subdomains?

I tried to post in an other tread but... It never showed..

any way, my question is:

I got this spammy looking domain "0nline .se" (with a zero).

If I use this domain to make a some sub domains and the subdomains gets banned or blacklisted. would that only effekt the subdomains and leave me the option to make new subdomains that are still clean?

how does this work, I read some where that a subdomain is like its own domain.

Matt Cutts recently talked about the next Google updated they will be changing how they treat subdomains. Right now they are treated as a separate site all together, when the update comes out it will be treated as just a sub folder. So to answer your question, right now now only your sub domain should be banned, however in the future (next couple of months) your entire site would be banned most likely. There will be exceptions for major hosting company's, social media sites, etc. because they are trusted.

Ahh, ok tank you very much for explaining.