The DX Century Club award is managed by the ARRL. I earned this award in 2004 by providing proof (through the stack of QSL cards I had collected) that I had communicated with at least 100 different "entities" (countries, or independent or distant portions of a given country). Since then I've been adding to the collection. In the Spring and Summer of 2016 I was finally able to complete two major milestones in this awards program. I have DXCC on eight bands (80m, 40m, 30m, 20m, 17m, 15m, 12m, and 10m), shown on the 5BDXCC plaque with the three additional endorsements. The other milestone was DXCC Challenge for confirming contacts with a thousand different band/country combinations. For example, contacting England on 15m is one slot, contacting France on 12m is another. The next level for this award is 1500 such band/country combinations. That's not likely to happen anytime soon.