solo tienes que realizar un ping a la direccion de la pagina, por ejemplo
ping
www.google.com esta seria la respuesta
64.233.179.104 104 241 56
Ping Successful
99 packets received out of 99 packets transmitted : 0% PACKET LOSS
Round Trip Time (in milliseconds) Max/Min/Av: 284/98/134
pero si quieres informacion mas detallada entra a esta pagina
http://www.network-tools.com/nslook/ esta te mostrara lo siguiente
[66.98.244.52] returned a non-authoritative response in 31 ms: Answer records
name class type data time to live
www.google.com IN CNAME
www.l.google.com 900s (15m)
Authority records
name class type data time to live
google.com IN NS ns1.google.com 345600s (4d)
google.com IN NS ns2.google.com 345600s (4d)
google.com IN NS ns3.google.com 345600s (4d)
google.com IN NS ns4.google.com 345600s (4d)
Additional records
name class type data time to live
ns1.google.com IN A 216.239.32.10 345600s (4d)
ns2.google.com IN A 216.239.34.10 345600s (4d)
ns3.google.com IN A 216.239.36.10 345600s (4d)
ns4.google.com IN A 216.239.38.10 345600s (4d)
ojala te sirva.... Si no es eso porfa explicalo mejor...