# C99.nl, $5 monthly: Domain WHOIS API

> Retrieves WHOIS registration data for a given domain name.

C99.nl's domain WHOIS API on its Monthly plan. It costs $0.033 per 1,000 domains. C99.nl's docs list none of the 9 fields on our checklist: Registrant, Registrar, Created on, Updated on and 5 more.
We ran C99.nl in [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt). We didn't score any C99.nl plan.
Half of the 316 plans we rank by price cost $1.495 per 1,000 domains or less. This plan costs less per 1,000 domains than 95% of the 316 plans.
[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.
[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/c99-nl/5-monthly
- [Domain WHOIS API: the 13 best providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://api.c99.nl/shop?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://api.c99.nl/whois`
- API key: with the plan, on https://api.c99.nl/shop?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Its API docs: https://api.c99.nl/documentation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#/Domain%20&%20IP%20Tools/get_whois
- Sold by: C99.nl (https://api.c99.nl?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 0%

## Price

- $ per 1,000 domains: $0.033
- Per: call
- Billing: monthly
- $ a month: $5

## Charges

- Also pays for: from the same budget: Subdomain Finder · IP Reputation/Malicious IP Checker · Phone Number Lookup · Firewall Detector · Get Hostname · DNS Checker · Gets the IP behind a host · IP to Domains · GeoIP Lookup · Up or Down Checker · URL Reputation Checker · Get HTTP Headers · Link Backup (Archive.org) · Dictionary Lookup · Email Validator · Disposable Email Checker · IP Address Validator · Tor Exit Node Checker · Translate Text · Random Person Generator · YouTube Video Details · View IP Loggers · View IP Logger Logs · Bitcoin Address Balance · Currency Converter · Currency Rates · Currencies · Weather Information · QR Code Generator · Password Generator · License Key Generator · Random Number Generator · Search GIFs

## In their words

- Their pitch: Retrieves WHOIS registration data for a given domain name.

## Data

- Keep data: no limit
- Use data: "We grant you a limited, non-exclusive, non-transferable, and revocable license to use the C99.nl API for its intended purposes, subject to your compliance with these Terms of Service." [...] "You agree not to engage in any of the following activities: Sharing API Keys: Do not share your API key with others. Your API key is unique to your account and is intended for your use only. Abuse of the API: Do not abuse the API in ways that could disrupt the service for other users. This includes, but is not limited to, excessive requests, spamming, or any activity that places an unreasonable load on our infrastructure. Competitive Use: Do not use the API to create or support any service that directly competes with C99.nl or its offerings. Interception of Connections: Do not use the API key in software or environments where outgoing connections can be intercepted. Illegal Activities: Do not use the API for any illegal, fraudulent, or malicious purposes. Reverse Engineering: Do not attempt to reverse engineer, decompile, or disassemble the API or any part of the Service. Bypassing Restrictions: Do not attempt to bypass any rate limits, security measures, or access controls implemented by C99.nl." [...] "Compliance: You agree to comply with all applicable laws, regulations, and third-party agreements in your use of the API."

## Plan

- Pay: $5
- You get: 150,000 requests a month
- Enough for: 150,000 calls a month

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

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

## About the plan

- Plan: Monthly
- Who can get it: anyone

## The 2 fields the plan's answer can hold

raw WHOIS record, split WHOIS record

## C99.nl's plans (3)

- [C99.nl, $5 monthly](https://datacircle.dev/domain-whois-apis/c99-nl/5-monthly/llms.txt): $0.033 per 1,000, 0% complete
- [C99.nl, $25 yearly](https://datacircle.dev/domain-whois-apis/c99-nl/25-yearly/llms.txt): $0.014 per 1,000, 0% complete
- [C99.nl, contact us](https://datacircle.dev/domain-whois-apis/c99-nl/contact-us/llms.txt): 0% complete

## C99.nl's calls (1)

- `GET /whois`: [C99.nl, $5 monthly](https://datacircle.dev/domain-whois-apis/c99-nl/5-monthly/llms.txt)

## C99.nl's APIs (1)

- [C99.nl: domain WHOIS API pricing, 3 plans](https://datacircle.dev/domain-whois-apis/c99-nl/5-monthly/llms.txt)

## C99.nl: domain WHOIS API alternatives

- [GuGuData, CNY 49 monthly](https://datacircle.dev/domain-whois-apis/gugudata/cny-49-monthly/llms.txt): $0.00057 per 1,000, 89% complete
- [Sugra API, $588 yearly, Pro (billed annually), GET /api/v1/network/domain/{host}/whois](https://datacircle.dev/domain-whois-apis/sugra-api/588-yearly-pro-billed-annually-get-api-v1-network-domain-host-whois/llms.txt): $0.032 per 1,000, 78% complete
- [Enterno, ₽12,516 yearly](https://datacircle.dev/domain-whois-apis/enterno/12516-yearly/llms.txt): $0.041 per 1,000, 89% complete, live
- [WhoisJSON, $500 yearly](https://datacircle.dev/domain-whois-apis/whoisjson/500-yearly/llms.txt): $0.042 per 1,000, 89% complete, 3 hours

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-04.

- https://api.c99.nl?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.c99.nl/documentation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.c99.nl/documentation?spec=json&utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.c99.nl/faq?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.c99.nl/shop?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://api.c99.nl/tos?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing