American Registry for Internet Numbers

ARIN: the regional registry for IP addresses in North America.

ARIN allocates IP address blocks and AS numbers for the US, Canada and parts of the Caribbean. Its WHOIS lets you look up who owns a netblock, useful when mapping a target's IP space.

Why it's useful

Starting point for finding an organisation's IP ranges.

Category: Reconnaissance & OSINT
Pricing: Free
Tags: ip, whois, registry, recon
Link: www.arin.net