Ownership

A Google patent states:

Valuable (legitimate) domains are often paid for several years in advance, while doorway (illegitimate) domains rarely are used for more than a year. Therefore, the date when a domain expires in the future can be used as a factor in predicting the legitimacy of a domain.” Thus, if you are serious about creating a website for a long-term business, you should register the domain for a longer period.

A Google update in December of 2011 decreased search visibility of parked (reserved) domains.

Volatile site ownership may prompt Google to “reset” the site's history, nullifying the effects of links pointing to the domain. A penalized domain may carry the penalty over to the new owner.

In February 2013, Google CEO Eric Schmidt famously claimed: “Within search results, information tied to verified online profiles will be ranked higher than content without such verification, which will result in most users naturally clicking on the top (verified) results.”

Refrain from hiding your personal information when registering for a domain. Googler Matt Cutts is quoted as stating:“...When I checked the WhoIs on them, they all had “WhoIs privacy protection service” on them. That's relatively unusual. ...Having WhoIs privacy turned on isn't automatically bad, but once you get several of these factors all together, you're often talking about a very different type of webmaster than the fellow who just has a single site or so.”

If Google identifies a particular person as a spammer, it makes sense that they would scrutinize other sites owned by that person.If your server's IP address is flagged for spam, it may affect all sites on that server.

Depending on your site's hosting plan, you may share a server with several other sites. If that's the case, and your shared server features spammy sites, it can potentially affect your website's ranking in Google search results. According to Google Webmasters, though, “Google understands that shared web hosting happens. You can't control or help who else is on that IP address of Class C subnet.” It's more so when a server features 99 percent of spammy sites that Google may take a second look at your website.