# Robtex, free: Domain WHOIS API

> Queries the authoritative RDAP registry for a domain. Returns availability status (HTTP 404 = available), and for registered domains: registrar name, registration/expiration dates, nameservers, DNSSEC status, and domain status flags.

Robtex's domain WHOIS API on its Free API plan. It costs $0.00 per 1,000 domains. Robtex's docs list 6 of the 9 fields on our checklist: Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
Robtex limits how many calls you get but gives no number.
In [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt), this plan scores 83.6 out of 100. Robtex ranks first of 13 providers.
Half of the 316 plans we rank by price cost $1.495 per 1,000 domains or less. This plan and 6 others tie for the lowest price per 1,000 domains of the 316 plans. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[Robtex](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt), [DomScan](https://datacircle.dev/domain-whois-apis/domscan/6-monthly-starter-post-v1-whois-bulk/llms.txt) and [WhoisFreaks](https://datacircle.dev/domain-whois-apis/whoisfreaks/200-monthly-monthly-subscription-150000-api-credits-post-v2-0-bulkwhois-live/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/robtex/free
- [Domain WHOIS API: the 13 best providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://robtex.com/en/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://freeapi.robtex.com/domain_rdap`
- API key: not needed
- Its API docs: https://robtex.com/en/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: Robtex (https://robtex.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 67%
- Registrar: ✓
- Created on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓

## Score

- Overall score: 83.6
- Price score: 100
- Accuracy score: 72
- Cost to get started score: 100
- Bundle score: 98
- Performance score: 33

## Price

- $ per 1,000 domains: $0.00
- Per: call
- Billing: free

## Charges

- Also pays for: 58 other calls

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Queries the authoritative RDAP registry for a domain. Returns availability status (HTTP 404 = available), and for registered domains: registrar name, registration/expiration dates, nameservers, DNSSEC status, and domain status flags.

## Data

- Freshness: live
- Keep data: no limit
- Use data: You agree to use this service only for lawful purposes. You must not: Use the service in any way that violates applicable laws or regulations. Attempt to gain unauthorized access to our systems or networks. Use automated tools to excessively query our service (rate limiting applies). Interfere with or disrupt the service or servers.

## Plan

- Pay: $0

## Rate limit

- Per second: 0.0028
- Batch: 1

## Speed

- Answer: in the call
- Median: 0.30 s

## The call

- You send: domain
- Method: GET
- Path: /domain_rdap

## About the plan

- Plan: Free API
- Who can get it: anyone

## The 9 fields the plan's answer can hold

status, domain name, availability, TLD, registrar name, registration date, expiration date, name servers, DNSSEC

## Robtex's plans (1)

- [Robtex, free](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt): $0.00 per 1,000, 67% complete, live

## Robtex's calls (1)

- `GET /domain_rdap`: [Robtex, free](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt)

## Robtex's APIs (1)

- [Robtex: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt)

## Robtex: domain WHOIS API alternatives

- [WhoisFreaks, free, POST /v2.0/bulkwhois/live](https://datacircle.dev/domain-whois-apis/whoisfreaks/free-post-v2-0-bulkwhois-live/llms.txt): $0.00 per 1,000, 100% complete, live
- [fetcher.cloud, free](https://datacircle.dev/domain-whois-apis/fetcher-cloud/free/llms.txt): $0.00 per 1,000, 44% complete, live
- [ViewDNS.info, free](https://datacircle.dev/domain-whois-apis/viewdns-info/free/llms.txt): $0.00 per 1,000, 89% complete, live
- [Whoxy, free, Education](https://datacircle.dev/domain-whois-apis/whoxy/free-education/llms.txt): $0.00 per 1,000, 78% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-07.

- https://freeapi.robtex.com/api-docs.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://robtex.com/en/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://robtex.com/en/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing