ARIN Lookup

ARIN's Role

ARIN (American Registry for Internet Numbers) is a Regional Internet Registry (RIR) that manages the distribution of Internet number resources in North America, including the United States, Canada, and parts of the Caribbean.

• • Allocates IPv4 and IPv6 address space
• • Assigns Autonomous System Numbers (ASNs)
• • Maintains registration database (Whois)
• • Provides policy development forum

Coverage Area

ARIN serves the United States, Canada, and many Caribbean and North Atlantic islands.Other regions are served by different RIRs like RIPE NCC (Europe), APNIC (Asia-Pacific), LACNIC (Latin America), and AFRINIC (Africa).

Network Information

• • Handle:Unique identifier for the network record
• • Start/End Address:IP address range boundaries
• • CIDR:Network block in CIDR notation
• • Type:Assignment type (Direct Assignment, Reallocation, etc.)
• • Registration Date:When the network was first registered

Organization Details

• • Name:Legal name of the organization
• • DBA Name:"Doing Business As" name if different
• • Address:Physical location of the organization
• • Registration Date:When the organization was registered with ARIN

Contact Information

• • Admin Contact:Administrative point of contact
• • Tech Contact:Technical point of contact
• • Abuse Contact:Contact for reporting network abuse

No Results Found

• • IP address may be in a different RIR's region (try RIPE, APNIC, etc.)
• • Private IP addresses (10.x.x.x, 192.168.x.x) are not in ARIN database
• • Organization name may be spelled differently or abbreviated
• • ASN may not be allocated or may be in a different format

Incomplete Information

• • Some fields may be marked as "N/A" if not provided by the registrant
• • Contact information may be redacted for privacy reasons
• • Historical data may be limited for older registrations

Best Practices

• • Use specific IP addresses rather than ranges when possible
• • Try different variations of organization names
• • Cross-reference with other RIR databases for global coverage
• • Check multiple contact types for complete information