numberRank MCP

An MCP server that allows agents to check if a phone number is VoIP or a real carrier line, providing line type, score, grade, and verdict based on Twilio Lookup data. It supports checking individual numbers and accessing a directory of companies graded by their public phone numbers.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by numberRank

MCP endpoint (Streamable HTTP)

https://numberrank.dev/mcp

Vendor documentation

What its tools do

2 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

2 of 2 have a description · 2 of 2 declare behavior hints · 1 of 1 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 2:47 PM UTC
Passed Official MCP Registry namespace is tied to numberrank.dev · Nov 6, 2026, 2:37 PM UTC
Passed Endpoint is on the registry namespace domain · Nov 6, 2026, 2:37 PM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Check if a phone number is VoIP or real carrier
Get line type score and grade for fraud prevention
Access directory of companies by phone number type

Source and maintenance

Vendor evidenceRegistry 1.0.0

mcp-registry: dev.numberrank/numberrank@1.0.0 Project website

Protocol and capabilities

Server: numberrank 1.0.0
MCP protocol negotiated in check: 2025-11-25
Tools: 2 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

check_number tells you whether a phone number is VoIP or a real carrier line. directory lists AI agent phone providers by line type.

Tools

2 advertised

check_number — Check a phone number's line type

Advertised by the server during the last successful anonymous check.

Advertised read-onlyOpen-world

Tells you whether a phone number is VoIP or a real carrier line, with a 0 to 100 score and letter grade, using Twilio Lookup line type intelligence. Use it before relying on a number for SMS or OTP verification. US numbers can be 10 digits; any other country needs + and the country code.

check_number input schema

{
  "type": "object",
  "required": [
    "number"
  ],
  "properties": {
    "number": {
      "type": "string",
      "description": "Phone number, for example +15551234567"
    }
  }
}

check_number annotations

{
  "title": "Check a phone number's line type",
  "readOnlyHint": true,
  "openWorldHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}

directory — List AI agent phone providers by line type

Advertised by the server during the last successful anonymous check.

Advertised read-only

Returns the numberRank directory: AI agent phone providers and personal agents graded by whether their published and provisioned numbers read as real carrier lines or VoIP. Numbers are masked.

directory input schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

directory annotations

{
  "title": "List AI agent phone providers by line type",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 408 ms
95th percentile latency: 408 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 6, 2026, 2:47 PM UTC · probe · passed · 408 ms · metadata changed · 2 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http numberrank-mcp https://numberrank.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add numberrank-mcp --url https://numberrank.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable numberrank-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "numberrank-mcp": {
      "url": "https://numberrank.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "numberrank-mcp": {
      "type": "streamableHttp",
      "url": "https://numberrank.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start numberrank-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "numberrank-mcp": {
      "type": "http",
      "url": "https://numberrank.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http numberrank-mcp https://numberrank.dev/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://numberrank.dev/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "numberrank-mcp": {
      "serverUrl": "https://numberrank.dev/mcp"
    }
  }
}

Let your agent find its tools

Find servers like numberRank MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

Connect Koskamo Explore workflows

See all 7,801

Do you run numberRank MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing