# RDAP API (remote · rdapapi.io)

Normalized JSON for any domain across 1,200+ TLDs, reading WHOIS where no RDAP server exists.

- Trust score: 88/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-21

## Components

- remote · `rdapapi.io`: 88/100 (this document), [markdown](https://verifymcp.io/servers/io-rdapapi-rdap/mcp-rdap.md), [page](https://verifymcp.io/servers/io-rdapapi-rdap/mcp-rdap)

## Channel facts

- Endpoint: `https://rdapapi.io/mcp/rdap`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.2.0`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-21.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, but the challenge carries no valid RFC 9728 metadata, so a client cannot discover where to get a token.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1291 tokens (~184/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the RDAP API MCP server?

RDAP API is a hosted endpoint at https://rdapapi.io/mcp/rdap, 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.

### Claude

```bash
claude mcp add --transport http io-rdapapi-rdap 'https://rdapapi.io/mcp/rdap'
```

### Cursor

```json
{
  "mcpServers": {
    "io-rdapapi-rdap": {
      "url": "https://rdapapi.io/mcp/rdap"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-rdapapi-rdap": {
      "type": "http",
      "url": "https://rdapapi.io/mcp/rdap"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-rdapapi-rdap]
url = "https://rdapapi.io/mcp/rdap"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-rdapapi-rdap": {
      "type": "remote",
      "url": "https://rdapapi.io/mcp/rdap",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-rdapapi-rdap --url 'https://rdapapi.io/mcp/rdap' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-rdapapi-rdap:
    url: "https://rdapapi.io/mcp/rdap"
```

### Netclaw

```json
{
  "McpServers": {
    "io-rdapapi-rdap": {
      "Transport": "http",
      "Url": "https://rdapapi.io/mcp/rdap"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-rdapapi-rdap -t streamable-http -u 'https://rdapapi.io/mcp/rdap'
```

