IANA has primarily been responsible with assigning address blocks to five regional internet registries (RIR). A tech needs to research address blocks assigned in the United States. Which RIR should the tech contact?

The American Registry for Internet Numbers ARIN

Explanation:

The American Registry for Internet Numbers (ARIN) is a not for profit organization that serves as the administrator and distributor of Internet numeric resources such as IP addresses (IPv4 and IPv6) ASN for the United States, Canada, as well as North Atlantic and Caribbean islands

There are four other Regional Internet Registry including APNIC, RIPE NCC, LACNIC and AFRINIC.

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