参考这个文章：
.edu domain name registration is limited to fully accredited postsecondary institutions of higher learning, such as four-year colleges. .edu domain registration is for the most part _limited to schools located in the United States. _.edu domain name registration is handled exclusively by EDUCAUSE, a nonprofit organization working to promote the intelligent use of information technology in education. Their FAQ provides complete eligibility information.
也就是说.edu域名只对美国的大学开放的。不过看到一个韩国的学校也在用.edu域名？奇怪…
更新（20190214）： ustc.edu，中科大也在用。据说是多年前校友注册的…
