WHOIS lookup API. Full registration details in one call.

Pass any domain and get back the registrar, name servers, status flags, creation and expiry dates, and DNSSEC status — in structured JSON.

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What the WHOIS Lookup API Does

One endpoint. Registrar, name servers, status flags, and registration dates for any domain.

Structured output

Every response includes the registrar name, the full list of authoritative name servers, EPP status codes, creation/update/expiry dates, and whether DNSSEC is enabled.

{
  "domain": "example.com",
  "registrar": "RESERVED-Internet Assigned Numbers Authority",
  "name_servers": ["A.IANA-SERVERS.NET", "B.IANA-SERVERS.NET"],
  "status": ["clientTransferProhibited"],
  "created_date": "1995-08-14T04:00:00Z",
  "expiry_date": "2024-08-13T04:00:00Z",
  "dnssec": true
}

Simple to integrate

One path parameter: the domain name. No SDK, no configuration. A single GET request returns everything a domain monitoring or lead-enrichment tool needs.

GET /v1/networking/whois/example.com
Host: requiems.xyz
requiems-api-key: YOUR_API_KEY

Query Domain Registration Data in Any Workflow

From domain marketplaces to security research — any product that needs registration data can use the WHOIS Lookup API.

Domain transfers

Verify ownership before a transfer

Check registrar and status flags like clientTransferProhibited before initiating or approving a domain transfer.

Monitoring

Track domain expiry dates

Poll expiry_date on a schedule and alert your team before a business-critical domain lapses.

Sales & marketing

Enrich lead data with registration details

Add registrar and domain-age context to inbound leads to help qualify prospects and prioritize outreach.

Security

Investigate suspicious domains

Check registration recency and registrar reputation as a signal in phishing and fraud investigations.

Registrars

Power domain marketplaces

Show buyers registrar, status, and expiry information for domains listed on aftermarket or auction platforms.

SaaS

Add domain intelligence to your platform

Integrate WHOIS data into CRM, security, or domain management tools via a single authenticated API call.

Use together with complementary APIs.

WHOIS Lookup works even better when paired with other Requiems APIs.

WHOIS + MX Lookup

Benefit: Combine registration data with mail server configuration for a fuller domain profile.

Outcome: Assess both who owns a domain and how its email is configured in a single enrichment pass.

WHOIS + Domain Checker

Benefit: Cross-check availability and DNS records alongside full WHOIS registration details.

Outcome: Get a complete picture of a domain's status — available, registered, or expiring — in one workflow.

WHOIS + VPN & Proxy Detection

Benefit: Pair domain registration signals with IP-based risk scoring.

Outcome: Strengthen fraud and abuse investigations with both domain-level and IP-level trust signals.

Frequently Asked Questions

Still have questions? Contact support

Add WHOIS lookups to your product with Requiems.

One API key. WHOIS lookup, MX lookup, domain checker, and 50+ other APIs.

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