Demonoid
Demonoid is a BitTorrent tracker and website that included file-sharing related discussion forums and a searchable index for the tracker. The site underwent intermittent periods of extended downtime due to the occasional need to move the server, generally caused by cancellation of ISP service due to local political pressure. There are reports of its founder Deimos passing away in September 2018 and the future of the site is currently uncertain.

Features and policies 
Demonoid features RSS with different feeds for each of its torrent categories and their sub-categories. It tracked and displayed users' upload/download ratios, but, except in its early years, took no action against users with low ratios (members who took more than they share). Demonoid previously banned users with low ratios, but stopped doing so due to the ratio system being inaccurate for some users, such as those with dynamic IP addresses. It was a semi-private tracker where registrations were periodically open.

Demonoid prohibits linking to torrents containing pornographic material and malicious software.

In addition to forums on the Demonoid web site, an IRC channel, #demonoid at P2P-Network, supports discussion among users.

History

Domain name changes 
On December 2, 2010, Demonoid changed its domain from .com to a .me address, to avoid US government seizure.

On April 27, 2012, Demonoid changed its domain to a .ph TLD, and started an open beta of the new site on Demonoid.me.

On June 15, 2012, Demonoid reverted to its previous .me domain, but returned to the .ph domain a week later.

The Demonoid website and tracker last went offline in July 2012 for a period of nearly two years, the longest hiatus ever. At the time it went offline, Demonoid was hosted by an ISP in Ukraine.  Subsequent signs of activity led to no new developments until March 29, 2014, when the site, once again, went online. The revived site now uses a remote server.

On May 7, 2013, d2, an unofficial website based on Demonoid's databases went live at d2.vu, with hosting provided by the U.S.-based service RamNode. Around November 2013, a website showing the Demonoid logo and saying "We will rebuild!" came online at the .com domain, and the .me and .ph domains began redirecting web traffic to it, indicating they are all under control of the same owner.

In January 2014, a tracker came online at the .com domain and provided service for the old torrents. On March 29, 2014, Demonoid came back online at the demonoid.ph domain. On December 3, 2014 domain name was changed to demonoid.pw.

There are no proxies or other alternatives available. There are some copycats around, but these are all fake.
“Users should be REALLY aware that there is no: .onion address, mirrors, alternative Demonoids and such. Especially to avoid demonoid.to,” according to torrentFreak.com. 

On February 17, 2019 an official statement was made stating that ownership of demonoid.pw was lost and to avoid visiting it.

In August 2019, Demonoid came back online at dnoid.to with registrations open intermittently.

Legal issues 
In a 2007 study, Slyck.com found twelve cease and desist letters to users of Demonoid.

On September 25, 2007, the Demonoid website, forums and trackers went offline. They came back four days later with the exception of the website, which came back the day after. Over the next few days, the website continued experiencing intermittent downtime until October 2, 2007. The explanation as widely speculated was that they had received a letter from a lawyer for the Canadian Recording Industry Association threatening legal action. Demonoid began blocking Canadian traffic, a strategy similar to that taken by isoHunt and TorrentSpy in blocking American traffic to avoid RIAA complaints. Visitors from Canadian-based IPs would be redirected to the downtime version of the website, which contained an explanation of the legal threats. However, it was still possible for Canadians to visit the website at that time using proxy servers. Additionally, while the website may have been blocked in Canada at the time, the tracker was still readily accepting Canadian IP addresses.

The threats are in spite of the open question of the legality of music file sharing in Canada. The CRIA has neither confirmed nor denied its involvement despite Demonoid's claims.

On November 9, 2007, the site again went offline, reportedly due to legal threats to their service provider from the Canadian Recording Industry Association. A placeholder page stated, "The CRIA threatened the company renting the servers to us, and because of this it is not possible to keep the site online. Sorry for the inconvenience and thanks for your understanding." According to the IRC channel, the trackers themselves were not affected. Six days later, the placeholder page was updated with a link to a new forum, unrelated to file sharing, for the community. On November 29, 2007, Deimos posted on that forum a problem preventing the site from coming back up:

The site then came back online on April 11, 2008. The homepage announced that the site had a new administrator, and that the old one (Deimos) had left for personal reasons.

