XDCC
XDCC is a computer file sharing method which uses the Internet Relay Chat network as a host service.
History
Limitations in the original DCC protocol prevented the transfers of very large files, or groups of files. XDCC was developed to allow batching of files together, and requesting/sending those files to others.XDCC was initially a script written in 1994 for ircII by Xabi. This script extends the ircII DCC command. Now XDCC refers to IRC bots running file sharing programs in general. XDCC bots serve one or more usually large files for download using the DCC protocol. XDCC is commonly employed in distributing illegal content, such as warez releases of software, music, and movies. In 2025, some channels had over 100,000 such files. Since 2001, mIRC scripts such as Polaris have integrated XDCC server software. Defunct XDCC search engines include and .
Features
Unlike peer-to-peer transfers, XDCC servers are often hosted on connections with very high upstream bandwidth, sometimes in excess of 100 Mbit. Often FTP servers are also running on the XDCC servers to facilitate uploading of materials to them. Many XDCC servers run on security compromised computers.Usage
A stand-alone IRC client such as mIRC or HexChat is required to use the DCC protocol. In order to receive files, the software has to be properly configured, otherwise downloads will be rejected by the software.To use XDCC, one can send a private message or send a CTCP command to a bot, using an IRC client. The user can ask a bot what files it has by private messaging "xdcc list" to the bot. However, this feature is often disabled as to not attract too much attention. When a user wants to download a packet or file from a bot, the user would type something such as "xdcc send #
Addons exist, such as XDCCKlipper which listen to adverts listed in a channel by the bots and save them to a separate window to facilitate easier browsing and allow users to view the status of a bot.