cottonon.com                   has IPv4  has IPv6  ::  (time=0.000139)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000185)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000113)
pega.com                       has IPv4  has IPv6  ::  (time=0.000109)