Question for SEO experts.
 

Does google ban by IP or by DNS name?

Example: 10 sites are hosted on same virtual account with same IP. If one gets banned do the rest get banned also because they are on the same IP? I would think Google would ban by DNS name and not IP because there are many mainstream companies on virtual accounts sharing same IP with others.

The whole IP would only get banned if all the sites were linked together, in the rare chance that google would ban a whole ip.

tip-

try searching google images advanced for any images on the banned domain

Domain names are most common, IP is rare, an entire DNS (or basically a host) seems way too severe to even be possible.
WG

I eat paste

Most likely, just the domain . . . but no one really knows for sure

Domain Names - Seen it and live it
IP - Seen it and lived it
DNS Server Ban - Seen it and lived it

Helpful hint: Make note of their internal IPs and write a script to e-mail you when their IPs show up in your log files. The quicker you know they are looking the more you can decrease the pain. No matter how advanced they tout themselves, they still do a lot of stuff by hand.

They get hard edge when you make them look like fools. They wiped out every domain I was getting links fro, every domain I was linking to, and every domain that was using my DNS servers. I went from 100,000 uniques a day for 1 year+ to nothing in 2 hours.

I built it back up over a few months, but the hard lesson was separating everything you do into separate areas. Different IPs, different hosts, different DNS servers, different domain info, different countries, no links between the separate worlds, etc etc. Page naming styles, etc need to be different also.

The point is to build, and not get shut down. Having to start over every couple of months is an amateur's game.

Yup I Agree.

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they ban DNS as well, but not if it belongs to a host