cugb.edu.cn                    has IPv4  has IPv6  ::1  (time=0.000094)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000230)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000102)
hofstra.edu                    has IPv4  has IPv6  ::  (time=0.000108)