numberRank
REMOTE · NUMBERRANK.DEV · SCANNED SEP 20
Is a phone number VoIP or a real carrier line? Line type, score and grade, free, no auth.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability74
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 164 tokens (~82/item across 2 items; 2 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management13
- Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 2 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 3 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the numberRank MCP server?
numberRank is a hosted endpoint at https://numberrank.dev/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · numberrank.dev
claude mcp add --transport http dev-numberrank-numberrank 'https://numberrank.dev/mcp'
{
"mcpServers": {
"dev-numberrank-numberrank": {
"url": "https://numberrank.dev/mcp"
}
}
} {
"servers": {
"dev-numberrank-numberrank": {
"type": "http",
"url": "https://numberrank.dev/mcp"
}
}
} [mcp_servers.dev-numberrank-numberrank] url = "https://numberrank.dev/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"dev-numberrank-numberrank": {
"type": "remote",
"url": "https://numberrank.dev/mcp",
"enabled": true
}
}
} openclaw mcp add dev-numberrank-numberrank --url 'https://numberrank.dev/mcp' --transport streamable-http
mcp_servers:
dev-numberrank-numberrank:
url: "https://numberrank.dev/mcp" {
"McpServers": {
"dev-numberrank-numberrank": {
"Transport": "http",
"Url": "https://numberrank.dev/mcp"
}
}
} assistant mcp add dev-numberrank-numberrank -t streamable-http -u 'https://numberrank.dev/mcp'
{
"mcpServers": {
"dev-numberrank-numberrank": {
"type": "http",
"url": "https://numberrank.dev/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 19 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Sept 26 +1
- Stability: unverified → 0.03 ▲ functional
- 16 Sept 26 73
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 20 Sept 2026 · Probed https://numberrank.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=numberrank.dev | CN=YR2,O=Let's Encrypt,C=US | 16 Sept 2026 | 15 Dec 2026 | RSA 2048 | SHA256-RSA | 515df7d10aaf5f5f5a7230388672d8dd31f |
| SANs: numberrank.dev | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of numberrank.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| numberrank.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| content-security-policy | default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; object-src 'none'; upgrade-insecure-requests |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=(), payment=(), usb=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://numberrank.dev/mcp | Verified | 200 | |
| http (plaintext) | http://numberrank.dev/mcp | HTTPS enforced | 308 | https://numberrank.dev/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
check_number Check a phone number's line type ~92
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.
| Name | Type | Req | Description |
|---|---|---|---|
| number | string | yes | Phone number, for example +15551234567 |
No output schema declared.
No examples provided.
directory List AI agent phone providers by line type ~42
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
What is the numberRank MCP server?
numberRank is an MCP server listed in the public MCP registry as dev.numberrank/numberrank. Is a phone number VoIP or a real carrier line? Line type, score and grade, free, no auth. This page covers its hosted endpoint (https://numberrank.dev/mcp).
Is the numberRank MCP server safe to use?
numberRank scores 75 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the numberRank MCP server expose?
numberRank exposes 2 tools: check_number, directory. Their descriptions and schemas cost roughly 134 tokens of context every time the server is loaded.
Does the numberRank MCP server require authentication?
No. We connected to numberRank without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the numberRank MCP server still maintained?
numberRank is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.