How can I list all virtual networks for a given network interface in linux?

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http://serverfault.com – How can I do this? List all virtual networks created for a given network interface card? I have added a virtual network like this, ifconfig eth0:0 inet6 add ::123/64 It's responding fine. And I know I can use that network, because I added it. But if i didn't, how would I go about it? Thank you! (HowTos)