Eligibility for a .edu domain name is limited to U.S. postsecondary institutions that are institutionally accredited, i.e., the entire institution and not just particular programs, by agencies on the U.S. Department of Education’s list of Nationally Recognized Accrediting Agencies. These include both "Regional Institutional Accrediting Agencies" and "National Institutional and Specialized Accrediting Bodies" recognized by the U.S. Department of Education.
Note that institutional accreditation is required for .edu eligibility; program accreditation is not sufficient. Not all agencies accredit institutions. Some accredit only institutions, some accredit only programs, and others accredit both institutions and programs.
It is also important to note that, while every effort is made to keep the EDUCAUSE list up-to-date, the U.S. Department of Education's list of Nationally Recognized Accrediting Agencies and State Agencies are the only official comprehensive lists of agencies.