Domain Factors:
1. Domain Age:
Matt Cutts states that: "the difference between a domain that's six months old verses one year ols is really not that big at all". In other words, they do use domain age... but it's not very important.
2. Keyword Appears in Top Level Domain:
Doesn't give the boost that is used to but having your keyword in the domain still acts as relevancy signal.
3. Keyword as First Word in Domain
SEOMoz's 2011 Search Engine Ranking Factors panelists agreed that a domain that starts with their target keyword has an edge over sites that either don't have the keyword in their domain or have the keyword in the middle or end of their domain.
4. Domain Registration length:
A Google patent states: "Valuable domains are often paid for several years in advance, while doorway 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.
5.Keyword in Subdomain Name:
SEOMoz'z panel also agreed that a keyword appearing in the subdomain boosts rank.
You can check keywordABC[dot]com
6. Domain History
A site with volatile ownership or several drops may tell Google to "reset" the site's history, negating links pointing to the domain.