What is Open Source Excellence? Open Source Excellence is EthDNS on the Ropsten Testnet for the .opensource-excellence domain. Because .opensource-excellence is not a registered DNS top-level domain it is normally inaccessible from DNS, but by appending .com to the domain the relevant information can be obtained. For example, a DNS A record request for mydomain.opensource-excellence.com would look up the A records in ENS for mydomain.opensource-excellence.