A DNS hosting service is a service that runs Domain Name System servers. Most, but not all,domain name registrars include DNS hosting service with registration. Free DNS hosting services also exist. Almost all DNS hosting services are “shared”; except for the most popular Internet sites, there is no need to dedicate a server to hosting DNS for a single website. Many third-party DNS hosting services provide Dynamic DNS.
DNS hosting service is better when the provider has multiple servers in various geographic locations that minimize latency for clients around the world.
DNS can also be self-hosted by running DNS Software on generic Internal Hosting Services.
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.
Frequently their servers are worldwide located to provide high speed of work, and also high reliability.