You may have heard of Beall's List, a list of publishers/journals that the site's author Jeffrey Beall considered to be predatory. The site hosting the list has been taken down, but the list, current as of the date it was taken down in January 2017, is available via the WayBack Machine.
However, there has been some valid criticism of Beall's methods such that there may be legitimate publishers/journals on his list. Rather than relying on Beall's List, apply the criteria outlined in the CARL document to assess the publishing practices of the journal of interest.