CompleteDNS website screenshot

CompleteDNS

CompleteDNS is a DNS research platform that tracks nameserver modifications and domain drops, with over twenty years of history and billions of recorded changes. The CompleteDNS API exposes domain-scoped lookups that return the chronological history of nameserver changes, drop events, and parking status for a given domain. Both a current v2 API and a legacy v1 API are available, authenticated by API key.

CompleteDNS publishes 2 APIs on the APIs.io network: DNS History API and NS History API. Tagged areas include DNS, DNS History, Domain Intelligence, Domains, and Nameservers.

The CompleteDNS catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

CompleteDNS’s developer surface includes authentication, developer portal, documentation, signup flow, pricing, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
57.8/100 strong ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
2 APIs
DNSDNS HistoryDomain IntelligenceDomainsNameserversThreat Intelligence

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 57.8/100 · strong
Contract Quality 16.5 / 25
Developer Ergonomics 6.5 / 20
Commercial Clarity 16.8 / 20
Operational Transparency 4.1 / 13
Governance 7.0 / 12
Discoverability 6.9 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/completedns: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

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

CompleteDNS DNS History API

Nameserver and drop history for a domain

CompleteDNS NS History API

Nameserver history (legacy) for a domain

Postman Collections 2

Ready-to-run Postman collections for exercising this provider's APIs.

CompleteDNS API v1 DNS History API

POSTMAN

CompleteDNS API v1 DNS History NS History API

POSTMAN

Open Collections 2

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

CompleteDNS API v1

OPEN COLLECTION

CompleteDNS API v2

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Completedns Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Completedns Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Completedns Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Completedns Context

0 classes · 3 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

CompleteDNS API Rules

5 rules · 4 warnings 1 info

SPECTRAL

CompleteDNS API Rules

10 rules · 4 errors 5 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

CompleteDNS DNS History

6 properties

JSON SCHEMA

Security Posture 2

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

Completedns Authentication

apiKey · 1 scheme

SECURITY

Completedns Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Completedns Agentic Access

2 operations

2 operations · 0 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal
Portal
 Signup
Signup
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 JSONSchema
JSONSchema

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD
JSONLD

Build 1

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace
PostmanWorkspace

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

Contact
Contact

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Source (apis.yml)

apis.yml Raw ↑ 
aid: completedns
name: CompleteDNS
description: CompleteDNS is a DNS research platform that tracks nameserver modifications and domain drops, with over twenty
  years of history and billions of recorded changes. The CompleteDNS API exposes domain-scoped lookups that return the chronological
  history of nameserver changes, drop events, and parking status for a given domain. Both a current v2 API and a legacy v1
  API are available, authenticated by API key.
type: Index
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/completedns.png
url: https://raw.githubusercontent.com/api-evangelist/completedns/refs/heads/main/apis.yml
tags:
- DNS
- DNS History
- Domain Intelligence
- Domains
- Nameservers
- Threat Intelligence
created: '2025-02-09'
modified: '2026-05-19'
specificationVersion: '0.19'
kind: company
apis:
- aid: completedns:completedns-dns-history-api
  name: CompleteDNS DNS History API
  description: Nameserver and drop history for a domain
  humanURL: https://completedns.com/api/documentation/v2
  baseURL: https://api.completedns.com/v2
  tags:
  - DNS History
  properties:
  - type: OpenAPI
    url: openapi/completedns-dns-history-api-openapi.yml
  - type: Documentation
    url: https://completedns.com/api/documentation/v2
  - type: SpectralRules
    url: rules/completedns-rules.yml
  - type: Documentation
    url: https://completedns.com/api/documentation/v1
- aid: completedns:completedns-ns-history-api
  name: CompleteDNS NS History API
  description: Nameserver history (legacy) for a domain
  humanURL: https://completedns.com/api/documentation/v2
  baseURL: https://api.completedns.com/v2
  tags:
  - NS History
  properties:
  - type: OpenAPI
    url: openapi/completedns-ns-history-api-openapi.yml
  - type: Documentation
    url: https://completedns.com/api/documentation/v2
  - type: SpectralRules
    url: rules/completedns-rules.yml
  - type: Documentation
    url: https://completedns.com/api/documentation/v1
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/completedns/overview
- type: AgenticAccess
  url: agentic-access/completedns-agentic-access.yml
- type: DomainSecurity
  url: security/completedns-domain-security.yml
- type: Authentication
  url: authentication/completedns-authentication.yml
- type: Portal
  url: https://completedns.com/
- type: Documentation
  url: https://completedns.com/api/documentation/v2
- type: Signup
  url: https://completedns.com/register
- type: Login
  url: https://completedns.com/login
- type: Pricing
  url: https://completedns.com/pricing
- type: Contact
  url: https://completedns.com/contact
- type: TermsOfService
  url: https://completedns.com/terms
- type: PrivacyPolicy
  url: https://completedns.com/privacy
- type: JSONLD
  url: json-ld/completedns-context.jsonld
- type: JSONSchema
  url: json-schema/completedns-dns-history-schema.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com