RDAP API

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io.rdapapi/rdapv1.3.0 Domain verified

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

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https://rdapapi.io/mcp/rdap

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Bearer <your rdapapi.io API key>, created on your dashboard. Optional for clients that sign in with OAuth instead. Connecting and listing the tools works without it; every lookup requires a key or an OAuth sign-in.

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asn-lookup Read-only

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

asnstring, required

Autonomous system number, e.g. "15169" or "AS15169".

Tools (7)

asn-lookup

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

read-only

Argument	Type	Description
asn*	string	Autonomous system number, e.g. "15169" or "AS15169".

Input schema (JSON)

{
  "type": "object",
  "required": [
    "asn"
  ],
  "properties": {
    "asn": {
      "type": "string",
      "description": "Autonomous system number, e.g. \"15169\" or \"AS15169\"."
    }
  }
}

bulk-domain-lookup

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.

read-only

Argument	Type	Description
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.
follow	boolean	Follow the registrar RDAP link for richer data on thin registries such as .com and .net. Slower; defaults to false.
domains*	array	The domain names to look up, e.g. ["example.com", "example.net"]. Between 1 and 10 per call. Unicode (IDN) names are accepted. Pass registered domains, not hosts such as "www.example.com".

Input schema (JSON)

{
  "type": "object",
  "required": [
    "domains"
  ],
  "properties": {
    "whois": {
      "type": "boolean",
      "default": true,
      "description": "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."
    },
    "follow": {
      "type": "boolean",
      "default": false,
      "description": "Follow the registrar RDAP link for richer data on thin registries such as .com and .net. Slower; defaults to false."
    },
    "domains": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 10,
      "minItems": 1,
      "description": "The domain names to look up, e.g. [\"example.com\", \"example.net\"]. Between 1 and 10 per call. Unicode (IDN) names are accepted. Pass registered domains, not hosts such as \"www.example.com\"."
    }
  }
}

domain-lookup

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

read-only

Argument	Type	Description
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.
domain*	string	The domain name to look up, e.g. "example.com". Unicode (IDN) names are accepted. Pass the registered domain, not a host such as "www.example.com".
follow	boolean	Follow the registrar RDAP link for richer data on thin registries such as .com and .net. Slower; defaults to false.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "whois": {
      "type": "boolean",
      "default": true,
      "description": "Set false to refuse the WHOIS fallback, so a TLD with no RDAP server errors instead of answering over port 43. Defaults to true."
    },
    "domain": {
      "type": "string",
      "description": "The domain name to look up, e.g. \"example.com\". Unicode (IDN) names are accepted. Pass the registered domain, not a host such as \"www.example.com\"."
    },
    "follow": {
      "type": "boolean",
      "default": false,
      "description": "Follow the registrar RDAP link for richer data on thin registries such as .com and .net. Slower; defaults to false."
    }
  }
}

entity-lookup

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.

read-only

Argument	Type	Description
handle*	string	RIR entity handle, e.g. "GOGL" (ARIN) or "ORG-RIEN1-RIPE" (RIPE).

Input schema (JSON)

{
  "type": "object",
  "required": [
    "handle"
  ],
  "properties": {
    "handle": {
      "type": "string",
      "description": "RIR entity handle, e.g. \"GOGL\" (ARIN) or \"ORG-RIEN1-RIPE\" (RIPE)."
    }
  }
}

ip-lookup

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

read-only

Argument	Type	Description
ip*	string	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.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "ip"
  ],
  "properties": {
    "ip": {
      "type": "string",
      "description": "IPv4 or IPv6 address, e.g. \"8.8.8.8\" or \"2001:4860:4860::8888\"."
    },
    "prefix": {
      "type": "integer",
      "description": "Optional CIDR prefix length, e.g. 24. Must be 0-32 for IPv4 or 0-128 for IPv6."
    }
  }
}

nameserver-lookup

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

read-only

Argument	Type	Description
host*	string	Nameserver hostname, e.g. "ns1.example.com".

Input schema (JSON)

{
  "type": "object",
  "required": [
    "host"
  ],
  "properties": {
    "host": {
      "type": "string",
      "description": "Nameserver hostname, e.g. \"ns1.example.com\"."
    }
  }
}

tlds

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.

read-only

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

Input schema (JSON)

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