ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000097)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000091)
hofstra.edu                    has IPv4  has IPv6  ::  (time=0.000220)
zimbra.com                     has IPv4  has IPv6  ::  (time=0.000094)