Domain Research Suite
Operator: Whois API, Inc., United States
Researches domain registrations, historical WHOIS data and technical connections, and monitors changes.
Technical Infrastructure
Product
WhoisXML API web suite for current and historical domain and DNS data.
Availability and source date
Active
As of: 16 October 2026.
No functionality test has been performed.
Use in OSINT research
Links domains to registration details and DNS data. Provides leads for infrastructure research from a secondary source.
Queries
| Input | Result | Result type |
|---|---|---|
| Domain / website | Current or historical WHOIS records and changes to domain registration. | Retrieved |
| Person name | Domains whose current or historical WHOIS records contain the search term. | Retrieved |
| Company / organisation name | Domains whose current or historical WHOIS records contain the search term. | Retrieved |
| Email address | Domains whose current or historical WHOIS registration details contain the email address. | Retrieved |
| Phone number | Domains whose current or historical WHOIS records contain the search term. | Retrieved |
| Keyword / free text | Domains whose current or historical WHOIS records contain the search term. | Retrieved |
Features
- Retrieves current WHOIS data for a domain.
- Compares earlier registration data and changes.
- Finds domains using names, email addresses and other WHOIS details.
- Emails notifications of changes to monitored domains.
Categories
- Technical Infrastructure
- Domains & WHOIS
Coverage
Geographical coverage
Unknown
Dataset
Current and historical WHOIS and DNS data collected by the provider. Not an official register extract.
Access
Requirements
An account is required. The free account includes 500 DRS credits.
Export
Domain Monitor offers downloadable JSON results.
Provider
Whois API, Inc.
Country of establishment
United States
Interfaces
API
Available. The underlying domain and WHOIS services are also available through APIs. API and web access share DRS credits.
MCP
Available. Separate official MCP server for WhoisXML APIs. It does not control the DRS web interface. An account and API key are required.
AI agents
Available. The underlying APIs can be used through the MCP server with Claude and ChatGPT, among others.
Usage note
The standard terms permit internal use of the data; redistribution and AI model training require a separate agreement.
Legal note
Limitations
- Redacted registrant data often remains unknown; historical information may be outdated.
- A match for a name or contact address does not establish current ownership.
- The data comes from the provider and does not replace information from the responsible registry.
Guides and practical reports
Official · Researching domain data despite WHOIS redaction
WhoisXML API · 03/2026 · EN
Explains the use of historical WHOIS data and the limits of redacted information.
Sources
- Domain Research Suite: Product overview
- Domain Research Suite: Free allowance
- Domain Research Suite: Domain Monitor
- Domain Research Suite: Provider and contact
- Domain Research Suite: Official guide
- Domain Research Suite: WHOIS history
- Domain Research Suite: Reverse WHOIS
- Domain Research Suite: General terms of use
- Domain Research Suite: Terms of use
- Domain Research Suite: MCP server