________ is the authoritative entity which lists port assignments

IANA (Internet Assigned Numbers Authority) is the organization globally responsible for coordinating unique identifiers for the Internet, which includes maintaining the 'Service Name and Transport Protocol Port Number Registry.' This registry lists well-known, registered, and dynamic/private port numbers for various network services.

ISSA (Information Systems Security Association) is a professional organization for cybersecurity professionals, not an entity responsible for port assignments.

Network Solutions is primarily a domain name registrar and web services provider, not an authority for port assignments.

Register.com is a domain name registrar, similar to Network Solutions, and does not govern port assignments.

InterNIC was an early organization involved in domain name and IP address management, but IANA is the current authoritative body for port assignments.