cottonon.com                   has IPv4  has IPv6  ::  (time=0.000146)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000172)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000118)
pega.com                       has IPv4  has IPv6  ::  (time=0.000078)