### Other

```json
{
  "mcpServers": {
    "io-rdapapi-rdap": {
      "type": "http",
      "url": "https://rdapapi.io/mcp/rdap"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-21 (score 88, 0)

- [security] Stability: 0.97 → pass

### 2026-09-20 (score 88, +1)

No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 87, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 85, +1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “ip-lookup” rewrote its description, which is the text the model reads

### 2026-09-11 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-08 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-06 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (7)

### `domain-lookup` (~135 tokens)

Domain Lookup Tool

Look up normalized RDAP registration data (registrar, status, dates, nameservers, contacts) for a domain name.

Input parameters:

- `domain` (string, required): The domain name to look up, e.g. "example.com". Unicode (IDN) names are accepted.
- `follow` (boolean): Follow the registrar RDAP link for richer data on thin registries such as .com and .net. Slower; defaults to false.
- `whois` (boolean): Set false to refuse the WHOIS fallback, so a TLD with no RDAP server errors instead of answering over port 43. Defaults to true.

### `bulk-domain-lookup` (~158 tokens)

Bulk Domain Lookup Tool

Look up normalized RDAP registration data for several domain names in one pooled call. Requires a Pro or Business plan; every domain in the batch counts against the quota.

Input parameters:

- `domains` (array, required): The domain names to look up, e.g. ["example.com", "example.net"]. Between 1 and 10 per call. Unicode (IDN) names are accepted.
- `follow` (boolean): Follow the registrar RDAP link for richer data on thin registries such as .com and .net. Slower; defaults to false.
- `whois` (boolean): Set false to refuse the WHOIS fallback for every domain in the batch, so a TLD with no RDAP server returns not_supported. Defaults to true.

### `ip-lookup` (~115 tokens)

Ip Lookup Tool

Look up normalized RDAP allocation data (network range, holder, country, status, geofeed URL) for an IP address or CIDR block.

Input parameters:

- `ip` (string, required): IPv4 or IPv6 address, e.g. "8.8.8.8" or "2001:4860:4860::8888".
- `prefix` (integer): Optional CIDR prefix length, e.g. 24. Must be 0-32 for IPv4 or 0-128 for IPv6.

### `asn-lookup` (~56 tokens)

Asn Lookup Tool

Look up normalized RDAP data (holder, country, status, registration dates) for an autonomous system number.

Input parameters:

- `asn` (string, required): Autonomous system number, e.g. "15169" or "AS15169".

### `nameserver-lookup` (~50 tokens)

Nameserver Lookup Tool

Look up normalized RDAP data (IP addresses, status, sponsoring registrar) for a nameserver hostname.

Input parameters:

- `host` (string, required): Nameserver hostname, e.g. "ns1.example.com".

### `entity-lookup` (~111 tokens)

Entity Lookup Tool

Look up normalized RDAP data for an RIR entity handle — an organization or contact identifier such as "GOGL" or "ORG-RIEN1-RIPE". Only ARIN, RIPE, APNIC, LACNIC and AFRINIC handles resolve; a domain's registrar or registrant comes from domain-lookup instead.

Input parameters:

- `handle` (string, required): RIR entity handle, e.g. "GOGL" (ARIN) or "ORG-RIEN1-RIPE" (RIPE).

### `tlds` (~178 tokens)

Tlds Tool

List the TLDs this API can query, or describe one: which RDAP server answers for it, since when it has been supported, and how often that server fills each field. Metadata, so it never counts against the monthly quota.

Input parameters:

- `server` (string): List only the TLDs served by this host, RDAP or WHOIS, e.g. "rdap.verisign.com". Ignored when "tld" is given.
- `since` (string): List only the TLDs added after this ISO 8601 date, e.g. "2026-01-01". Ignored when "tld" is given.
- `tld` (string): A single TLD to describe, e.g. "com" or ".io". Omit to list every supported TLD by name.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-rdapapi-rdap/mcp-rdap#diagnostics

## Score history

- 2026-09-21: 88
- 2026-09-20: 88
- 2026-09-19: 87
- 2026-09-18: 87
- 2026-09-17: 87
- 2026-09-16: 86
- 2026-09-15: 86
- 2026-09-14: 85
- 2026-09-13: 85
- 2026-09-12: 84
- 2026-09-11: 84
- 2026-09-10: 83
- 2026-09-09: 83
- 2026-09-08: 83
- 2026-09-07: 82
- 2026-09-06: 82
- 2026-09-05: 81
- 2026-09-04: 81
- 2026-09-03: 80
- 2026-09-02: 80
- 2026-09-01: 80
- 2026-08-31: 79
- 2026-08-30: 79
- 2026-08-29: 78
- 2026-08-28: 78
- 2026-08-27: 77
- 2026-08-26: 77
- 2026-08-25: 75
- 2026-08-24: 74
- 2026-08-23: 74

## Common questions

### What is the RDAP API MCP server?

RDAP API is an MCP server listed in the public MCP registry as io.rdapapi/rdap. Normalized JSON for any domain across 1,200+ TLDs, reading WHOIS where no RDAP server exists. This page covers its hosted endpoint (https://rdapapi.io/mcp/rdap).

### Is the RDAP API MCP server safe to use?

RDAP API scores 88 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 RDAP API MCP server expose?

RDAP API exposes 7 tools: domain-lookup, bulk-domain-lookup, ip-lookup, asn-lookup, nameserver-lookup, and 2 more. Their descriptions and schemas cost roughly 803 tokens of context every time the server is loaded.

### Does the RDAP API MCP server require authentication?

Yes. RDAP API asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the RDAP API MCP server still maintained?

RDAP API is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://rdapapi.io/mcp/rdap
- Authorisation metadata: https://rdapapi.io/.well-known/oauth-protected-resource/mcp/rdap
- Website: https://rdapapi.io/mcp
- Changelog RSS feed: https://verifymcp.io/servers/io-rdapapi-rdap/mcp-rdap.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-rdapapi-rdap/mcp-rdap.json
- HTML version of this page: https://verifymcp.io/servers/io-rdapapi-rdap/mcp-rdap