http://technet.microsoft.com/en-us/library/bb726934.aspx

>nslookup
Default Server:  qwestmodem.domain.actdsltmp
Address:  192.168.0.1

> server 205.171.3.25
Default Server:  resolver.qwest.net
Address:  205.171.3.25

> set type=all
> mail.live.com
Server:  resolver.qwest.net
Address:  205.171.3.25

Non-authoritative answer:
mail.live.com   canonical name = dispatch.kahuna.glbdns.microsoft.com
> dispatch.kahuna.glbdns.microsoft.com
Server:  resolver.qwest.net
Address:  205.171.3.25

*** resolver.qwest.net can't find dispatch.kahuna.glbdns.microsoft.com: Non-exis
tent domain
> server 208.67.222.222
Default Server:  resolver1.opendns.com
Address:  208.67.222.222

> mail.live.com
Server:  resolver1.opendns.com
Address:  208.67.222.222

Non-authoritative answer:
mail.live.com   canonical name = dispatch.kahuna.glbdns.microsoft.com
> dispatch.kahuna.glbdns.microsoft.com
Server:  resolver1.opendns.com
Address:  208.67.222.222

*** resolver1.opendns.com can't find dispatch.kahuna.glbdns.microsoft.com: Non-e
xistent domain