A name server is a computer application that implements a network service for providing responses to queries against a directory service . It translates an often humanly meaningful, text-based identifier to a system-internal, often numeric identification or addressing component. This service is performed by the server in response to a service protocol request.
26-481: [REDACTED] Look up ns , nS , or NS in Wiktionary, the free dictionary. NS as an abbreviation can mean: Arts and entertainment [ edit ] Gaming [ edit ] Natural Selection (video game) , a mod for the game Half-Life NetStorm: Islands At War , a real-time strategy game published in 1997 by Activision Nintendo Switch ,
52-401: A caching name server for all other zones. An authoritative name server is a name server that is responsible for giving answers in response to questions asked about names in a zone . An authoritative-only name server returns answers only to queries about domain names for which it is responsible (as specifically configured by its administrator). An authoritative name server can either be
78-459: A primary server or a secondary server. A primary server for a zone is the server that stores the definitive versions of all records in that zone. It is identified in the start-of-authority (SOA) resource record. A secondary server for a zone uses an automatic updating mechanism to maintain an identical copy of the primary server's database for a zone. Examples of such mechanisms include DNS zone transfers and file transfer protocols. DNS provides
104-553: A 1930s Norwegian national socialist political party National Security Department (noted as NS), a law enforcement agency in Hong Kong National service , a name for the conscription system of some militaries National Socialism or Nazism , the ideology held by, among other political parties, the National Socialist German Workers Party New Serbia (political party) ( Nova Srbija ),
130-487: A hybrid video game console and handheld. NationStates , a web-based simulation game Literature [ edit ] New Spring (known to fans as "NS"), a 1999 anthology edited by Robert Silverberg and derivative 2004 novella by Robert Jordan NS-series robots from the book I, Robot Companies [ edit ] National Semiconductor (also known as "Natsemi"), an American integrated circuit design and manufacturing company Nederlandse Spoorwegen ,
156-405: A mechanism whereby the primary for a zone can notify all the known secondaries for that zone when the contents of the zone have changed. The contents of a zone are either manually configured by an administrator, or managed using Dynamic DNS . Every domain name appears in a zone served by one or more authoritative name servers. The fully qualified domain names of the authoritative name servers of
182-601: A name server is the server component of the Domain Name System (DNS), one of the two principal namespaces of the Internet . The most important function of DNS servers is the translation (resolution) of human-memorable domain names and hostnames into the corresponding numeric Internet Protocol (IP) addresses, the second principal name space of the Internet which is used to identify and locate computer systems and resources on
208-572: A political party in Lithuania Places [ edit ] Negeri Sembilan , one of the fourteen states in Malaysia Novi Sad , a city in Serbia (license plate code) Nova Scotia , as the official Canadian postal abbreviation for the province Science and technology [ edit ] Biology and medicine [ edit ] Nervous system , the system of neurons that coordinates
234-634: A political party in Serbia People's Party (Serbia, 2017) ( Narodna stranka ), a political party in Serbia New Slovenia (also known as Nova Slovenija - Krscanski Ljudska Stranka ), a right-of-centre political party in Slovenia People's Party (Montenegro) ( Narodna Stranka ), a political party in the Republic of Montenegro National Alliance (Lithuania) ( Nacionalinis susivienijimas ),
260-493: A prefix for certain system-provided classes in the operating system, such as "NSString" ns (simulator) (or "ns-2"), an open source network simulator Mathematics [ edit ] ns (elliptic function) , one of Jacobi's elliptic functions NS, the Néron–Severi group Other uses in science and technology [ edit ] Nanosecond (abbreviated "ns"), a measure of time Nanostructure Neutron star ,
286-601: A star formed from the collapsed remnant of a massive star New Shepard 3 (NS3), a reusable launch vehicle from Blue Origin, being tested in 2017-18 Newton second , the SI derived unit for momentum Not significant, when differences between categories are smaller than the amount of error/noise in the data, see Statistical significance Nuclear Ship (NS), a ship prefix for civilian ship names Norsk Standard , Norwegian Standard, Standards defined by Standard Norge Other uses [ edit ] National school (Ireland) ,
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#1732858973691312-516: A type of school New Style (as "N.S." in opposition to Old Style as "O.S."), indicating either a date in the Julian Calendar with the start of year adjusted to 1 January, or a date in the Gregorian calendar Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title NS . If an internal link led you here, you may wish to change
338-462: A zone are listed in the NS records of that zone. If the server for a zone is not also authoritative for its parent zone, the server for the parent zone must be configured with a delegation for the zone. When a domain is registered with a domain name registrar , the zone administrator provides the list of name servers (typically at least two, for redundancy ) that are authoritative for the zone that contains
