You can see every sub that registered a community name on this dashboard: https://dune.com/plebbit/plebbit-protocol That doesn't mean that the sub is currently online and usable but it's a list of all domain names that have an associated subplebbit address record (analogous to an IP address in traditional DNS). Whether they end with .eth or .sol tells you if they were registered on the Ethereum or Solana blockchain. If you want to start your own sub, it's recommended to acquire an ENS/SNS name, so it has a human-readable link like p/pleblore.eth, otherwise it will be something like p/12D3KooWG3XbzoVyAE6Y9vHZKF64Yuuu4TjdgQKedk14iYmTEPWu