Keyword As First Word in Domain

Importance: Unknown

Type: Relevancy

Once important but not anymore; having the focus keyword of the website, in whole, as the first keyword in your domain name may increase your rankings, as it provides a relevancy factor.

Keyword Appears in Top Level Domain

Importance: Low

Type: Relevancy

Once important but not anymore; having the focus keyword of the website, in whole, in your domain name, may increase your search engine rankings, as it provides a relevancy factor.

Domain Age

Importance: Low

Type: Relevancy

Google does not care about how long ago the domain was registered, as Google determines the age of a domain based on when Google first crawled the domain name.

This is mainly because the whois information of a domain name is not always available; it can vary based on domain name extension and domain name registrar’s whois formatting.

Reference: https://www.youtube.com/watch?v=-pnpg00FWJY

Country TLD extension

Importance: Medium

Type: Relevancy

A website having a domain name country extension, i.e. .ca for Canada, .co.uk for the UK, may have their website rank higher in the country the domain name extension belongs to, but on a global scale, it may reduce that website’s position.

Public vs. Private Whois

Importance: Medium

Type: Trust

A domain name with a private registration, which means their whois information is protected (invisible to the public), may be penalized, as Google sees it as they have something to hide.

Domain Registration Length

Importance: Low

Type: Trust

Google’s US patent US7346839 B2, “Information retrieval based on historical data,” states that Google may use the length of the domain name registration to distinguish between illegitimate and legitimate domains.

Certain signals may be used to distinguish between illegitimate and legitimate domains. For example, domains can be renewed up to a period of 10 years. 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 and, thus, the documents associated therewith.

Reference: http://www.google.com/patents/US7346839