Domain Name System

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domain name system

[dō‚mān ′nām ‚sis·təm]
(computer science)
Abbreviated DNS.
A system used on the Internet to map the easily remembered names of host computers (domain names) to their respective Internet Protocol (IP) numbers.
A software database program that converts domain names to Internet Protocol addresses, and vice versa.

Domain Name System

(DNS) A general-purpose distributed, replicated, data query service chiefly used on Internet for translating hostnames into Internet addresses. Also, the style of hostname used on the Internet, though such a name is properly called a fully qualified domain name. DNS can be configured to use a sequence of name servers, based on the domains in the name being looked for, until a match is found.

The name resolution client (e.g. Unix's gethostbyname() library function) can be configured to search for host information in the following order: first in the local hosts file, second in NIS and third in DNS. This sequencing of Naming Services is sometimes called "name service switching". Under Solaris is configured in the file /etc/nsswitch.conf.

DNS can be queried interactively using the command nslookup. It is defined in STD 13, RFC 1034, RFC 1035, RFC 1591.

BIND is a common DNS server.

Info from Virtual Office, Inc..
References in periodicals archive ?
Rapid Insight checks that information against intelligence found in over a dozen sources, including: Alexa, DNS Lookup, IP Geolocation, Google Custom Search, Google Safe Browsing, IID ActiveTrust, Passive DNS, Reverse DNS, Reverse WHOIS via DomainTools, Virus Total and WHOIS via DomainTools.
As Web applications become more complex and increasingly rely on data pulled from numerous domains, the DNS lookup process of resolving a host name to an IP address is often an overlooked source of latency.
Brown gave the example of Network Protector, one of the launch apps for the store, that screens DNS lookup requests for sites known to be sources of malware.
Tests include: Network Status to ensure that you are connected to a network, Internet Access to assess the quality of your Internet connection, DNS Lookup to determine if you can reach Domain Name Servers, Cloud Services to check if you can connect to standard web services and CDN Services to measure your download speed.
The access point does a DNS lookup to find the enterprise Meru WLAN controller.
When users make a request which requires a DNS lookup (in effect, virtually any request that uses the Internet), such programs send a request to the DNS resolver built into their operating system.
Reverse DNS lookup runs DNS queries on the IP addresses of incoming email to determine if the identified host name matches an actual host name for the sender's IP addresses.
Additional filters include real time black/white list lookup, DNS lookup, sender/domain filtering, rules-based message body scanning and subject line filtering.
Spam-identifying capabilities have been enhanced with six spam prevention methods: real-time blacklisting, DNS lookup, anti-relay, antispoofing, cookie blocking, and keyword filtering.
Other features include the ability to send links by email, merge duplicate URLs, and to launch ping, traceroute, or DNS lookup commands on a website's domain name from a right-click popup menu.
Users of this free DNS lookup service are invited to discuss any questions and recommendations they may have.