# FernTool, free: Domain WHOIS API

> RDAP WHOIS for a domain, IP or ASN

FernTool's Free plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. FernTool's docs list all 9: Registrant, Registrar, Created on, Updated on, Expires on, Name servers, Statuses, DNSSEC, Abuse contact.
FernTool 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 83.1 out of 100. FernTool ranks 10th of 38 providers.
We rank 589 plans for domain WHOIS APIs by price. Half the plans cost $1.67 or less per 1,000 domains. This plan and 29 others tie for the lowest price per 1,000 domains of the 589 plans. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[thenetworkery](https://datacircle.dev/domain-whois-apis/thenetworkery/free/llms.txt), [FluentEDI](https://datacircle.dev/domain-whois-apis/fluentedi/free/llms.txt) and [DomainDetails](https://datacircle.dev/domain-whois-apis/domaindetails/9-99-monthly-alerts-get-api-rdap/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/ferntool/free
- [Domain WHOIS API in 2026: the best of 30+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://www.ferntool.com/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://www.ferntool.com/api/whois/{query}`
- API key: not needed
- Its API docs: https://www.ferntool.com/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Sold by: FernTool (https://www.ferntool.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 100%
- Registrant: ✓
- Registrar: ✓
- Created on: ✓
- Updated on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓
- Abuse contact: ✓

## Score

- Overall score: 83.1
- Price score: 100
- Accuracy score: 87
- Cost to get started score: 100
- Bundle score: 0
- Performance score: 66

## Price

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

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: RDAP WHOIS for a domain, IP or ASN

## Data

- Freshness: live
- Keep data: no limit
- Use data: Do not abuse the API (automated heavy use may be rate limited). Do not use the service for unlawful purposes.

## Plan

- Pay: $0

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call
- Median: 0.15 s

## The call

- You send: query
- Method: GET
- Path: /api/whois/{query}

## About the plan

- Plan: Free
- Who can get it: anyone

## The 15 fields the plan's answer can hold

domain, registered, registry handle, status, registrar, registrar IANA ID, created date, expires date, updated date, last RDAP database update, name servers, DNSSEC, RDAP URL, abuse email, registrant

## FernTool's plans (1)

- [FernTool, free](https://datacircle.dev/domain-whois-apis/ferntool/free/llms.txt): $0.00 per 1,000, 100% complete, live

## FernTool's calls for this API (1)

- `GET /api/whois/{query}`: [FernTool, free](https://datacircle.dev/domain-whois-apis/ferntool/free/llms.txt)

## FernTool's APIs (2)

- [FernTool: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/ferntool/free/llms.txt)
- [FernTool: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/ferntool/free/llms.txt)

## FernTool: domain WHOIS API alternatives

- [thenetworkery, free](https://datacircle.dev/domain-whois-apis/thenetworkery/free/llms.txt): $0.00 per 1,000, 100% complete, live
- [FluentEDI, free](https://datacircle.dev/domain-whois-apis/fluentedi/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [Enterno, free, Scout](https://datacircle.dev/domain-whois-apis/enterno/free-scout/llms.txt): $0.00 per 1,000, 89% complete, live
- [IPAddress.to, free](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt): $0.00 per 1,000, 89% 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 2026-11-10.

- https://www.ferntool.com/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://www.ferntool.com/api/whois/example.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://www.ferntool.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://www.ferntool.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://www.ferntool.com/whois-lookup?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing