IANA is an acronym for the Internet Assigned Numbers Authority, one of the Internet's oldest institutions. IANA is responsible for managing the root zone of the Domain Name System (DNS), coordinating global Internet Protocol (IP) address allocation, and managing IP numbering systems. Basically, they take care of maintaining and managing the technical functions that keep the Internet running smoothly.

IANA's services are provided by Public Technical Identifiers (PTI), an affiliate of the Internet Corporation for Assigned Names and Numbers (ICANN). Learn more about them on their website, iana.org.