RDAP API Python SDK

Official Python SDK for the RDAP API — look up domains, IP addresses, ASNs, nameservers, and entities via the RDAP protocol.

Installation

pip install rdapapi

Quick start

from rdapapi import RdapApi

api = RdapApi("your-api-key")

# Domain lookup
domain = api.domain("google.com")
print(domain.registrar.name)     # "MarkMonitor Inc."
print(domain.dates.expires)      # "2028-09-14T04:00:00Z"
print(domain.nameservers)        # ["ns1.google.com", ...]

# IP address lookup
ip = api.ip("8.8.8.8")
print(ip.name)                   # "GOGL"
print(ip.cidr)                   # ["8.8.8.0/24"]

# ASN lookup
asn = api.asn(15169)
print(asn.name)                  # "GOOGLE"

# Nameserver lookup
ns = api.nameserver("ns1.google.com")
print(ns.ip_addresses.v4)       # ["216.239.32.10"]

# Entity lookup
entity = api.entity("GOGL")
print(entity.name)               # "Google LLC"
print(entity.autnums[0].handle) # "AS15169"

api.close()

Bulk domain lookups

Look up multiple domains in a single request (Pro and Business plans). Up to 10 domains per call, with concurrent upstream fetches:

result = api.bulk_domains(["google.com", "github.com", "invalid..com"], follow=True)

print(result.summary)  # total=3, successful=2, failed=1

for r in result.results:
    if r.status == "success":
        print(f"{r.data.domain}: {r.data.registrar.name}")
    else:
        print(f"{r.domain}: {r.error}")

Each domain counts as one request toward your monthly quota. Starter plans receive a SubscriptionRequiredError (403).

Registrar follow-through

For thin registries like .com and .net, the registry only returns basic registrar info. Use follow=True to follow the registrar's RDAP link and get richer contact data:

domain = api.domain("google.com", follow=True)
print(domain.entities.registrant.organization)  # "Google LLC"
print(domain.entities.registrant.email)         # "registrant@google.com"

Error handling

from rdapapi import RdapApi, NotFoundError, NotSupportedError, RateLimitError, AuthenticationError

api = RdapApi("your-api-key")

try:
    domain = api.domain("example.nope")
except NotSupportedError:
    print("The TLD is not covered by RDAP.")
except NotFoundError:
    print("The domain is not registered.")
except RateLimitError as e:
    print(f"Rate limited. Retry after {e.retry_after}s")
except AuthenticationError:
    print("Invalid API key")

NotSupportedError is a subclass of NotFoundError, so catching NotFoundError still handles both cases. All exceptions inherit from RdapApiError and include status_code, error, and message attributes.

Exception	HTTP Status	When
ValidationError	400	Invalid input format
AuthenticationError	401	Missing or invalid API key
SubscriptionRequiredError	403	No active subscription
NotFoundError	404	Namespace is covered but no record exists
NotSupportedError	404	Namespace (TLD, IP range, ASN range) is not covered by RDAP
RateLimitError	429	Rate limit or quota exceeded
UpstreamError	502	Upstream RDAP server error
TemporarilyUnavailableError	503	Domain data temporarily unavailable

Supported TLDs catalog

List every TLD the API can resolve, with the date support was added and a qualitative summary of which fields the registry's RDAP server populates. Does not count against your monthly quota.

tlds = api.tlds()
print(f"{tlds.meta.count} TLDs, coverage {tlds.meta.coverage:.0%}")

for tld in tlds.data:
    availability = tld.field_availability
    if availability is not None:
        print(f"{tld.tld}: expires_at={availability.expires_at}")

Filter to recent additions or to a single registry:

recent = api.tlds(since="2026-04-01T00:00:00Z")
verisign = api.tlds(server="rdap.verisign.com")

Pass back the previous etag to skip the transfer when nothing has changed:

first = api.tlds()
later = api.tlds(if_none_match=first.etag)
if later is None:
    print("No change since last poll")

Look up a single TLD:

com = api.tld("com")
print(com.data.rdap_server_host)  # "rdap.verisign.com"

Async support

import asyncio
from rdapapi import AsyncRdapApi

async def main():
    async with AsyncRdapApi("your-api-key") as api:
        domain, ip, asn = await asyncio.gather(
            api.domain("google.com"),
            api.ip("8.8.8.8"),
            api.asn(15169),
        )
        print(f"{domain.domain}: {domain.registrar.name}")

asyncio.run(main())

Serialization

All response objects are Pydantic models with full type hints:

domain = api.domain("google.com")

# Convert to dict
data = domain.model_dump()

# Convert to JSON string
json_str = domain.model_dump_json()

Configuration

api = RdapApi(
    "your-api-key",
    base_url="https://rdapapi.io/api/v1",  # default
    timeout=30,                              # seconds, default
)

Links

• API Documentation
• Get an API Key
• OpenAPI Spec
• Pricing

Development

Set up pre-commit hooks (runs lint + tests before each commit):

git config core.hooksPath .githooks

License

MIT