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.
31-748: (Redirected from ANS ) [REDACTED] Look up Ans or ANS in Wiktionary, the free dictionary. Ans or ANS or variation , may refer to: Places [ edit ] Ans, Belgium , a municipality in Belgium Ans, Denmark , a village in Denmark Angus, Scotland , UK; a council area by its Chapman code Ainsdale railway station , England, UK (by station code ANS ) Andahuaylas Airport , Peru (by IATA airport code ANS ) People [ edit ] Ans (given name) ,
62-504: A Dutch feminine given name Anna Nicole Smith , American model and actress Organizations [ edit ] Academy of Natural Sciences of Philadelphia , Pennsylvania, United States Astronomical Netherlands Satellite , a Dutch satellite American Name Society American Nuclear Society American Numismatic Society , formerly the American Numismatic and Archaeological Society ANS Group of Companies ,
93-733: A Dutch satellite American Name Society American Nuclear Society American Numismatic Society , formerly the American Numismatic and Archaeological Society ANS Group of Companies , a news organization in Azerbaijan Armée Nationale Sihanoukiste [ ru ] , a Cambodian resistance group; see Coalition Government of Democratic Kampuchea Audubon Naturalist Society , an American environmental organization Chemistry and biology [ edit ] Adrenergic nervous system , adrenaline and noradrenaline neurotransmitters distribution in human body 8-Anilinonaphthalene-1-sulfonic acid ,
124-518: A Dutch student magazine Akademia Nauk Stosowanych , a vocational university in Nowy Targ, Poland See also [ edit ] [REDACTED] Search for "ans" on Misplaced Pages. All pages with titles containing ans All pages with titles beginning with Ans All pages with titles beginning with ANS AN (disambiguation) Answer (disambiguation) , for which "Ans." may be an abbreviation Topics referred to by
155-461: A Dutch student magazine Akademia Nauk Stosowanych , a vocational university in Nowy Targ, Poland See also [ edit ] [REDACTED] Search for "ans" on Misplaced Pages. All pages with titles containing ans All pages with titles beginning with Ans All pages with titles beginning with ANS AN (disambiguation) Answer (disambiguation) , for which "Ans." may be an abbreviation Topics referred to by
186-455: A council area by its Chapman code Ainsdale railway station , England, UK (by station code ANS ) Andahuaylas Airport , Peru (by IATA airport code ANS ) People [ edit ] Ans (given name) , a Dutch feminine given name Anna Nicole Smith , American model and actress Organizations [ edit ] Academy of Natural Sciences of Philadelphia , Pennsylvania, United States Astronomical Netherlands Satellite ,
217-508: A fluorescent chemical compound used as a molecular probe Anthocyanidin synthase , an enzyme in the leucocyanidin biosynthesis pathway Approximate number system , a hypothesized physiological basis for the sense of number Autonomic nervous system , part of the peripheral nervous system in the body L -Aspartate-nitro-succinate pathway for production of nitrite Technology [ edit ] .ans , an unofficial file extension for ANSI art Advanced Network and Services ,
248-508: A fluorescent chemical compound used as a molecular probe Anthocyanidin synthase , an enzyme in the leucocyanidin biosynthesis pathway Approximate number system , a hypothesized physiological basis for the sense of number Autonomic nervous system , part of the peripheral nervous system in the body L -Aspartate-nitro-succinate pathway for production of nitrite Technology [ edit ] .ans , an unofficial file extension for ANSI art Advanced Network and Services ,
279-511: A hierarchy of domains, administered by the respective registrars and domain name holders. A DNS name server 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
310-562: A late 1990's AIX based server machine from Apple Inc. Music [ edit ] ANS (album) , a box set from the British band Coil ANS synthesizer , a Russian photoelectric musical instrument Other uses [ edit ] Al Ansar FC , a Lebanese association football club Amman National School , in Amman, Jordan Ansvarlig selskap , a Norwegian personal responsibility company model Algemeen Nijmeegs Studentenblad ,
341-455: A late 1990's AIX based server machine from Apple Inc. Music [ edit ] ANS (album) , a box set from the British band Coil ANS synthesizer , a Russian photoelectric musical instrument Other uses [ edit ] Al Ansar FC , a Lebanese association football club Amman National School , in Amman, Jordan Ansvarlig selskap , a Norwegian personal responsibility company model Algemeen Nijmeegs Studentenblad ,
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#1732764887651372-438: A news organization in Azerbaijan Armée Nationale Sihanoukiste [ ru ] , a Cambodian resistance group; see Coalition Government of Democratic Kampuchea Audubon Naturalist Society , an American environmental organization Chemistry and biology [ edit ] Adrenergic nervous system , adrenaline and noradrenaline neurotransmitters distribution in human body 8-Anilinonaphthalene-1-sulfonic acid ,
403-678: A non-profit network service provider in the 1990s American National Standards, defined by the American National Standards Institute ans , a variable in calculators referring to the most recent answer ANS carriage control characters (or ASA control characters), for computer line printers Asymmetric numeral systems , coding in data compression Authoritative name server , a DNS server Artificial neural system, or Artificial neural network Air Navigation Services, as delivered by an Air Navigation Service Provider (ANSP) Apple Network Server ,
434-584: A non-profit network service provider in the 1990s American National Standards, defined by the American National Standards Institute ans , a variable in calculators referring to the most recent answer ANS carriage control characters (or ASA control characters), for computer line printers Asymmetric numeral systems , coding in data compression Authoritative name server , a DNS server Artificial neural system, or Artificial neural network Air Navigation Services, as delivered by an Air Navigation Service Provider (ANSP) Apple Network Server ,
465-607: A zone appears within that zone, the zone administrator provides IP addresses for that name server, which are installed in 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
496-477: A zone served by one or more authoritative name servers. The fully qualified domain names of the authoritative name servers of 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
527-433: Is different from Wikidata All article disambiguation pages All disambiguation pages Ans [REDACTED] Look up Ans or ANS in Wiktionary, the free dictionary. Ans or ANS or variation , may refer to: Places [ edit ] Ans, Belgium , a municipality in Belgium Ans, Denmark , a village in Denmark Angus, Scotland , UK;
558-531: Is different from Wikidata All article disambiguation pages All disambiguation pages Authoritative name server An example of 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
589-431: Is responsible (as specifically configured by its administrator). An authoritative name server can either be 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
620-446: 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
651-517: 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
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#1732764887651682-417: 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
713-494: The Domain Name System. The top hierarchy of the Domain Name System is served by the root name servers maintained by delegation by 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
744-501: 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
775-560: 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 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
806-480: 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
837-452: The list of name servers (typically at least two, for redundancy ) that are authoritative for the zone that contains 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
868-417: The primary server's database for a zone. Examples of such mechanisms include DNS zone transfers and file transfer protocols. DNS provides 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
899-442: The same term [REDACTED] This disambiguation page lists articles associated with the title Ans . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Ans&oldid=1249823766 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description
930-442: The same term [REDACTED] This disambiguation page lists articles associated with the title Ans . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Ans&oldid=1249823766 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description
961-465: 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 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