A number of sites offer free DNS hosting, either for second level domains registered with registrars which do not offer free (or sufficiently flexible) DNS service, or as third level domains (selection.somedomain.com). These services generally also offer Dynamic DNS. Free DNS typically includes facilities to manage A, MX, CNAME, TXT and NS records of the domain zone.In many cases the free services can be upgraded with various premium services.
Free DNS service providers can also make money through sponsorship. The majority of modern free DNS services are sponsored by large providers of a telecommunication services.