cottonon.com                   has IPv4  has IPv6  ::  (time=0.000234)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000248)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000262)
hofstra.edu                    has IPv4  has IPv6  ::  (time=0.000126)