsight SIE real-time DNS event streaming. DomainTools
  publishes OpenAPI specifications, an official Python SDK with a bundled CLI, and a remotely hosted MCP server for AI agents.
  A Battery Ventures portfolio company, enriched into the API Evangelist network.
url: https://raw.githubusercontent.com/api-evangelist/domaintools/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- battery-ventures
x-tier: enriched
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.domaintools.com/wp-content/uploads/dt-logo.png
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Threat Intelligence
- Domain Intelligence
- DNS
- WHOIS
- Passive DNS
- Cybersecurity
- Domain Monitoring
- Risk Scoring
- Security
apis:
- aid: domaintools:domaintools-flex-search-api
  name: DomainTools Flex search API
  description: The Flex search API from DomainTools — 2 operation(s) for flex search.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Flex search
  properties:
  - type: OpenAPI
    url: openapi/domaintools-flex-search-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-information-api
  name: DomainTools Information API
  description: 'Access the latest information about your account, including service

    limits.'
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Information
  properties:
  - type: OpenAPI
    url: openapi/domaintools-information-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-iris-detect-api
  name: DomainTools Iris Detect API
  description: 'Iris Detect is an Internet infrastructure detection, monitoring, and enforcement tool.

    It rapidly discovers malicious domains that are engaged in brand impersonation, risk-scores them within minutes, and supports
    your automation of detection, escalation, and enforcement actions.'
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Iris Detect
  properties:
  - type: OpenAPI
    url: openapi/domaintools-iris-detect-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-iris-enrich-api
  name: DomainTools Iris Enrich API
  description: Designed to support high query volumes with batch processing and fast response times, the Iris Enrich API provides
    actionable insights-at-scale with enterprise-scale ingestion of DomainTools data
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Iris Enrich
  properties:
  - type: OpenAPI
    url: openapi/domaintools-iris-enrich-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-iris-investigate-api
  name: DomainTools Iris Investigate API
  description: The Iris Investigate API is ideally suited for investigate and orchestrate use cases at human scale. Identify
    threats, map adversary infrastructure, and streamline investigations.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Iris Investigate
  properties:
  - type: OpenAPI
    url: openapi/domaintools-iris-investigate-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-lookups-api
  name: DomainTools Lookups API
  description: Endpoints for retrieving detailed information about domains and IPs, and for finding connections between domains
    and infrastructure.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Lookups
  properties:
  - type: OpenAPI
    url: openapi/domaintools-lookups-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-monitors-api
  name: DomainTools Monitors API
  description: Endpoints for monitoring new domain registrations, changes to IP ranges, and other key infrastructure events
    based on specific terms.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Monitors
  properties:
  - type: OpenAPI
    url: openapi/domaintools-monitors-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-ping-api
  name: DomainTools Ping API
  description: The Ping API from DomainTools — 1 operation(s) for ping.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Ping
  properties:
  - type: OpenAPI
    url: openapi/domaintools-ping-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-rate-limit-api
  name: DomainTools Rate Limit API
  description: The Rate Limit API from DomainTools — 1 operation(s) for rate limit.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Rate-Limit
  tags_raw:
  - Rate Limit
  properties:
  - type: OpenAPI
    url: openapi/domaintools-rate-limit-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-rdata-lookups-api
  name: DomainTools rdata Lookups API
  description: The rdata Lookups API from DomainTools — 4 operation(s) for rdata lookups.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - rdata Lookups
  properties:
  - type: OpenAPI
    url: openapi/domaintools-rdata-lookups-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-rrset-lookups-api
  name: DomainTools rrset Lookups API
  description: The rrset Lookups API from DomainTools — 6 operation(s) for rrset lookups.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - rrset Lookups
  properties:
  - type: OpenAPI
    url: openapi/domaintools-rrset-lookups-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
- aid: domaintools:domaintools-siebatchd-api
  name: DomainTools Siebatchd API
  description: The Siebatchd API from DomainTools — 4 operation(s) for siebatchd.
  humanURL: https://docs.domaintools.com/api/iris/
  baseURL: https://api.domaintools.com
  tags:
  - Siebatchd
  properties:
  - type: OpenAPI
    url: openapi/domaintools-siebatchd-api-openapi.yml
  - type: APIReference
    url: https://docs.domaintools.com/api/iris/reference/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.domaintools.com/blog
  type: Blog
- url: https://www.domaintools.com/blog/rss.xml
  type: BlogRSS
- type: Website
  url: https://www.domaintools.com/
- type: CapabilityMap
  url: capabilities/domaintools-capability-edges.yml
  name: DomainTools Business Capability Map
- type: Overlay
  url: overlays/domaintools-dnsdb-overlay.yaml
- type: DeveloperPortal
  url: https://docs.domaintools.com/
- type: Documentation
  url: https://docs.domaintools.com/
- type: APIReference
  url: https://docs.domaintools.com/api/iris/reference/
- type: GettingStarted
  url: https://docs.domaintools.com/api/iris/
- type: Authentication
  url: authentication/domaintools-authentication.yml
- type: Blog
  url: https://www.domaintools.com/resources/blog/
- type: Support
  url: https://www.domaintools.com/support
- type: GitHubOrganization
  url: https://github.com/DomainTools
- type: SignUp
  url: https://www.domaintools.com/demo
- type: TermsOfService
  url: https://www.domaintools.com/company/terms-of-service/
- type: PrivacyPolicy
  url: https://www.domaintools.com/company/privacy-policy/
- type: ChangeLog
  url: changelog/domaintools-changelog.yml
- type: StatusPage
  url: https://domaintools.statuspage.io
- type: Deprecation
  url: lifecycle/domaintools-lifecycle.yml
- type: Lifecycle
  url: lifecycle/domaintools-lifecycle.yml
- type: MCPServer
  url: mcp/domaintools-mcp.yml
- type: Packages
  url: packages/domaintools-packages.yml
- type: SDKs
  url: packages/domaintools-packages.yml
- type: CLI
  url: cli/domaintools-cli.yml
- type: LLMsTxt
  url: llms/domaintools-llms.txt
- type: Conventions
  url: conventions/domaintools-conventions.yml
- type: ErrorCatalog
  url: errors/domaintools-problem-types.yml
- type: Conformance
  url: conformance/domaintools-conformance.yml
- type: DataModel
  url: data-model/domaintools-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
- type: WellKnown
  url: well-known/domaintools-well-known.yml
- type: AgenticAccess
  url: agentic-access/domaintools-agentic-access.yml
- type: DomainSecurity
  url: security/domaintools-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

DomainTools API — frequently asked questions

Does DomainTools have an API?

Yes. APIs.io lists 12 APIs from DomainTools, including DomainTools Flex search API, DomainTools Information API and DomainTools Iris Detect API, and 9 more.

Is there an OpenAPI specification for the DomainTools API?

Yes. APIs.io indexes 12 OpenAPI specifications for DomainTools, each linked for download from this page.

How do I authenticate with the DomainTools API?

DomainTools documents its authentication (apiKey/http · 4 schemes). The details are profiled on APIs.io as Domaintools Authentication.

Does DomainTools have an MCP server?

Yes. APIs.io lists 1 MCP server for DomainTools: Remote MCP server at api.domaintools.com over HTTP.

Is the DomainTools API ready for AI agents?

DomainTools has a Kin Score of 50.0 out of 100 (developing) and an Agent Readiness score of 55.5 (agent-ready), scored by API Evangelist on 2026-11-06.

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