Use this Google query:
site:
www.yoursite.com
to see if your site is indexed.
Use this Google query:
site:yoursite.com
to see if your subdomains are being indexed as well.
The site isn't being banned from Adsense, it's the owner using the domain that is or may be banned from the Adsense program.
You would have to verify if the domain is indexed and thus not banned by doing above queries.
If it's not showing in the index then it's penalized (banned) or still very new.
