# isMalicious, free: Domain WHOIS API

> Get WHOIS registration data including registrant, registrar, and dates.

isMalicious's Free plan for the domain WHOIS API costs $0.00 per 1,000 domains. We check each provider's docs for 9 fields. isMalicious's docs list 6: Registrant, Registrar, Created on, Updated on, Expires on, Name servers.
We haven't run isMalicious through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
This plan is free. We rank 495 plans for domain WHOIS APIs by price. Half the plans cost $1.575 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.
[WhoisJSON](https://datacircle.dev/domain-whois-apis/whoisjson/120-monthly/llms.txt), [Enterno](https://datacircle.dev/domain-whois-apis/enterno/free-open-api/llms.txt) and [IPAddress.to](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/ismalicious/free
- [Domain WHOIS API in 2026: the best of 20+ providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://ismalicious.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://api.ismalicious.com/check/whois`
- API key: with the plan, on https://ismalicious.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Its API docs: https://ismalicious.com/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#check-whois
- Sold by: isMalicious (https://ismalicious.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 67%
- Registrant: ✓
- Registrar: ✓
- Created on: ✓
- Updated on: ✓
- Expires on: ✓
- Name servers: ✓

## Price

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

## Charges

- Also pays for: Scan one email message · POST /gate/scan · GET /gate/url?u= · from the same budget: Full Threat Analysis · Check Reputation · Check Geolocation · Check Certificates · Check Vulnerabilities · Microsoft 365 tenant · Bulk entity check · Report stream (SSE) · CVE lookup, search and recent list · CVE by id (path form) · Recent CVEs (bare array) · Resolve an external identifier to its CVEs · CVEs exploited in the last N days · Indicators tagged with a CVE · Recent ransomware victims · Ransomware statistics · Ransomware group profile · Ransomware groups · Ransomware press · Sector risk · Sector risk history · Sector victims

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Get WHOIS registration data including registrant, registrar, and dates.

## Data

- Freshness: stored
- Keep data: no limit
- Use data: a limited, non-exclusive, non-transferable, non-sublicensable, revocable license during your Subscription or other authorized use to access and use the Services solely for your internal security, fraud prevention, risk management, and related lawful business purposes. You will not, and will not assist others to: (a) reverse engineer, decompile, or attempt to extract source code or models from the Services except where mandatory law allows, (b) probe, scan, or test the vulnerability of our systems without prior written consent, (c) use the Services to build or train a competing reputation or threat database for commercial redistribution, except to the extent Outputs are used only as integrated into your own security operations, (d) remove or obscure proprietary notices, or (e) resell, lease, or time-share access to the Services unless we expressly permit that in writing (for example, under an enterprise agreement). [...] you may not publicly republish our bulk data products or APIs as a substitute for your own customers' direct relationship with us where doing so would effectively redistribute our commercial offering, unless we expressly allow it in writing.

## Plan

- Pay: €0
- You get: 250 requests a month
- Enough for: 250 calls a month
- Expires: at the monthly reset, the 1st at 00:00 UTC

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: query
- Method: GET
- Path: /check/whois

## About the plan

- Plan: Free
- Who can get it: anyone with an email address, at least thirteen years old and of the age of digital consent in their jurisdiction, no card

## The 6 fields the plan's answer can hold

registrar, registrant, created date, updated date, expiry date, name servers

## isMalicious's plans (5)

- [isMalicious, free](https://datacircle.dev/domain-whois-apis/ismalicious/free/llms.txt): $0.00 per 1,000, 67% complete, stored
- [isMalicious, €49 monthly](https://datacircle.dev/domain-whois-apis/ismalicious/49-monthly/llms.txt): $27.57 per 1,000, 67% complete, stored
- [isMalicious, €99 monthly](https://datacircle.dev/domain-whois-apis/ismalicious/99-monthly/llms.txt): $11.140 per 1,000, 67% complete, stored
- [isMalicious, €990 yearly](https://datacircle.dev/domain-whois-apis/ismalicious/990-yearly/llms.txt): $9.284 per 1,000, 67% complete, stored
- [isMalicious, contact us](https://datacircle.dev/domain-whois-apis/ismalicious/contact-us/llms.txt): 67% complete, stored

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

- `GET /check/whois`: [isMalicious, free](https://datacircle.dev/domain-whois-apis/ismalicious/free/llms.txt)

## isMalicious's APIs (2)

- [isMalicious: domain WHOIS API pricing, 5 plans](https://datacircle.dev/domain-whois-apis/ismalicious/free/llms.txt)
- [isMalicious: IP company lookup API pricing, 5 plans](https://datacircle.dev/ip-company-lookup-apis/ismalicious/free/llms.txt)

## isMalicious: domain WHOIS API alternatives

- [DNSai, $499 monthly, Enterprise, GET /api/v1/domains/{id}/whois/](https://datacircle.dev/domain-whois-apis/dnsai/499-monthly-enterprise-get-api-v1-domains-id-whois/llms.txt): $1.663 per 1,000, 89% complete, stored
- [Agent Data Tools, $20 pack](https://datacircle.dev/domain-whois-apis/agent-data-tools/20-pack/llms.txt): $9.091 per 1,000, 56% complete, live
- [ViewDNS.info, $1,639 yearly](https://datacircle.dev/domain-whois-apis/viewdns-info/1639-yearly/llms.txt): $9.106 per 1,000, 89% complete, live
- [Whoxy, $470 pack](https://datacircle.dev/domain-whois-apis/whoxy/470-pack/llms.txt): $9.40 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 2026-11-09.

- https://ismalicious.com/api-docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ismalicious.com/api-docs/lookup?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ismalicious.com/api-docs/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ismalicious.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ismalicious.com/playbooks/lightweight-reputation-checks?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ismalicious.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ismalicious.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing