Nostr and bitcoin based dns - nomen

DHT based public key dns pkdns - pkarr based dns setup compatible with existing dns pkarr - Public Key Addressable Resource Records

ETH based ens system https://ens.domains/

Cardano based DNS blinklabs-io/dns-contracts - Decentralized DNS service and marketplace contracts on Cardano

Mesh network naming zhoreeq/meshname - Universal naming system for all IPv6-based mesh networks (CJDNS, Yggdrasil)