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Encyclopedia > Localhost

In computing, within the context of a TCP/IP network such as the Internet, localhost is a reserved name meaning this computer. It is used where one would otherwise specify the name or address of a computer in the network. For example, directing a web browser to http://localhost will display the home page of the web site (if any) being served from the computer running the browser. A common basic test of the TCP/IP protocol stack on a machine is to enter this command at a shell prompt: A loopback is a communications channel with only one endpoint. ... This article or section does not cite any references or sources. ... It has been suggested that Crash counting be merged into this article or section. ... A computer program is a collection of instructions that describe a task, or set of tasks, to be carried out by a computer. ... == [[Bold textLocalhost lets you access a world-wide file system through your web browser. ... RAM (Random Access Memory) Look up computing in Wiktionary, the free dictionary. ... The Internet protocol suite is the set of communications protocols that implement the protocol stack on which the Internet runs. ... It has been suggested that this article or section be merged with communications protocol. ...

ping localhost

localhost always translates to the loopback IP address in IPv4, or ::1 in IPv6 (see below). A loopback is a communications channel with only one endpoint. ... This article or section does not cite any references or sources. ... Internet Protocol version 4 is the fourth iteration of the Internet Protocol (IP) and it is the first version of the protocol to be widely deployed. ... Internet Protocol version 6 (IPv6) is a network layer protocol for packet-switched internetworks. ...

Being able to communicate with one's local machine as though it were a remote machine is useful for the purposes of testing, and also to contact normally remote services (such as game servers) that happen to reside on the local machine. A computer game is a game composed of a computer-controlled virtual universe that players interact with in order to achieve a defined goal or set of goals. ... This article does not cite any references or sources. ...


Related specification of IETF

IETF document "Special-Use IPv4 Addresses" (RFC 3330) describes the as a reserved IPv4 address block for loopback. The Internet Engineering Task Force (IETF) develops and promotes Internet standards, cooperating closely with the W3C and ISO/IEC standard bodies; and dealing in particular with standards of the TCP/IP and Internet protocol suite. ...

This address block will not be allocated or assigned to any organization or ISP. Any packet with an address of this address block '' cannot appear outside of a host system. Within a host system, the loopback interface is normally assigned the address '' with subnetwork mask ''. This makes the routing table of the local system set with a routing entry of '', so that packets destined to any address of this '' would be routed internally within the local system. A loopback is a communications channel with only one endpoint. ... The word subnetwork has two related meanings. ... In computer networking a routing table is an electronic table (file) or database type object that is stored in a router or a networked computer. ...

On the other hand, only one IPv6 address ::1/128 (that is to say, the address with a one at its least significant bit and zero otherwise) is specified as loopback address in IPv6 addressing architecture specification of RFC 3513.

In RFC 3513, the specification says: "The loopback address must not be used as the source address in IPv6 packets that are sent outside of a single node. An IPv6 packet with a destination address of loopback must never be sent outside of a single node and must never be forwarded by an IPv6 router. A packet received on an interface with destination address of loopback must be dropped."


  • An urban legend involving is often circulated among the more technical computer related forums on the web. The story often involves an antagonist often referred to as “The World’s Worst Computer Hacker”. The story generally involves the Hacker hacking himself when tricked into using as the IP address to hack into.[1][2]
  • In the same vein, is often used as an IP address given to inexperienced computer users as a practical joke. Another story involves a user who, after finding that pinging pings his computer, tells all of his associates that his IP is

An urban legend or urban myth is similar to a modern folklore consisting of stories often thought to be factual by those circulating them. ... This article is about computer hacking. ... This article or section does not cite any references or sources. ... ThinkGeek is an electronic commerce company based in Fairfax, VA as part of the Open Source Technology Group. ... T-Shirt A T-shirt (or tee shirt) is a shirt with short or long sleeves, a round neck, put on over the head, without pockets. ...


  1. ^ Elch. "M4tr1x-Trilogie", stophiphop.de, 2005-04-06. Retrieved on 2007-02-23. 
  2. ^ Template:Cite site

Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... February 23 is the 54th day of the year in the Gregorian calendar. ...

External links

  • RFC 3330: "Special-Use IPv4 Addresses"
  • RFC 3513: "Internet Protocol Version 6 (IPv6) Addressing Architecture"
  • Your Loopback (Port 80)

  Results from FactBites:
.localhost at AllExperts (129 words)
.localhost is a reserved top-level domain not intended for real use in the global DNS.
Its reservation is intended to avoid confusion with the common localhost.
Also, the ".localhost" TLD has traditionally been statically defined in host DNS implementations as having an A record pointing to the loop back IP address and is reserved for such use.
Localhost - Wikipedia, the free encyclopedia (450 words)
The initial letter is capitalized due to technical restrictions.
In computing the term localhost refers to the location of the currently used system.
It is a loopback device which is assigned the IP address in IPv4, or ::1 in IPv6, which can be used by TCP/IP applications to talk to themselves if this is needed.
  More results at FactBites »



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