258:, a software client on an end-user PC requests a file, and portions of the requested file residing on peer machines are sent to the client, and then reassembled into a full copy of the requested file. The "tracker" server keeps track of where file copies reside on peer machines, which ones are available at time of the client request, and helps coordinate efficient transmission and reassembly of the copied file. Clients that have already begun downloading a file communicate with the tracker periodically to negotiate faster file transfer with new peers, and provide network performance statistics; however, after the initial peer-to-peer file download is started, peer-to-peer communication can continue without the connection to a tracker.
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Multi-tracker torrents contain multiple trackers in a single torrent file. This provides redundancy in the case that one tracker fails, the other trackers can continue to maintain the swarm for the torrent. One disadvantage to this is that it becomes possible to have multiple unconnected swarms for a
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Free distribution. Copyright holders may choose to allow free distribution of their works. Dedicated copyright licenses—usable by anyone who wants to upload their own material—are available for that purpose. Such licenses are often used in situations with large numbers of copyright holders, like in
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Trackers are the primary reason for a damaged BitTorrent "swarm". (Other reasons are mostly related to damaged or hacked clients uploading corrupt data.) The reliability of trackers has been improved through two main innovations in the BitTorrent protocol.
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single torrent where some users can connect to one specific tracker while being unable to connect to another. This can create a disjoint set which can impede the efficiency of a torrent to transfer the files it describes. Additional extensions such as
423:(DHT) method. An alternative and incompatible DHT system, known as Mainline DHT, was developed simultaneously and later adopted by the BitTorrent (Mainline), ÎĽTorrent, Transmission, rTorrent, KTorrent, BitComet, and Deluge clients.
461:(PeX) to gather peers in addition to trackers and DHT. Peer exchange checks with known peers to see if they know of any other peers. With the 3.0.5.0 release of Vuze, all major BitTorrent clients now have compatible peer exchange.
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addresses, though, are 128 bits long, and as such, the "compact" would break IPv6 support. To handle that situation clients and trackers must either avoid using compact announces over IPv6 or implement BEP 07
306:, in which active and contributing members are given the ability to grant a new user permission to register at the site, or a new user goes through an interview process.
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is a BitTorrent tracker that restricts use by requiring users to register with the site. The method for controlling registration used among many private trackers is an
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regularly collects and publishes classical cultural works after their copyright has expired (which depends on the country in which the work was previously published).
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Public or open trackers can be used by anyone by adding the tracker address to an existing torrent, or they can be used by any newly created torrent, like
446:. As of version 3.0.5.0, Vuze also supports Mainline DHT in addition to its own distributed database through use of an optional application plugin
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based tracker protocol is the "compact" flag. This flag, as defined in BEP 23, specifies that the tracker can compact the response by encoding
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provisions in copyright law, which allow people the right to access and use certain classes of copyrighted material without breach of the law.
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protocol to discover peers without trackers; however, trackers are still often included with torrents to improve the speed of peer discovery.
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There are also experiments that legally sell content that is distributed over BitTorrent using a "secure" tracker system.
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There are several circumstances under which it is legal to distribute copyrighted material or parts thereof.
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and therefore not (or no longer) subject to copyright law can also be legally distributed. For instance,
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operated one of the most popular public trackers until disabling it in 2009 due to legal trouble.
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is an open source, commercially supported tracker with integrated web-based management portal.
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419:(formerly Azureus) was the first BitTorrent client to implement such a system through the
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mitigate this effect by rapidly merging otherwise disjoint graphs of peers.
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580:"Understanding Peer Exchange in BitTorrent Systems - New York University"
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is an open source BitTorrent client with a built-in tracker support.
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Di, Wu; Dhungel, Prithula; Hei, Xiaojun; Zhang, Chao; Ross, Keith.
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from Dirk
Engling powered one of the biggest BitTorrent trackers,
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in text, audio, video or image format; or software licenses for
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itself can be distributed via BitTorrent for the same reason.
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605:"Trading BitTorrent Tracker Invites, Commodity or Curse?"
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Current versions of the official BitTorrent client,
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may be too technical for most readers to understand
90:. Unsourced material may be challenged and removed.
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477:addresses as a set of 4 bytes (32 bits).
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438:and BitSpirit all share compatibility with
53:Learn how and when to remove these messages
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261:Modern BitTorrent clients may implement a
243:that assists in the communication between
540:Comparison of BitTorrent tracker software
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223:Learn how and when to remove this message
205:Learn how and when to remove this message
189:, without removing the technical details.
150:Learn how and when to remove this message
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442:. Both DHT implementations are based on
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327:Limitations and exceptions to copyright
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363:Public domain. Works that are in the
336:online communities. For example, the
187:make it understandable to non-experts
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638:"Tracker Returns Compact Peer Lists"
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88:adding citations to reliable sources
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374:Fair use. Some countries also have
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617:from the original on 19 June 2013
34:This article has multiple issues.