364-575: Is a server that stores the DNS records , such as address (A, AAAA) records, name server (NS) records, and mail exchanger (MX) records for a domain name (see also List of DNS record types ) and responds with answers to queries against its database. Name servers are usually either authoritative or recursive , as described below. Although not the usual practice today, name servers can be both authoritative and recursive, if they are configured to give authoritative answers to queries in some zones, while acting as
390-443: The AA bit. A Recursive Resolver (sometimes called a Recursive Name Server) is a DNS name server that accepts recursive queries (defined below) from clients (who are using a stub resolver), and then resolves those queries, either from a cache of prior results, or by asking one or more authoritative servers. If a name server cannot answer a query because it does not contain an entry for
416-461: The Internet Corporation for Assigned Names and Numbers (ICANN). DNS servers, which are located all over the world, translate domain names into IP addresses, giving them control over which server a user may access via a given domain. Below the root, Internet resources are organized into a hierarchy of domains, administered by the respective registrars and domain name holders. A DNS name server
442-506: The root zone of the Domain Name System and each user system must implement resolver software capable of recursive operation. Caching name servers ( DNS caches ) are usually recursive resolvers that store DNS query results for a period of time determined in the configuration (time-to-live) of each domain-name record. DNS caches improve the efficiency of the DNS by reducing DNS traffic across
468-417: The DNS root zone. It continues until it reaches the authoritative server for the zone that contains the queried domain name. That server provides the answer to the question, or definitively says it can't be answered, and the caching resolver then returns this response to the client that asked the question. The authority, resolving and caching functions can all be present in a DNS server implementation, but this
494-445: The Internet, and by reducing load on authoritative name-servers, particularly root name-servers. Because they can answer questions more quickly, they also increase the performance of end-user applications that use the DNS. Caching name servers are often also recursive name servers—they perform every step necessary to answer any DNS query they receive. To do this the name server queries each authoritative name-server in turn, starting from
520-504: The Internet. The Internet maintains two principal namespaces : the domain name hierarchy and the IP address system. The Domain Name System maintains the domain namespace and provides translation services between these two namespaces. Internet name servers implement the Domain Name System. The top hierarchy of the Domain Name System is served by the root name servers maintained by delegation by
546-461: The actions of an organism Normal saline , a solution of sodium chloride used in intravenous drips Computing [ edit ] Name server , a computer server that implements a name service protocol NS record , a DNS record type Namespace , an abstract container used in computing Neighbor Solicitation, part of IPv6's Neighbor Discovery Protocol NeXTSTEP , an object-oriented, multitasking operating system by NeXT, as well as
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#1732858973691572-458: The domain. The registrar provides the names of these servers to the domain registry for the top-level domain containing the zone. The domain registry in turn configures the authoritative name servers for that top-level domain with delegations for each server for the zone. If the fully qualified domain name of any name server for a zone appears within that zone, the zone administrator provides IP addresses for that name server, which are installed in
598-480: The host in its DNS cache, it may recursively query name servers higher up in the hierarchy. This is known as a recursive query or recursive lookup . A server providing recursive queries is known as a recursive name server or recursive DNS , sometimes abbreviated as recdns . In principle, authoritative name servers suffice for the operation of the Internet. However, with only authoritative name-servers operating, every DNS query must start with recursive queries at
624-528: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=NS&oldid=1227265782 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages ns">ns The requested page title contains unsupported characters : ">". Return to Main Page . Name server An example of
650-760: The main public transport railway company in the Netherlands Norfolk Southern Railway , a major Class I railroad in the United States, owned by the Norfolk Southern Corporation Norfolk Southern Railway (1942–1982) , the final name of a railroad running in Virginia and North Carolina before its acquisition by the Southern Railway in 1974 Government and politics [ edit ] Nasjonal Samling ,
676-475: The parent zone as glue records ; otherwise, the delegation consists of the list of NS records for that zone. A name server indicates that its response is authoritative by setting the Authoritative Answer ( AA ) bit in the response to a query on a name for which it is authoritative. Name servers providing answers for which they are not authoritative (for example, name servers for parent zones) do not set
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