# RDAP API (rdapapi.io)

Returns domain registration, registrar and nameserver data as uniform JSON, including for TLDs that lack their own RDAP servers.

- Atlas card: https://inite.ai/en/atlas/rdapapi.io
- Site: https://rdapapi.io
- For: Developers replacing whois lookups with clean JSON RDAP data in their code
- Use 0/100 · alive 100/100

## Used for

- look up registration dates and nameservers for domains
- pull registrar contact data for a domain
- add registration fields to a domain dataset in bulk

## Price

- from 9 USD/month, no free plan (read 2026-10-21 on https://rdapapi.io/pricing)

## For developers

- API docs: https://rdapapi.io/docs
- MCP server: io.rdapapi/rdap (namespace; open on 2026-10-21, 7 tools)
- Status page: https://status.rdapapi.io
- Read 2026-10-21

## MCP server, measured daily

Server: https://rdapapi.io/mcp/rdap, checked every day since 2026-10-21 (14 checks).

- Answered: 100% of daily checks
- Median first answer: 451 ms
- Sign-in: none
- Context its tool definitions take: about 1007 tokens (7 tools)
- Tool definitions: A, 100/100
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: gdpr
- Read 2026-10-21

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Source: INITE Atlas, https://inite.ai/en/atlas/rdapapi.io. JSON: https://inite.ai/api/atlas/rdapapi.io. MCP: https://inite.ai/api/mcp (atlas_lookup).