# fourzerotwo, free key, GET /v1/domains/ip-owner: IP company lookup API

> Network, organisation, range, country and abuse email for an IP, from the regional internet registry.

fourzerotwo's Free key plan for the IP company lookup API costs $0.00 per 1,000 IP addresses. We check each provider's docs for 10 fields. fourzerotwo's docs list 3: Owner's name, Network range, Country.
You get up to 90 calls a month.
We haven't run fourzerotwo through [our IP company lookup API benchmark](https://datacircle.dev/best-ip-company-lookup-api.txt) yet.
This plan is free. We rank 529 plans for IP company lookup APIs by price. Half the plans cost $0.245 or less per 1,000 IP addresses. [See the best free IP company lookup API plan.](https://datacircle.dev/best-ip-company-lookup-api.txt)
[IPHunter's €99.99 monthly plan](https://datacircle.dev/ip-company-lookup-apis/iphunter/99-99-monthly/llms.txt) is the cheapest paid plan per 1,000 IP addresses. IPHunter's €99.99 monthly plan covers up to 11,520,000 IP addresses a day. [ipapi.is' top-up plan](https://datacircle.dev/ip-company-lookup-apis/ipapi-is/top-up-from-1-one-time-credits-post/llms.txt) costs the least for 10,000 IP addresses a month: $1.00.
[Api.co.id's Rp99,000 (about $5) monthly plan](https://datacircle.dev/ip-company-lookup-apis/api-co-id/rp99000-monthly/llms.txt) covers any number of IP addresses. Api.co.id's Rp99,000 (about $5) monthly plan costs less up front than IPHunter's €99.99 monthly plan.
[IPKit](https://datacircle.dev/ip-company-lookup-apis/ipkit/free/llms.txt), [thenetworkery](https://datacircle.dev/ip-company-lookup-apis/thenetworkery/free/llms.txt) and [DC5 WHOIS](https://datacircle.dev/ip-company-lookup-apis/dc5-whois/free-public-instance-get-api-v1-lookup/llms.txt) are the best IP company lookup API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-domains-ip-owner
- [IP company lookup API in 2026: the best of 60+ compared](https://datacircle.dev/best-ip-company-lookup-api.txt)
- Get it: https://fourzerotwo.si/free?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Request: `GET https://fourzerotwo.si/v1/domains/ip-owner`
- API key: with the plan, on https://fourzerotwo.si/free?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Its API docs: https://fourzerotwo.si/apis/domains/ip-owner?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Sold by: fourzerotwo (https://fourzerotwo.si?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 30%
- Owner's name: ✓
- Network range: ✓
- Country: ✓

## Price

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

## Charges

- Also pays for: from the same budget: 529 other fourzerotwo calls: 500 a day

## Not found

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

## In their words

- Their pitch: Network, organisation, range, country and abuse email for an IP, from the regional internet registry.

## Data

- Keep data: no API terms
- Use data: Keep the attribution when you show the data.

## Plan

- Pay: $0
- Enough for: 90 calls a month

## Rate limit

- Per day: 3
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: ip
- Method: GET
- Path: /v1/domains/ip-owner

## About the plan

- Plan: Free key
- Who can get it: anyone with an email address

## The 5 fields the plan's answer can hold

organization, network name, IP range, country, abuse email

## fourzerotwo's plans (5)

- [fourzerotwo, free key, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-domains-ip-owner/llms.txt): $0.00 per 1,000, 30% complete
- [fourzerotwo, pay as you go, x402 pay per call, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/pay-as-you-go-x402-pay-per-call-get-v1-domains-ip-owner/llms.txt): $2.00 per 1,000, 30% complete
- [fourzerotwo, $5 pack, Card credit $5, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/5-pack-card-credit-5-get-v1-domains-ip-owner/llms.txt): $2.00 per 1,000, 30% complete
- [fourzerotwo, $20 pack, Card credit $20, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/20-pack-card-credit-20-get-v1-domains-ip-owner/llms.txt): $2.00 per 1,000, 30% complete
- [fourzerotwo, $50 pack, Card credit $50, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/50-pack-card-credit-50-get-v1-domains-ip-owner/llms.txt): $2.00 per 1,000, 30% complete

## fourzerotwo's calls for this API (4)

- `GET /v1/ip-geolocation/batch`: [fourzerotwo, free key, GET /v1/ip-geolocation/batch](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-ip-geolocation-batch/llms.txt)
- `GET /v1/ip-geolocation/lookup`: [fourzerotwo, free key, GET /v1/ip-geolocation/lookup](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-ip-geolocation-lookup/llms.txt)
- `GET /v1/domains/ip-owner`: [fourzerotwo, free key, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-domains-ip-owner/llms.txt)
- `GET /v1/ip-geolocation/asn`: [fourzerotwo, free key, GET /v1/ip-geolocation/asn](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-ip-geolocation-asn/llms.txt)

## fourzerotwo's APIs (8)

- [fourzerotwo: business verification API pricing, 5 plans](https://datacircle.dev/business-verification-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: company discovery API pricing, 5 plans](https://datacircle.dev/company-discovery-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: company enrichment API pricing, 5 plans](https://datacircle.dev/company-enrichment-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: domain WHOIS API pricing, 5 plans](https://datacircle.dev/domain-whois-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: phone validation API pricing, 5 plans](https://datacircle.dev/validate-phone-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: web scraping API pricing, 5 plans](https://datacircle.dev/web-scraping-apis/fourzerotwo/free/llms.txt)
- [fourzerotwo: IP company lookup API pricing, 5 plans, GET /v1/domains/ip-owner](https://datacircle.dev/ip-company-lookup-apis/fourzerotwo/free-key-get-v1-domains-ip-owner/llms.txt)

## fourzerotwo: IP company lookup API alternatives

- [WhoisFreaks, $2,000 pack, 1,000,000 API Credits, POST /v1.0/geolocation](https://datacircle.dev/ip-company-lookup-apis/whoisfreaks/2000-pack-1000000-api-credits-post-v1-0-geolocation/llms.txt): $2.00 per 1,000, 60% complete
- [ipv4.fr, pay as you go, x402 pay-per-call, GET /x402/v1/ip-asn/{ip}](https://datacircle.dev/ip-company-lookup-apis/ipv4-fr/pay-as-you-go-x402-pay-per-call-get-x402-v1-ip-asn-ip/llms.txt): $2.00 per 1,000, 30% complete
- [IPScanner, $5 pack, Pay as you go $5, POST /ip/lookup](https://datacircle.dev/ip-company-lookup-apis/ipscanner/5-pack-pay-as-you-go-5-post-ip-lookup/llms.txt): $2.00 per 1,000, 50% complete
- [GlianaAI, pay as you go](https://datacircle.dev/ip-company-lookup-apis/glianaai/pay-as-you-go/llms.txt): $2.00 per 1,000, 30% complete

## 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://fourzerotwo.si/apis/domains/ip-owner?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://fourzerotwo.si/catalog.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://fourzerotwo.si/credits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://fourzerotwo.si/free?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://fourzerotwo.si/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://fourzerotwo.si/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing