# Ambolt, free: Domain WHOIS API

> Look up a domain in the public RDAP registry: registration, last-changed and expiry dates, status codes, nameservers, DNSSEC flag and registrar name. Registrant and contact details are not returned.

Ambolt's Free call a day plan for the domain WHOIS API costs $0.00 per 1,000 domains. Ambolt's docs list 6 of the 9 fields on our checklist: Registrar, Created on, Expires on, Name servers, Statuses, DNSSEC.
You get up to 30 calls a month.
We haven't run Ambolt through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
This plan is free. We rank 363 plans for domain WHOIS APIs by price. Half the plans cost $1.50 or less per 1,000 domains. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[Searchwire's $10 pack](https://datacircle.dev/domain-whois-apis/searchwire/10-pack/llms.txt) is the cheapest paid plan per 1,000 domains. Searchwire's domain WHOIS API costs nothing beyond the plan price. [C99.nl's $25 yearly plan](https://datacircle.dev/domain-whois-apis/c99-nl/25-yearly/llms.txt) costs the least for 10,000 domains a month: $2.08.
[Enterno](https://datacircle.dev/domain-whois-apis/enterno/free-open-api/llms.txt), [IPAddress.to](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt) and [Robtex](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/ambolt/free
- [Domain WHOIS API: the 19 best of 70+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://api.ambolt.dev/v1/domain-rdap`
- API key: not needed
- Its API docs: https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/paths/~1v1~1domain-rdap
- Sold by: Ambolt (https://ambolt.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-08

## In the answer

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

## Price

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

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Look up a domain in the public RDAP registry: registration, last-changed and expiry dates, status codes, nameservers, DNSSEC flag and registrar name. Registrant and contact details are not returned.

## Data

- Keep data: no limit
- Use data: Do not use the services to attack or overload systems, to evade sanctions, or in breach of law. [...] Each developer-tool response names its source and licence. Where a source requires attribution, you must keep it when you reuse the data.

## Plan

- Pay: $0
- Enough for: 30 calls a month

## Rate limit

- Per day: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: domain. Optional: free
- Method: GET
- Path: /v1/domain-rdap

## About the plan

- Plan: Free call a day
- Who can get it: anyone, with no account or API key: one free call per tool and IP address per day

## The 7 fields the plan's answer can hold

registration date, last changed date, expiry date, status codes, nameservers, DNSSEC, registrar name

## Ambolt's plans (2)

- [Ambolt, free](https://datacircle.dev/domain-whois-apis/ambolt/free/llms.txt): $0.00 per 1,000, 67% complete
- [Ambolt, pay as you go](https://datacircle.dev/domain-whois-apis/ambolt/pay-as-you-go/llms.txt): $3.00 per 1,000, 67% complete

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

- `GET /v1/domain-rdap`: [Ambolt, free](https://datacircle.dev/domain-whois-apis/ambolt/free/llms.txt)

## Ambolt's APIs (6)

- [Ambolt: tech stack API pricing, 2 plans](https://datacircle.dev/company-technology-apis/ambolt/free/llms.txt)
- [Ambolt: domain WHOIS API pricing, 2 plans](https://datacircle.dev/domain-whois-apis/ambolt/free/llms.txt)
- [Ambolt: email verification API pricing, 2 plans](https://datacircle.dev/validate-email-apis/ambolt/free/llms.txt)
- [Ambolt: web scraping API pricing, 2 plans](https://datacircle.dev/web-scraping-apis/ambolt/free/llms.txt)
- [Ambolt: company enrichment API pricing, 2 plans, GET /v1/brazil-cnpj-lookup](https://datacircle.dev/company-enrichment-apis/ambolt/free-call-a-day-get-v1-brazil-cnpj-lookup/llms.txt)
- [Ambolt: company enrichment API pricing, 2 plans, GET /v1/eu-vat-validate](https://datacircle.dev/company-enrichment-apis/ambolt/free-call-a-day-get-v1-eu-vat-validate/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/entity-resolve](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-entity-resolve/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/lei-lookup](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-lei-lookup/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/nordic-company-lookup](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-nordic-company-lookup/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/us-business-entities](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-us-business-entities/llms.txt)

## Ambolt: domain WHOIS API alternatives

- [DomScan, $10 pack, 10,000 credits, POST /v1/whois/bulk](https://datacircle.dev/domain-whois-apis/domscan/10-pack-10000-credits-post-v1-whois-bulk/llms.txt): $3.00 per 1,000, 100% complete
- [WhoisFreaks, $150 pack, 50,000 API Credits, POST /v2.0/bulkwhois/live](https://datacircle.dev/domain-whois-apis/whoisfreaks/150-pack-50000-api-credits-post-v2-0-bulkwhois-live/llms.txt): $3.00 per 1,000, 100% complete, live
- [ipv4.fr, pay as you go](https://datacircle.dev/domain-whois-apis/ipv4-fr/pay-as-you-go/llms.txt): $3.00 per 1,000, 44% complete
- [JsonWhois, $15.10 monthly](https://datacircle.dev/domain-whois-apis/jsonwhois/15-10-monthly/llms.txt): $3.02 per 1,000, 78% complete, 1 week

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-08.

- https://ambolt.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ambolt.dev/licences?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ambolt.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ambolt.dev/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ambolt.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.ambolt.dev/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.ambolt.dev/catalog.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing