# IPAddress.to, free: Domain WHOIS API

> Registration data for a domain or IP address, assembled from the authoritative registries and registrars.

IPAddress.to's Free plan for the domain WHOIS API costs $0.00 per 1,000 domains. IPAddress.to's docs list 8 of the 9 fields on our checklist: Registrar, Created on, Updated on, Expires on, Name servers, Statuses, DNSSEC, Abuse contact.
You get as many calls as you like.
We haven't run IPAddress.to through [our domain WHOIS API benchmark](https://datacircle.dev/best-domain-whois-api.txt) yet.
Half of the 349 plans we rank by price cost $1.495 per 1,000 domains or less. This plan and 10 others tie for the lowest price per 1,000 domains of the 349 plans. [See the best free domain WHOIS API plan.](https://datacircle.dev/best-domain-whois-api.txt)
[Enterno](https://datacircle.dev/domain-whois-apis/enterno/free-open-api/llms.txt), [Robtex](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt) and [DomScan](https://datacircle.dev/domain-whois-apis/domscan/49-monthly-scale-post-v1-whois-bulk/llms.txt) are the best domain WHOIS API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/domain-whois-apis/ipaddress-to/free
- [Domain WHOIS API: the 18 best providers compared](https://datacircle.dev/best-domain-whois-api.txt)
- Get it: https://ipaddress.to/api/docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- Request: `GET https://ipaddress.to/api/whois/{ip_or_domain}`
- API key: not needed
- Its API docs: https://ipaddress.to/api/docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing#whois
- Sold by: IPAddress.to (https://ipaddress.to?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 89%
- Registrar: ✓
- Created on: ✓
- Updated on: ✓
- Expires on: ✓
- Name servers: ✓
- Statuses: ✓
- DNSSEC: ✓
- Abuse contact: ✓

## 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: Registration data for a domain or IP address, assembled from the authoritative registries and registrars.

## Data

- Freshness: live
- Keep data: no limit
- Use data: You agree not to: Use the Service for any unlawful purpose or in violation of any applicable laws, Attempt to disrupt, overload, or impair the Service's infrastructure, Use automated tools to excessively scrape or crawl the Service beyond reasonable API usage, Circumvent any rate limits or access restrictions, Use the Service to harass, stalk, or harm other individuals, Misrepresent your identity or affiliation when using the Service. [...] The API is provided free of charge for reasonable use. We reserve the right to impose rate limits, restrict access, or require authentication at any time. [...] Information is provided "as is" for informational purposes only. [...] You may not copy, reproduce, or redistribute any part of the Service without prior written consent.

## Plan

- Pay: $0
- Enough for: no limit

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: ip_or_domain
- Method: GET
- Path: /whois/{ip_or_domain}

## About the plan

- Plan: Free
- Who can get it: anyone

## The 25 fields the plan's answer can hold

query, query type, found, domain, registrar, registrar URL, registrar IANA ID, created date, expires date, updated date, status, name servers, DNSSEC, abuse email, abuse phone, raw record, for sale RFC, for sale listed, for sale checked, for sale node, for sale text, for sale URIs, for sale prices, for sale codes, source

## IPAddress.to's plans (1)

- [IPAddress.to, free](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt): $0.00 per 1,000, 89% complete, live

## IPAddress.to's calls for this API (1)

- `GET /whois/{ip_or_domain}`: [IPAddress.to, free](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt)

## IPAddress.to's APIs (3)

- [IPAddress.to: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/ipaddress-to/free/llms.txt)
- [IPAddress.to: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/ipaddress-to/free/llms.txt)
- [IPAddress.to: IP company lookup API pricing, 1 plan, GET /score/{ip_or_hostname}](https://datacircle.dev/ip-company-lookup-apis/ipaddress-to/free-get-score-ip-or-hostname/llms.txt)
- [IPAddress.to: IP company lookup API pricing, 1 plan, GET /lookup/{ip_or_hostname}](https://datacircle.dev/ip-company-lookup-apis/ipaddress-to/free-get-lookup-ip-or-hostname/llms.txt)

## IPAddress.to: domain WHOIS API alternatives

- [Enterno, free, Scout](https://datacircle.dev/domain-whois-apis/enterno/free-scout/llms.txt): $0.00 per 1,000, 89% complete, live
- [Robtex, free](https://datacircle.dev/domain-whois-apis/robtex/free/llms.txt): $0.00 per 1,000, 67% complete, live
- [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
- [How.is, free](https://datacircle.dev/domain-whois-apis/how-is/free/llms.txt): $0.00 per 1,000, 56% 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://ipaddress.to?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ipaddress.to/api/docs/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing
- https://ipaddress.to/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=domain-whois-api-pricing