Administration adjustment 
On April 10, 2008, Deimos stepped down as the administrator of Demonoid, citing a number of reasons and "distraction with real-world issues" as the cause. He also stated that he has "handed the reins over to a new administrator" – "a close friend of [his]", whom they trust completely and has the knowledge and time to take care of the site. Over the course of the next few days, RSS feeds for the site came back online and by April 16, 2008 a mass email was sent out to all Demonoid users informing that the site was "finally back online."

The official explanation stated:

Website downtime 
Demonoid experienced a prolonged downtime in late 2009 due to hardware failure. On September 14, 2009, Demonoid's torrent tracker went down after it was reported that they had experienced a number of hardware problems stemming from power outages. The tracker returned to service on November 5, and the main site returned on December 13.
A message was posted on the homepage stating that "We might have to shut down everything to fix and prevent further damage," and that it could be "days maybe, until we can change the power circuit." During the downtime that followed, several new messages appeared, mostly providing updates on the repair status and promising that the site would return soon. On November 4, 2009, the tracker, which communicates with a BitTorrent client, began responding to some torrents, and returned to full operation on November 17. The main site, however, did not become operational until December 13, 2009.

On April 26, 2010, Demonoid.com, started experiencing downtime or extreme slowness. A message was posted on the site that it was due to a denial-of-service attack, which has subsided as of July 2010. The site temporarily banned Taiwanese and Chinese IP ranges.

On July 24, 2012, Demonoid.me suffered another denial-of-service attack, bringing the site down for an indeterminate amount of time. The following week, its hosting provider, ColoCall, terminated its contract with Demonoid. An anonymous ColoCall source reported that the Ukrainian police had raided the hosting provider and seized Demonoid's data. However, according to the Ministry of Internal Affairs in Ukraine, the termination occurred without police intervention. No explanation has been given for the prolonged downtime, nor was there any word about the site's return until March 2014.

On November 12, 2012, demonoid.me began resolving to an IP address based in Hong Kong, where a tracker was operating. The tracker did not accept new torrents, but honored existing ones. However, the website and forums remained offline. The tracker went offline on December 15, 2012, first actively refusing all connections, and then becoming unreachable when demonoid.me's DNS servers went down.

In November 2013, demonoid.me and demonoid.ph started redirecting to demonoid.com, whose website began displaying a page that hints at a possible comeback of the site, with the message "We will rebuild! Coming back soon, please check back later. Thanks for your visit!!" along with a Bitcoin donation link. On January 9, 2014, a tracker came online at inferno.demonoid.com and quickly became one of the five busiest BitTorrent trackers on the Internet; in only a few hours, the tracker was coordinating the communication of 1.3 million people scattered across 388,321 torrent files.

In March 2014, after 20 months of downtime, the Demonoid BitTorrent tracker came back online. Former users were still able to use their login details, and most of the old torrents were still listed on the site.

In July 2018, Demonoid stopped working on all used domains. The issues are related to server-side problems. There are no backups or mirrors on the internet. 

On April 16th 2019, moderator phaze1G announced that Deimos had died in an accident in August.

Demonoid has started to come back online, run by new staff, under the domain dnoid.to during the month of July, 2019

d2 

During Demonoid's most recent downtime, an unofficial website based on Demonoid's databases was launched on May 7, 2013. The site went live at http://www.d2.vu/ with hosting provided by the U.S.-based service RamNode. d2's administrators stated, "No former admins have been involved with this rebranding or launch. This effort is independent and undertaken entirely for the benefit of the community."

Based on a Demonoid backup, d2 contained Demonoid's torrent and user databases. All previously registered Demonoid users were able to log in using their already existing Demonoid accounts, while new invite codes were being generated. Unlike Demonoid, d2 had no user forums, and to minimize legal risk, the site had no torrent tracker; all torrents instead used public trackers. RamNode eventually terminated d2's hosting and, in August 2013, d2.vu was hosted on a server in Sweden. d2 closed on March 30, 2014 when Demonoid went back up.