GNU Alternative Domain System
GNUnet includes an implementation of the GNU Alternative Domain System (GADS), a decentralized and censorship-resistant replacement for DNS. In GADS, each user manages his own master zone which is mapped into the DNS namespace under the .gads top level domain. Users can delegate subdomains to zones managed by other users. Lookups of records defined by other users are performed using GNUnet's DHT. A major problem of this approach is that names are no longer globally unique, requiring the use of proxies and other workarounds to address common requirements of legacy applications.
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