cottonon.com                   has IPv4  has IPv6  ::  (time=0.000117)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000259)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000124)
hofstra.edu                    has IPv4  has IPv6  ::  (time=0.000288)