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670:from the original on 2017-05-15
644:from the original on 2010-02-11
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75:needs additional citations for
42:or discuss these issues on the
1228:BitTorrent Open Source License
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603:Jones, Ben (15 January 2008).
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545:Comparison of BitTorrent sites
1:
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386:Improving torrent reliability
320:
1233:Glossary of BitTorrent terms
469:One of the options for this
316:Legal issues with BitTorrent
7:
1302:Application layer protocols
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492:BitTorrent tracker software
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273:Public vs private trackers
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256:peer-to-peer file sharing
664:"IPv6 Tracker Extension"
791:Distributed hash tables
662:Hazel, Greg; Norberg.
555:Distributed hash table
421:distributed hash table
395:Multi-tracker torrents
263:distributed hash table
909:Free Download Manager
530:BitTorrent (protocol)
239:is a special type of
811:Local Peer Discovery
412:Trackerless torrents
350:Open-source software
99:"BitTorrent tracker"
84:improve this article
1312:Servers (computing)
821:Protocol encryption
342:free cultural works
340:license family for
249:BitTorrent protocol
16:File-sharing server
1297:BitTorrent tracker
1162:Oink's Pink Palace
1001:WebTorrent Desktop
997:(formerly Azureus)
448:MainlineDHT Plugin
237:BitTorrent tracker
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890:(original client)
636:Harrison, David.
535:BitTorrent client
369:Project Gutenberg
304:invitation system
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453:Most BitTorrent
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1085:Tamil Rockers
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1080:Nyaa Torrents
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786:Broadcatching
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402:Peer exchange
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365:public domain
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346:Free Software
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175:This article
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101: –
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95:Find sources:
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73:This article
71:
67:
62:
61:
56:
54:
47:
46:
41:
40:
35:
30:
21:
20:
1248:TorrentFreak
1238:Popcorn Time
1172:Suprnova.org
1132:ExtraTorrent
985:Transmission
836:Torrent file
830:
765:Ashwin Navin
760:Eric Klinker
672:. Retrieved
657:
646:. Retrieved
631:
619:. Retrieved
610:TorrentFreak
608:
598:
586:. Retrieved
573:
511:
505:
495:
468:
465:IPv6 support
452:
440:Mainline DHT
436:Transmission
425:
415:
398:
389:
381:
356:and others.
330:
310:Legal issues
299:
297:
281:
260:
253:
236:
234:
219:
201:
192:
176:
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137:
127:
120:
113:
106:
94:
82:Please help
77:verification
74:
50:
43:
37:
36:Please help
33:
1152:LokiTorrent
1038:PeerTracker
1033:opentracker
965:qBittorrent
879:usage share
588:22 December
560:UDP tracker
507:qBittorrent
497:opentracker
354:BSD License
195:August 2012
1307:BitTorrent
1291:Categories
1207:YouTorrent
1187:TorrentSpy
1118:comparison
1100:YggTorrent
1051:comparison
1019:comparison
939:libtorrent
888:BitTorrent
874:comparison
861:WebTorrent
774:Technology
755:Ross Cohen
750:Bram Cohen
734:Vuze, Inc.
715:BitTorrent
674:2017-02-28
648:2017-02-28
621:23 October
566:References
550:Bram Cohen
513:BitTorious
321:Legal uses
247:using the
140:March 2009
110:newspapers
39:improve it
1243:Slyck.com
941:(library)
919:FrostWire
722:Companies
503:tracker.
457:also use
358:Knowledge
352:like the
45:talk page
1266:Category
1192:Torrentz
1157:Mininova
1127:BTJunkie
1070:Demonoid
975:Shareaza
970:rTorrent
960:MLDonkey
950:µTorrent
945:LimeWire
934:KTorrent
929:Go!Zilla
924:Getright
914:Flashget
894:BitComet
781:Glossary
668:Archived
642:Archived
615:Archived
519:See also
486:Software
444:Kademlia
432:BitComet
428:ÎĽTorrent
376:fair use
265:and the
1276:Commons
1197:What.CD
1142:isoHunt
990:Tribler
899:BitLord
870:Clients
831:Tracker
525:ArenaBG
455:clients
181:Please
124:scholar
1065:BTDigg
1006:Xunlei
980:Tixati
904:Deluge
856:WebRTC
743:People
241:server
126:
119:
112:
105:
97:
1167:RARBG
1075:etree
1060:1337x
806:index
583:(PDF)
245:peers
131:JSTOR
117:books
1223:aXXo
1202:YIFY
1177:t411
1137:EZTV
995:Vuze
955:Miro
623:2010
590:2022
479:IPv6
475:IPv4
471:HTTP
417:Vuze
404:and
103:news
851:µTP
846:UDP
841:TCP
801:I2P
796:DNA
406:DHT
254:In
185:to
86:by
1293::
666:.
640:.
613:.
607:.
434:,
430:,
348:/
298:A
286:.
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235:A
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128:·
121:·
114:·
107:·
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51:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
