hey there.. I wanted to know if my main domain ( example.com ) gets banned by adsense, does that mean all its sub domain gets banned too ? like can I place ads on ( 123.example.com ) ?????? Please Advice
Yip, once banned, everything will be banned. Be careful there is a rumour they might even ban the IP too.
Yes, I've seen this tragedy happen to a few of my friends unfortunately, but they could have been doing something unwise in Google's eyes. Other times, I've heard of people getting banned for no apparent reason, no click fraud, no anything, I don't get it and feel bad for them because Adsense was their main moneymaker.
how about redirect 301 to the new domain name ? i mean copy the database to new domain and redirect 301 to it ? anyone have to try ?
When your main domain is banned, your subdomains are also banned. You can try to apply on a subdomain, Google will never accept it.