http://www.ris.ripe.net/cgi-bin/risas.cgi

Select output format "graphical".  The really nice feature is that you
can do this for any time in the recent past and from multiple view
points because it works off a database of BGP data collected in 9 places
all over the globe.  Feedback welcome! 

The netlantis tool mentioned earlier works off (part of?) this data and
produces a nicer output for some purposes. 

Daniel

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