There are many websites that track dapps like http://dappradar.com or https://www.dapp.com. Unlike Etherscan one particular dapp doesn’t have to be registered on such specific website in order to be listed.
As a result, many dapps whose source code and/or tag is unknown to Etherscan can be found on such websites. Thus if you have the name of Dapp you can find its contract address
However, there are many times, where I find the address first, but not the website nor the name.
So how to search dapps by addresses instead of by name in order to find how to gamble on that game for example ?