Elige una IP a la que hacer el ping, porque la web de Yahoo no reside en un único servidor, sino en varios y si hacéis los pings a servidores distintos, podéis encontraros unas diferencias de retardos muy grandes...
Resultado de hacer dig en dos redes distintas:
Red 1:
;; QUESTION SECTION:
;www.yahoo.com. IN A
;; ANSWER SECTION:
www.yahoo.com. 1531 IN CNAME www.yahoo.akadns.net.
www.yahoo.akadns.net. 67 IN A 216.109.117.205
www.yahoo.akadns.net. 67 IN A 216.109.118.64
www.yahoo.akadns.net. 67 IN A 216.109.125.66
www.yahoo.akadns.net. 67 IN A 216.109.125.70
www.yahoo.akadns.net. 67 IN A 216.109.125.71
www.yahoo.akadns.net. 67 IN A 216.109.125.76
www.yahoo.akadns.net. 67 IN A 216.109.125.79
www.yahoo.akadns.net. 67 IN A 216.109.117.204
Red 2:
;; QUESTION SECTION:
;www.yahoo.com. IN A
;; ANSWER SECTION:
www.yahoo.com. 216 IN A 216.109.125.77
www.yahoo.com. 216 IN A 216.109.125.64
www.yahoo.com. 216 IN A 216.109.125.76
www.yahoo.com. 216 IN A 216.109.125.66
www.yahoo.com. 216 IN A 216.109.125.78
www.yahoo.com. 216 IN A 216.109.117.205
www.yahoo.com. 216 IN A 216.109.125.74
www.yahoo.com. 216 IN A 216.109.117.204
:-P