ipv6 for websites

I read this article http://blogs.technet.com/b/edgeaccessblog/archive/2012/06/08/directaccess-forced-tunneling-and-world-wide-ipv6-launch.aspx and it said that some website like Bing.com is available in ipv6. What does it mean? How do I see that it is IPv6? Thanks
biggynetAsked:
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Rob WilliamsConnect With a Mentor Commented:
If you run nslookup from a command line it will return the IP's of the site.  Some sites such as Bing and Facebook will return both IPv4 and IPv6 addresses.  For example:  (the lengthy addresses are IPv6)

C:\>nslookup facebook.com
Server:  myserver.domain.local
Address:  192.168.123.123

Name:    facebook.com
Addresses:  2a03:2880:2110:3f01:face:b00c::
          2a03:2880:2110:9f01:face:b00c::
          2a03:2880:10:8f01:face:b00c:0:25
          2a03:2880:10:cf01:face:b00c::

          69.171.247.21
          66.220.149.88
          66.220.152.16
          66.220.158.70
          69.171.234.21
          69.171.237.16


C:\>nslookup www.bing.com
Server:  myserver.domain.local
Address:  192.168.123.123

Non-authoritative answer:
Name:    a134.dsw3.akamai.net
Addresses:  2600:807:320::1743:f492
          2600:807:320::1743:f478
          24.222.202.241
          24.222.202.231
Aliases:  www.bing.com
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biggynetAuthor Commented:
My nslookup did not give me ipv6.

C:\nslookup facebook.com
Server:  jclub
Address:  192.168.1.1

Non-authoritative answer:
Name:    facebook.com.zoominternet.net
Addresses:  69.16.143.102, 198.105.251.14
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Rob WilliamsCommented:
The results for nslookup of large sites, such as facebook, can vary depending on your location as they have DNS servers all over the world and your query is directed to the most efficient location. Note that your results also return different IPv4 servers.  IPv6 enabled sites are still quite rare and IPv6 is not supported globally as of yet.

All sites will eventually be IPv6 as we are running out of IPv4 addresses.  IPv6 allows for far more addresses.
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biggynetAuthor Commented:
So when you do your nslookup for facebook.com, did you do it from your PC? And your server (myserver.domain.local) is doing the dns for ipv6. Correct?
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