Public IP signals (cloud hosting, Tor exits) and Maskbreak API status for fraud checks.
Look up limited public IP intelligence — cloud-hosting ranges and Tor exit nodes — from Claude, Cursor, or another MCP client. Powered by the Maskbreak fraud detection API. Requires Node.js 18+ for the local server.
| Tool | What it does |
|---|---|
lookup_ip | Public IPv4/IPv6 lookup: known, allow / review / block, risk score, and nullable signal/network metadata. Public-feed coverage is limited to cloud hosting and Tor. |
service_status | Maskbreak API health, uptime, and latency |
Grab a free API key at maskbreak.com/signup (1,000 lookups/hour, shared with evaluations, no card). Keyless mode uses the free web-tool endpoint, limited to 12 lookups/minute and 80/day per caller IP. Additional endpoint and abuse-protection limits can apply.
Neither mode performs a browser visit. VPN/proxy and device evidence require a browser-SDK-backed /v1/evaluate request outside these tools; service names are available only when known. Unknown IPs, false signals and allow verdicts are not proof of safety.
claude mcp add sentinel -e SENTINEL_API_KEY=sk_live_your_key -- npx -y @sentinelsup/mcp
Add to claude_desktop_config.json:
{
"mcpServers": {
"sentinel": {
"command": "npx",
"args": ["-y", "@sentinelsup/mcp"],
"env": { "SENTINEL_API_KEY": "sk_live_your_key" }
}
}
}
Any client that speaks stdio MCP works the same way: command npx, args ["-y", "@sentinelsup/mcp"], env SENTINEL_API_KEY.
Prefer a remote server? The same tools are hosted at https://maskbreak.com/mcp (Streamable HTTP). Point any URL-based MCP client at it; pass your API key as an Authorization: Bearer header for full quota.
"What public-feed evidence is available for this IP?"
Illustrative unknown-IP response, not a live lookup:
{
"ip": "192.0.2.1",
"known": false,
"verdict": "allow",
"risk_score": 0,
"signals": null,
"network": null
}
| Variable | Required | Default | Purpose |
|---|---|---|---|
SENTINEL_API_KEY | recommended | — | API key from your dashboard; unlocks 1,000 lookups/hour |
SENTINEL_BASE_URL | no | https://maskbreak.com | Override for testing |
Both tools return MCP isError: true for HTTP failures, malformed responses or requests that exceed the five-second timeout (including body reads). An unavailable lookup is not an allow decision.
npm ci --ignore-scripts
npm test
npm pack --dry-run --ignore-scripts
npm audit
Tests use a real stdio MCP client with loopback HTTP fixtures, without production keys. CI checks Node.js 18, 22 and 24. No package is published by these checks.
MIT © Sentinel Edge Networks LTD
Source-derived launch command. Check the maintainer’s required arguments and credentials before running:
npx -y @sentinelsup/mcpMerge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.
{
"mcpServers": {
"com-maskbreak-mcp": {
"command": "npx",
"args": [
"-y",
"@sentinelsup/mcp"
]
}
}
}Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.
Claude Desktop setup referenceMaskbreak works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.
~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.~/.cursor/mcp.jsonRestart Cursor for changes to take effect..vscode/mcp.jsonReload VS Code window for changes to take effect.~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect..mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.