| string "OK" | 
        "No error occured."
        | 
        Target was resolved properly.
        | 
        NULL
        | 
| const INPUT_ERROR | 
        "User input is unusable target"
        | 
        The target given cannot be used.
        | 
        Check target parameter: A string with a single domain or
        IP, or a one-dimensional array with domain or IP in every element
        | 
| const NETGEO_HTTP_ERROR | 
        "Netgeo unreachable"
        | 
        A connection to the Netgeo service could not be established.
        | 
        Check http://netgeo.caida.org/perl/netgeo.cgi (the default server URL used).
        If the script moved, use the parameter $alternateServerUrl in Net_Geo().
        |