'list' provides a list of the sites in the database and the time at
 which they were last updated.  There is an optional regular expression
 argument to limit the list to specific sites.

 Note that the numerical (IP) address associated with a site name is
 valid at the listed time, but since they do occasionally change, it is
 possible that a discrepancy may occur until that site is updated in our
 database. Furthermore, the listed IP address is the primary, as listed
 in the DNS database: secondary addresses are not stored.

 Usage:

    list [<regex>]


 Examples:

    list

 will list all sites in the database, while

    list \.de$

 lists all German sites.

 For further information on regular expressions see the help for 'regex'.