Heade.rs

Heade.rs provides a free, fast, web‑based tool for looking up domain names, IP addresses, and autonomous system numbers. It returns hosting details, DNS records, registration data, email policies, TLS certificates, and network routing information. The service is built on Claude Code and runs on Cloudflare, offering a simple HTTP API that can be queried with curl or integrated into MCP clients without authentication.

Heade.rs publishes 1 API contract indexed on the APIs.io network: Heade.rs API. Tagged areas include Company, DNS, IP, Networks, and Tool.

The Heade.rs catalog on APIs.io includes 1 Spectral governance ruleset.

🌐 Visit website 📡 Profile data on GitHub

20.9/100 emerging Agent 27/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

Company DNS IP Networks Tool

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 20.9/100 · emerging

Contract Quality 10.0 / 21

Developer Ergonomics 0.3 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.5 / 11

Contract Governance 1.9 / 10

Discoverability 6.4 / 9

Regulatory Posture 0.7 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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

Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points Ask about this →
Developer Ergonomics scores 1.8 — up to +19.6 composite points Ask about this →
Contract Quality scores 47.1 — up to +13.2 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/heade-rs/apis.yml: open an issue on github.com/api-evangelist/heade-rs 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 →

Standards implemented 2

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 1

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

Heade.rs Heade.rs API

The Heade.rs API API from Heade.rs — 1 operation(s) for heade.rs api.

MCP Servers 1

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

Heade.rs MCP Server

Remote MCP server at heade.rs.

MCP SERVER

Agent Skills 1

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

lookup

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Heade.rs API Rules

36 rules · 34 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 1

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

Heade.rs Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Heade.rs Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: heade-rs
name: Heade.rs
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://heade.rs/og.png
description: Heade.rs provides a free, fast, web‑based tool for looking up domain names, IP addresses, and autonomous system
  numbers. It returns hosting details, DNS records, registration data, email policies, TLS certificates, and network routing
  information. The service is built on Claude Code and runs on Cloudflare, offering a simple HTTP API that can be queried
  with curl or integrated into MCP clients without authentication.
url: https://artifacts.apis.io/heade-rs/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-11 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-11'
modified: '2026-11-11'
tags:
- Company
- DNS
- IP
- Networks
- Tool
tags_raw:
- Company
- DNS
- IP
- Network
- API
- Tool
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/heade-rs-agentic-access.yml
- type: Spectral
  url: rules/heade-rs-rules.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Conformance
  url: conformance/heade-rs-conformance.yml
- type: LLMsTxt
  url: llms/heade-rs-llms.txt
- type: ToolCrosswalk
  url: mcp/heade-rs-tool-crosswalk.yml
- type: MCPServer
  url: mcp/heade-rs-mcp.yml
- type: WellKnown
  url: well-known/heade-rs-well-known.yml
- type: Hosts
  url: hosts/heade-rs-hosts.yml
- type: Vendors
  url: vendors/heade-rs-vendors.yml
- type: GitHubOrganization
  url: https://github.com/seeARMS
- type: DomainSecurity
  url: security/heade-rs-domain-security.yml
- type: Website
  url: https://heade.rs/
apis:
- aid: heade-rs:heade-rs-heade-rs-api-api
  name: Heade.rs Heade.rs API
  description: The Heade.rs API API from Heade.rs — 1 operation(s) for heade.rs api.
  humanURL: https://heade.rs/api
  baseURL: https://heade.rs
  tags:
  - Heade.rs API
  properties:
  - type: OpenAPI
    url: openapi/heade-rs-heade-rs-api-api-openapi.yml
x-enrichment:
  date: '2026-11-11'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Heade.rs API — frequently asked questions

Does Heade.rs have an API?

Yes. APIs.io lists 1 API from Heade.rs, including Heade.rs Heade.rs API.

Is there an OpenAPI specification for the Heade.rs API?

Yes. APIs.io indexes 1 OpenAPI specification for Heade.rs, each linked for download from this page.

Does Heade.rs have an MCP server?

Yes. APIs.io lists 1 MCP server for Heade.rs: Remote MCP server at heade.rs.

Is the Heade.rs API ready for AI agents?

Heade.rs has a Kin Score of 20.9 out of 100 (emerging) and an Agent Readiness score of 27.0 (agent-aware), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

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