Final answer:
The best tool for querying data provided by organizations like ARIN is Whois.
Step-by-step explanation:
The best tool for querying data provided by organizations like the American Registry for Internet Numbers (ARIN) as part of a footprinting or reconnaissance exercise is whois.
Whois is a widely used Internet directory service that allows users to look up information about domain names, IP addresses, and autonomous system numbers. It provides details such as the domain registrar, registration date, and contact information for the domain owner or administrator.
Using the Whois tool, you can query ARIN's database to retrieve information about IP addresses assigned to organizations, including the registrant organization, organization contacts, and technical contacts.