Nummeropslag
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Privacy-first Danish caller ID, CVR company lookup, operator data, and spam signals.
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- andrey-tut
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- Search, Knowledge Base, Other
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Setup
Install Nummeropslag in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/andrey-tut/nummeropslag-api
Follow the installation instructions in the repository README, then restart your MCP client.
PublicPartner API+MCP serverfor Danish phone-number lookup, caller-ID and spam/trust signals.
Identify who is calling from a Danish number: company from the officialCVRregister,telecom operator, number type, and aspam/trust verdictbased on anonymous user reports. Powered by official open data — not scraping. Use it from any HTTP client, or plug theMCP serverstraight into Claude and other AI agents.
🌐 Service:nummeropslag.dk· 🔑 Get a key:/api-noegle· 📖 API reference:Redoc· 🧪 Live sandbox:/api-reference· 🤖MCP
This repository containsonly public API docs, the OpenAPI spec, client examples and the MCP server. The backend source is private.
All endpoints require an API key, sent in theX-API-Keyheader:
Each key has aplan, a set ofscopes(lookup,spam,operator) and arequest quota. Check your key status any time viaGET /api/v1/partner/me.
Base URL:https://nummeropslag.dk/api/v1
{e164}accepts an 8-digit Danish number or full E.164 — e.g.33633363or+4533633363.
Full machine-readable contract:openapi/openapi.yaml·openapi/openapi.json.
export NUMMEROPSLAG_API_KEY=npk_your_key_here curl -H "X-API-Key: $NUMMEROPSLAG_API_KEY" \ https://nummeropslag.dk/api/v1/partner/spam/33633363
Ready-to-run, dependency-free clients inexamples/:
All read the key from theNUMMEROPSLAG_API_KEYenvironment variable.
Use Nummeropslag as native nodes and tools in popular automation and AI workflow builders:
The integrations store the API key in each platform's credential/secret system and send queries only tohttps://nummeropslag.dk.
Give your AI agent (Claude Desktop, Claude Code, or anyModel Context Protocolclient) direct access to Danish phone-number data. The server inmcp/wraps the Partner API as MCP tools — same official data, same privacy rules (no names of private individuals).
Download the latestnummeropslag-mcp-.mcpbbundle fromGitHub Releases, open it with a compatible desktop client, and enter your Nummeropslag API key when prompted. The bundle uses the manageduvruntime, so users do not need to install Python dependencies manually.
The canonical registry identifier isio.github.andrey-tut/nummeropslag.
The same stdio server is published as a public OCI image:
docker run --rm -i \ -e NUMMEROPSLAG_API_KEY=npk_your_key_here \ ghcr.io/andrey-tut/nummeropslag-mcp:latest
MCP calls are metered against aseparate MCP quota(not your REST quota); the server sendsX-Client: mcpautomatically.
pip install nummeropslag-mcp # or: uvx nummeropslag-mcp export NUMMEROPSLAG_API_KEY=npk_your_key_here # https://nummeropslag.dk/api-noegle nummeropslag-mcp # stdio transport
Add to Claude Desktop(claude_desktop_config.json)or Claude Code(.mcp.json):
{ "mcpServers": { "nummeropslag": { "command": "nummeropslag-mcp", "env": { "NUMMEROPSLAG_API_KEY": "npk_your_key_here" } } } }
pip install "mcp[cli]" httpx python mcp/server.py
…and use"command": "python", "args": ["/absolute/path/to/nummeropslag-api/mcp/server.py"]in the config above.
Restart your client, then ask e.g."Is +45 70 10 20 30 spam?"or"Who owns 33 63 33 63?"*.
{ "error": { "code": "forbidden", "message": "…", "details": {} } }
Common codes:unauthorized(missing/invalid key),forbidden(scope not allowed),rate_limited(quota exceeded),not_found.
- Core data: officialCVR(companies + production units) and the Danishnumber plan(SDFI, CC0).
- Spam verdicts usek-anonymity— a public "spam" label requires several independent reports.
- Names of private individuals are never exposed.Contacts are never uploaded (GDPR-compliant).
The MCP server sends only the phone number or business query requested by the user to the first-party Nummeropslag API. It does not read conversations, files, contacts, or call logs. See the fullNummeropslag privacy policyfor data collection, use, retention, sharing, and contact information.
The client examples and OpenAPI spec in this repository are released under theMIT License(seeLICENSE) — copy and adapt them freely. The Nummeropslag API service itself and its data are proprietary; use is governed by the terms atnummeropslag.dk.
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