I don't think there is a way to tell with SEDO. You may be able to tell with SEDO Pro.
Can you put the domain on your server for a day and check the stats? Maybe put up a single page with adsense if losing the day of parking would be bad. My favorite for getting stats is putting Google Analytics on the page. You will see if it is direct traffic, search engine traffic, or the sites that people are following links from to get to your site.