cottonon.com                   has IPv4  has IPv6  ::  (time=0.000093)
ecust.edu.cn                   has IPv4  has IPv6  ::1  (time=0.000099)
edu22.info                     has IPv4  has IPv6  ::1  (time=0.000201)
zgsr.gov.cn                    has IPv4  has IPv6  ::1  (time=0.000206)