Look Up Geographical Data on Network Node?

How does a program like VisualRoute look up geographical data on a particular network node? For example, how would I know where this node is located geographically:
0.so-3-0-0.XL1.ATL5.ALTER.NET

Actually I can look at that and see the "ATL" part and know it's Atlanta, but is there a universal database for this type of stuff?

After investigating my copy of VisualRoute, it looks like it's got its own internal database with the geo data, but is there anywhere to look this up on the 'net?

 

 

 

 

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