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 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

35.7/100 thin ▬ flat Agent 23/100 agent aware saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

2 APIs

DNS DNS History Domain Intelligence DomainsNameserversThreat Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 35.7/100 · thin

Contract Quality 11.3 / 21

Developer Ergonomics 5.5 / 17

Access Clarity 5.6 / 17

Operational Transparency 0.9 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/completedns: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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 5

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

API Collection

OPEN COLLECTION

CompleteDNS API v1 DNS History API

OPEN COLLECTION

CompleteDNS API v1 DNS History NS History API

OPEN COLLECTION

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

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

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

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
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
position: Consuming
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: '0.23'
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: Website
  url: https://www.completedns.com/
- 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

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