cottonon.com                   has IPv4  has IPv6  ::  (time=0.000113)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000256)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000135)
ia.ac.cn                       has IPv4  has IPv6  ::1  (time=0.000124)