ARIN Whois/RDAP
Operator: American Registry for Internet Numbers, Ltd., United States
Official registry access for IP networks, AS numbers, organisations and network contacts.
Technical Infrastructure
Product
ARIN Whois/RDAP as public registry access. Paid allocation and management of IP addresses and AS numbers are a different service.
Availability and source date
Active
As of: 16 October 2026.
No functionality test has been performed.
Use in OSINT research
Shows which organisation was allocated an IP address or ASN and which registry contacts are recorded. The entry does not identify an individual internet user.
Queries
| Input | Result | Result type |
|---|---|---|
| IP address | Registered network, allocated organisation, address range and recorded contacts. | Retrieved |
| ASN | Registry entry for the autonomous system, with organisation and contacts. | Retrieved |
| Company / organisation name | Matching organisation or contact entries and associated number resources. | Retrieved |
| Person name | Publicly recorded contact objects in the network registry, not a general people search. | Retrieved |
| Domain / website | RDAP registration data from the responsible domain registry or reverse DNS data. | Retrieved |
Features
- Look up IPv4, IPv6 and CIDR networks in the registry.
- Display AS numbers and their associated organisations.
- Search for organisation and network contacts by name.
- Display registry contacts, assignments and modification dates.
- Forward domain queries to the responsible RDAP registries.
- Retrieve registry data as JSON through RDAP.
Categories
- Technical Infrastructure
- IP & ASN
- Domains & WHOIS
Coverage
Geographical coverage
US · CA · Caribbean and North Atlantic, selected territories
Dataset
Primary registry for allocated internet number resources in the ARIN region. The RDAP frontend can also retrieve data from other regional registries and domain registries; the source is shown in the result.
Access
Requirements
Public web search without an account. RDAP queries over HTTPS; resource management uses separate accounts and fees.
Export
RDAP returns JSON; the web interface presents the same information as HTML. Traditional Whois returns text.
Provider
American Registry for Internet Numbers, Ltd.
Country of establishment
United States
Interfaces
API
Available. Public REST interface through RDAP with JSON responses. Whois-RWS is documented separately as an older ARIN-specific service.
MCP
Not documented. Not specified on the product and API pages reviewed.
AI agents
Not documented. Not specified on the product and API pages reviewed.
Usage note
The Whois terms allow technical and operational internet research; integration into commercial products or services, and advertising and marketing, are prohibited.
Legal note
Limitations
- Registry data shows allocations and recorded contacts. It establishes neither the current connection user nor their location.
- Its own registry region covers the USA, Canada and certain island territories. Data for other regions is obtained through RDAP from their responsible registries.
- The data terms restrict the service to technical internet research. Commercial services and products, and marketing use, are excluded.
Guides and practical reports
Official · ARIN: Whois search and results
ARIN · EN
Explains IP, ASN, name and domain searches and the origins of registry information.