[Guy Harris <guy@xxxxxxxxxxxx>]

Is there any reason why people care about the list of IP addresses  
other than "I'm on a multi-homed machine, and I want to capture  
traffic to and from machine YYY, so I need to know what the IP  
addresses are for the interfaces, so I can figure out which interface  
I need to capture on"?

If not, then perhaps what's needed is a tool that, at least for IPv4  
addresses, takes an IP address as input and tells you which interface  
traffic to and from that address will go (if it can actually ask the  
OS that question or some similar routing question, it should do that,  
otherwise it can at least answer the question based on IP addresses  
and netmasks for addresses on the machine's LAN segments).