Right now I'm experiencing a really low fill rate from PubCenter. I used to get thousands of impressions a day, since 4/1 they have been <200 and no ads when I launch my app on a few of my machines. I have a ticket open with support, but a few things they've said so far have made me think they just don't have the ads to serve.
I just remembered seeing this Tip posted recently: Find IP address in a Metro app (Windows 8)[^].
I know that from the title it does not seem to be what you are looking for, but read through the comments and see if it can help you get what you need. I don't have Windows 8 running, so I cannot test it out.
"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty