original_string: public static function get6to4()
      {
          if (self::$sixToFour === null) {
              self::$sixToFour = self::fromString('2002::/16');
          }
  
          return self::$sixToFour;
      }
code: public static function get6to4()
      {
          if (self::$sixToFour === null) {
              self::$sixToFour = self::fromString('2002::/16');
          }
  
          return self::$sixToFour;
      }
code_tokens: public static function get6to4 ( ) { if ( self :: $ sixToFour === null ) { self :: $ sixToFour = self :: fromString ( '2002::/16' ) ; } return self :: $ sixToFour ; }
docstring: Get the 6to4 address IPv6 address range.
  
  @return self
docstring_tokens: Get the 6to4 address IPv6 address range .