DNS - Computer Definition
- Domain Name System.The naming convention that divides the Internet into logical domains identified in Internet Protocol version 4 (IPv4) as a 32-bit portion of the total address.The standard convention is email@example.com, where user is the name of the end user, organization is the name of the enterprise or other organization owning or sponsoring the address, and domain is the type of entity owning or sponsoring the address.The administration of the DNS is the responsibility of Internet Corporation for Assigned Names and Numbers (ICANN). See also domain, ICANN, Internet, and IPv4.
- Domain Name Server. All Internet domain names are maintained in mirrored databases on root servers distributed around the world. These servers are updated by the domain registrars. Thousands of Domain Name Resolvers (DNRs) located strategically with Internet Service Providers (ISPs) and institutional networks periodically download database updates from the root servers. See also database, DNR, Internet, ISP, root, and server.
(Domain Name System) A system for converting hostnames and domain names into IP addresses on the Internet or on local networks that use the TCP/IP protocol. For example, when a Web site address is given to the DNS either by typing a URL in a browser or behind the scenes from one application to another, DNS servers return the IP address of the server associated with that name. In this hypothetical example, www.company.com would be converted into the IP address 188.8.131.52. Without DNS, you would have to type the four numbers and dots into your browser to retrieve the Web site, which, of course, you can do. Try finding the IP of a favorite Web site and type in the dotted number instead of the domain name! See IP address. A Hierarchy of Servers The DNS system is a hierarchy of database servers that start with the root servers for all the top-level domains (.com, .net, etc.). The root servers point to the "authoritative" servers located in ISPs and in companies that turn the hostnames into IP addresses; the process known as "name resolution." Using the example www.company.com, COMPANY.COM is the domain name, and WWW is the hostname. The domain name is the organization's identity on the Web, and the hostname is the name of the Web server within that domain (see WWW). See DNS records, zone file, reverse DNS, recursive DNS, DDNS, HOSTS file, mDNS, ping, root server and WINS.
dns - Medical Definition
- Director of Nursing Services
- Doctor of Nursing Services