For anyone else whose ISP doesn't support IPv6:

  PING sprint.net: 56 data bytes
  64 bytes from www.sprint.net (2600::): icmp_seq=0. time=156. ms
  64 bytes from www.sprint.net (2600::): icmp_seq=1. time=151. ms
  64 bytes from www.sprint.net (2600::): icmp_seq=2. time=153. ms
  64 bytes from www.sprint.net (2600::): icmp_seq=3. time=151. ms
  64 bytes from www.sprint.net (2600::): icmp_seq=4. time=151. ms
  
  ----sprint.net PING Statistics----
  5 packets transmitted, 5 packets received, 0% packet loss
  round-trip (ms)  min/avg/max/stddev = 151./152./156./2.5

2600 refers to https://secure.wikimedia.org/wikipedia/en/wiki/2600 (first two articles on the disambiguation page are relevant).