arp -a is not that good as you get the entire arp cache. ipconfig /all is much better as it allows you to parse data per interface.

I guess this is TIMTOWTDI, but using ipconfig /all allows you to write a reusable sub that returns all of the parsed data for you, and allows you to pick and choose which of that data you want to use. I guess I'm lazy and just do all the work up front and never have to deal with it again :)

"Nothing is sure but death and taxes" I say combine the two and its death to all taxes!