The IP of a server identifies it. It can be unique or shared between multiple sites. The date was registered for the first time. The registar is the authority where is registered. Server location specifies where it is physically. The next date will expire. The owner usually renews every year its domain, but some prefer buying more than a year only. Domain age is a measure of how much a site is old. Older sites have normally more importance and are more trustworthy than young ones.