# RelayShield, free: IP company lookup API

> Passive DNS & IP reputation: pass a domain to get its historical IP resolution history plus reputation, or pass an IP to get reverse resolution history (hostnames that have pointed to it), AS owner, country, and malicious/suspicious vendor detection counts

RelayShield's Free key: 100 free calls plan for the IP company lookup API costs $0.00 per 1,000 IP addresses. We check each provider's docs for 10 fields. RelayShield's docs list 2: ASN, Country.
We haven't run RelayShield through [our IP company lookup API benchmark](https://datacircle.dev/best-ip-company-lookup-api.txt) yet.
This plan is free. We rank 468 plans for IP company lookup APIs by price. Half the plans cost $0.167 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's 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), [MxToolbox](https://datacircle.dev/ip-company-lookup-apis/mxtoolbox/free-get-api-v1-lookup-asn/llms.txt) and [Enterno](https://datacircle.dev/ip-company-lookup-apis/enterno/free-open-api-get-api-open-ip/llms.txt) are the best IP company lookup API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/ip-company-lookup-apis/relayshield/free
- [IP company lookup API: the best of 40+ providers compared](https://datacircle.dev/best-ip-company-lookup-api.txt)
- Get it: https://api.relayshield.net/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Request: `POST https://api.relayshield.net/v1/metered/ip-intel`
- API key: with the plan, on https://api.relayshield.net/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- Its API docs: https://api.relayshield.net/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing#/Domain%20and%20infrastructure/metered_ip_intel
- Sold by: RelayShield (https://relayshield.net?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 20%
- ASN: ✓
- Country: ✓

## Price

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

## Charges

- Also pays for: from the same budget: Check an email address against known data breaches · Detect a recent SIM swap or carrier port · Check an email address against infostealer malware logs · Scan a domain for active phishing lookalikes · Find exposed OAuth tokens and SaaS credentials · Assess breach and infostealer risk across vendors · Detect stolen session cookies before they are used · Screen an EVM address and optionally a token contract · Register assets and sweep them against the IOC corpus · Exploit chatter and threat actor lookup · Correlate a CVE with a specific organisation's exposure · Score a domain 0-100 across six identity dimensions · Enrich up to 100 indicators in one call · Discover infrastructure related to one indicator · Find brand abuse across the IOC corpus · Score up to 10 organisations and their agent identities · Find CVEs actively targeting your declared stack · mcp-registry-risk endpoint · Find exposure from breaches that look AI-agent-sourced · Check TLS certificate expiry from CT logs · Identity a suspected phishing/smishing kit · Match a kit or malware identity ID against the corpus · Composite campaign scan across the threat-intel endpoints ($5.50 flat)

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Passive DNS & IP reputation: pass a domain to get its historical IP resolution history plus reputation, or pass an IP to get reverse resolution history (hostnames that have pointed to it), AS owner, country, and malicious/suspicious vendor detection counts

## Data

- Freshness: stored
- Keep data: no limit
- Use data: You may not use the Service to: Violate any applicable law or regulation, Reverse-engineer, scrape, or resell the Service without written permission, Exceed rate limits or attempt to circumvent usage restrictions, Use the Service to target, harass, or surveil individuals, Transmit malware or engage in any activity that disrupts the Service

## Plan

- Pay: $0
- You get: 100 requests
- Enough for: 100 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: at least one of domain or ip, Content-Type header "application/json"
- Method: POST
- Path: /v1/metered/ip-intel

## About the plan

- Plan: Free key: 100 free calls
- Who can get it: anyone with an email address

## The 11 fields the plan's answer can hold

queried value, query type, AS owner, country code, checked at, found, reputation score, malicious votes, suspicious votes, record source, passive DNS records

## RelayShield's plans (5)

- [RelayShield, free](https://datacircle.dev/ip-company-lookup-apis/relayshield/free/llms.txt): $0.00 per 1,000, 20% complete, stored
- [RelayShield, pay as you go, metered to a card](https://datacircle.dev/ip-company-lookup-apis/relayshield/pay-as-you-go-metered-to-a-card/llms.txt): $100.00 per 1,000, 20% complete, stored
- [RelayShield, pay as you go, Pay per call over x402](https://datacircle.dev/ip-company-lookup-apis/relayshield/pay-as-you-go-pay-per-call-over-x402/llms.txt): $100.00 per 1,000, 20% complete, stored
- [RelayShield, $499 monthly](https://datacircle.dev/ip-company-lookup-apis/relayshield/499-monthly/llms.txt): $49.90 per 1,000, 20% complete, stored
- [RelayShield, $999 monthly](https://datacircle.dev/ip-company-lookup-apis/relayshield/999-monthly/llms.txt): no limit, 20% complete, stored

## RelayShield's calls (2)

- `POST /v1/metered/ip-intel`: [RelayShield, free](https://datacircle.dev/ip-company-lookup-apis/relayshield/free/llms.txt)
- `POST /v1/payg/ip-intel`: [RelayShield, pay as you go, Pay per call over x402](https://datacircle.dev/ip-company-lookup-apis/relayshield/pay-as-you-go-pay-per-call-over-x402/llms.txt)

## RelayShield's APIs (1)

- [RelayShield: IP company lookup API pricing, 5 plans](https://datacircle.dev/ip-company-lookup-apis/relayshield/free/llms.txt)

## RelayShield: IP company lookup API alternatives

- [DomScan, $10 pack](https://datacircle.dev/ip-company-lookup-apis/domscan/10-pack/llms.txt): $1.00 per 1,000, 70% complete, stored
- [agentsvc.io, pay as you go](https://datacircle.dev/ip-company-lookup-apis/agentsvc-io/pay-as-you-go/llms.txt): $5.50 per 1,000, 40% complete, stored
- [QuantAgentShop, pay as you go](https://datacircle.dev/ip-company-lookup-apis/quantagentshop/pay-as-you-go/llms.txt): $9.90 per 1,000, 40% complete, stored
- [isMalicious, €49 monthly](https://datacircle.dev/ip-company-lookup-apis/ismalicious/49-monthly/llms.txt): $27.57 per 1,000, 10% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-08.

- https://api.relayshield.net/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://api.relayshield.net/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://api.relayshield.net/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://relayshield.net?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing
- https://terms.relayshield.net?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=ip-company-lookup-api-pricing