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DNS entry is "::1"

I was looking at a prospect's SBS 2008 server and the DNS entries (IPCONFIG /ALL) wer the following:
  :1
  127.0.0.1
  192.168.1.1

I have never seen the entry: ":1" as a DNS entry. Nor have I seen the loopback address as an entry.  The last entry is the router address.

Can someone please enlighten me on the logic behind these entries?

Thanks.
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beyondt
Asked:
beyondt
3 Solutions
 
jessc7Commented:
::1 is the IPv6 loopback address. It is the IPv6 equivalent of 127.0.0.1:

http://www.dslreports.com/faq/11053
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Don JohnstonInstructorCommented:
Looks like you missed a ":".

In an IPv6 address contiguous 0's can be represented by ::. So an address of FC80:0000:0000:0000:0000:000:0000:0001 can be expressed as FC80::1.

The address of ::1 (or 0000:0000:0000:0000:0000:0000:0000:0001) is the IPv6 loopback address.
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beyondtAuthor Commented:
So is it acceptable to have the DNS point to the Loopback addresses and the Router address?  Are there advantages to this as opposed to having it point to the SBS machince address?
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aoakeleyCommented:
The router address should not be in there. It should only point to itself.
  ::1
  127.0.0.1
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beyondtAuthor Commented:
Thanks for all three of the answers.  They cleared this up for me.
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