Here are the facts, based on public records. I believe that Sidley has confirmed these with ICANN counsel as well.
ICANN
currently owns three trademarks associated with IANA: IANA, INTERNET ASSIGNED NUMBERS AUTHORITY and the IANA logo. ICANN owns three United States
trademark registrations, one for each of these trademarks.
ICANN was the original applicant for these three registrations. These three registrations are detailed in the attached document.
The
University of Southern California assigned the three trademarks to ICANN,
along with earlier registrations for two of the three trademarks (the logo was not covered by a
registration or application at that time). After ICANN procured new registrations for the two word marks, and a registration for the logo, the two registrations acquired from USC
were allowed to lapse (likely because the new registrations are broader and more protective than the original USC registrations). This is also detailed in the attached document. The USC-ICANN assignment is also attached.
(Note that, under US trademark law, trademark rights arise from use rather than registration. A trademark registration confirms and strengthens the owner's trademark rights, but does not create the trademark right. That is why I have referred to the "trademarks" and the "trademark registrations" separately.)
ICANN also owns three domain names associated with IANA: iana.org, iana.com and iana.net. All three domain names seem to lead to the same content.
I hope this helps.
Greg Shatan