# DC5 WHOIS, free, Public instance, GET /api/v1/lookup: IP company lookup API

> Primary endpoint. Query parameters handle IPv6 and URLs cleanly.

DC5 WHOIS's Public instance plan for the IP company lookup API costs $0.00 per 1,000 IP addresses. We check each provider's docs for 10 fields. DC5 WHOIS's docs list 4: Owner's name, ASN, Network range, Country.
DC5 WHOIS limits how many calls you get but gives no number.
In [our IP company lookup API benchmark](https://datacircle.dev/best-ip-company-lookup-api.txt), this plan scores 89.4 out of 100. DC5 WHOIS ranks 3rd of 61 providers.
We rank 530 plans for IP company lookup APIs by price. Half the plans cost $0.239 or less per 1,000 IP addresses. This plan and 39 others tie for the lowest price per 1,000 IP addresses of the 530 plans. [See the best free IP company lookup API plan.](https://datacircle.dev/best-ip-company-lookup-api.txt)
[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/dc5-whois/free-public-instance-get-api-v1-lookup
- [IP company lookup API in 2026: the best of 60+ compared](https://datacircle.dev/best-ip-company-lookup-api.txt)
- Get it: https://whois.dc5.tech/legal/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Request: `GET https://whois.dc5.tech/api/v1/lookup`
- API key: not needed
- Its API docs: https://whois.dc5.tech/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Sold by: DC5 WHOIS (https://whois.dc5.tech?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 40%
- Owner's name: ✓
- ASN: ✓
- Network range: ✓
- Country: ✓

## Score

- Overall score: 89.4
- Price score: 100
- Accuracy score: 91
- Cost to get started score: 100
- Bundle score: 90
- Performance score: 29

## Price

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

## Charges

- Also pays for: from the same budget: Domain lookup · IP lookup · DNS lookup · Reverse DNS lookup · Lookup history snapshots · Diff lookup snapshots · Phase 2 lookup (domain, IP, CIDR, ASN, Web3) · The caller's own IP address · ASPA-based AS_PATH verification

## Not found

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

## In their words

- Their pitch: Primary endpoint. Query parameters handle IPv6 and URLs cleanly.

## Data

- Keep data: no limit
- Use data: Use the service only for lawful infrastructure, security and research purposes. Comply with the acceptable use rules and with the terms of upstream RDAP, WHOIS, DNS and RPC operators. You may use lookup results for your own operational purposes. You may not scrape the service to build a competing bulk WHOIS database. Acceptable use policy, Allowed: Interactive lookups of domains, IPs, CIDRs, ASNs and supported Web3 names you have a legitimate reason to inspect. Modest automated use of the documented API within the published rate limit. Security, abuse-desk, network engineering and similar professional purposes. Not allowed: Bulk harvesting, crawling or mirroring of the API or UI to build a registration database. Bypassing or load-testing rate limits, or using rotating proxies to evade them. Using lookups to stalk, harass, dox or target a natural person. Submitting queries whose only purpose is to overload this service or an upstream registry. Attempting to reach undocumented admin, debug or wallet RPC methods through this console (they are not exposed). Uploading or enabling licensed threat-intel dumps you are not licensed to use, if you operate a copy of this software. Misrepresenting lookup output as a government, ICANN or RIR decision.

## Plan

- Pay: $0

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call
- Median: 0.35 s

## The call

- You send: query. Optional: raw
- Method: GET
- Path: /api/v1/lookup

## About the plan

- Plan: Public instance
- Who can get it: anyone, with no registration, for lawful infrastructure, security and research purposes

## The 27 fields the plan's answer can hold

IP address, organization, network name, network handle, network type, network, CIDR, start address, end address, country, parent network handle, registration date, last changed, ASN, ASN name, ASN organization, ASN country, reverse DNS, contact handle, contact name, contact roles, contact email, contact organization, remarks, links, raw WHOIS text, raw RDAP JSON

## DC5 WHOIS's plans (1)

- [DC5 WHOIS, free, Public instance, GET /api/v1/lookup](https://datacircle.dev/ip-company-lookup-apis/dc5-whois/free-public-instance-get-api-v1-lookup/llms.txt): $0.00 per 1,000, 40% complete

## DC5 WHOIS's calls for this API (2)

- `GET /api/v1/ip`: [DC5 WHOIS, free, Public instance, GET /api/v1/ip](https://datacircle.dev/ip-company-lookup-apis/dc5-whois/free-public-instance-get-api-v1-ip/llms.txt)
- `GET /api/v1/lookup`: [DC5 WHOIS, free, Public instance, GET /api/v1/lookup](https://datacircle.dev/ip-company-lookup-apis/dc5-whois/free-public-instance-get-api-v1-lookup/llms.txt)

## DC5 WHOIS's APIs (2)

- [DC5 WHOIS: domain WHOIS API pricing, 1 plan, GET /api/v1/domain](https://datacircle.dev/domain-whois-apis/dc5-whois/free-public-instance-get-api-v1-domain/llms.txt)
- [DC5 WHOIS: domain WHOIS API pricing, 1 plan, GET /api/v1/lookup](https://datacircle.dev/domain-whois-apis/dc5-whois/free-public-instance-get-api-v1-lookup/llms.txt)
- [DC5 WHOIS: IP company lookup API pricing, 1 plan, GET /api/v1/lookup](https://datacircle.dev/ip-company-lookup-apis/dc5-whois/free-public-instance-get-api-v1-lookup/llms.txt)

## DC5 WHOIS: IP company lookup API alternatives

- [IPKit, free](https://datacircle.dev/ip-company-lookup-apis/ipkit/free/llms.txt): $0.00 per 1,000, 80% complete, 1 day
- [thenetworkery, free](https://datacircle.dev/ip-company-lookup-apis/thenetworkery/free/llms.txt): $0.00 per 1,000, 40% complete
- [MxToolbox, free, GET /api/v1/Lookup/asn/](https://datacircle.dev/ip-company-lookup-apis/mxtoolbox/free-get-api-v1-lookup-asn/llms.txt): $0.00 per 1,000, 20% complete
- [Enterno, free, Scout, GET /api/v4/asn](https://datacircle.dev/ip-company-lookup-apis/enterno/free-scout-get-api-v4-asn/llms.txt): $0.00 per 1,000, 40% complete
- [CrawlSnap, free, GET /v1/ioc/search/ip](https://datacircle.dev/ip-company-lookup-apis/crawlsnap/free-get-v1-ioc-search-ip/llms.txt): $0.00 per 1,000, 40% 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://whois.dc5.tech/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://whois.dc5.tech/legal/acceptable-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://whois.dc5.tech/legal/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://whois.dc5.tech/openapi.yaml?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://whois.dc5.tech/sources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing