cugb.edu.cn                    has IPv4  has IPv6  ::1  (time=0.000235)
ia.ac.cn                       has IPv4  has IPv6  ::1  (time=0.008912)
www.uc.cn                      has IPv4  has IPv6  ::  (time=0.000155)
www.ucweb.com                  has IPv4  has IPv6  ::  (time=0.000092)