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Client software is available for every major operating system that supports Internet access. Main issue with all other mobile chat room apps is that they require to access your contacts, galary and other private resources. The Telecommunications Illustrated Dictionary 2nd ed. These search engines are usually implemented as bots and dedicated to a particular channel or group of associated channels. Many daemons and networks have added extra modes or modified the behavior of modes in the above list. IRC has changed much over its life on the Internet.

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For the latter purpose, the Undernet implemented timestamps, new routing and offered the CService—a program that allowed users to register channels and then attempted to protect them from troublemakers. On August 15, the new user count record was set to 57 users. In fact, software implementation varied significantly from one network to the other, each network implementing their own policies and standards in their own code bases.

During the summer of , the Undernet was itself forked. The new network was called DALnet named after its founder: One of the more significant changes in DALnet was use of longer nicknames the original ircd limit being 9 letters. Lined nicknames nicknames that cannot be used i.

Lines ban of one person or an entire domain from a server or the entire network , IRCop only communications: Much of DALnet's new functions were written in early by Brian "Morpher" Smith and allow users to own nicknames, control channels, send memos, and more. In July , after months of flame wars and discussions on the mailing list, there was yet another split due to disagreement in how the development of the ircd should evolve. Most notably, the "european" most of those servers were in Europe side that later named itself IRCnet argued for nick and channel delays where the EFnet side argued for timestamps.

EFnet has since as of August grown and passed the number of users it had then. Certain networks like Freenode have not followed the overall trend and have more than quadrupled in size during the same period. As of , a new standardization effort is under way under a working group called IRCv3, which focuses on more advanced client features like instant notifications, better history support and improved security.

Most IRC servers do not require users to register an account but a nick nickname is required before being connected. The protocol specified that characters were 8-bit but did not specify the character encoding the text was supposed to use. All client-to-server IRC protocols in use today are descended from the protocol implemented in the irc2. Since RFC was published, the new features in the irc2. Although many specifications on the IRC protocol have been published, there is no official specification, as the protocol remains dynamic.

Virtually no clients and very few servers rely strictly on the above RFCs as a reference. The standard structure of a network of IRC servers is a tree. This architecture has a number of problems. A misbehaving or malicious server can cause major damage to the network [28] and any changes in structure, whether intentional or a result of conditions on the underlying network, require a net-split and net-join.

Adding a server to a large network means a large background bandwidth load on the network and a large memory load on the server. Once established however, each message to multiple recipients is delivered in a fashion similar to multicast , meaning each message travels a network link exactly once.

IRC can thus be used to facilitate communication between people within the local area network internal communication. IRC has a line-based structure. Clients send single-line messages to the server, [33] receive replies to those messages [34] and receive copies of some messages sent by other clients. Depending on the command, these may either be handled entirely by the client, or generally for commands the client does not recognize passed directly to the server, possibly with some modification.

Due to the nature of the protocol, automated systems cannot always correctly pair a sent command with its reply with full reliability and are subject to guessing. The basic means of communicating to a group of users in an established IRC session is through a channel. Messages sent to the joined channels are then relayed to all other users. Users and channels may have modes that are represented by single case-sensitive letters [42] and are set using the MODE command.

Some but not all channel modes take parameters and some channel modes apply to a user on a channel or add or remove a mask e. In order to correctly parse incoming mode messages and track channel state the client must know which mode is of which type and for the modes that apply to a user on a channel which symbol goes with which letter.

In early implementations of IRC this had to be hard-coded in the client but there is now a de facto standard extension to the protocol called ISUPPORT that sends this information to the client at connect time using numeric There is a small design fault in IRC regarding modes that apply to users on channels: Workarounds for this are possible on both the client and server side but none are widely implemented.

Many daemons and networks have added extra modes or modified the behavior of modes in the above list. On most networks, an operator can:. There are also users who maintain elevated rights on their local server, or the entire network; these are called IRC operators, [54] sometimes shortened to IRCops or Opers not to be confused with channel operators. RFC [54] claims that IRC operators are "a necessary evil" to keep clean state of the network, and as such they need to be able to disconnect and reconnect servers.

Additionally, to prevent malicious users or even harmful automated programs from entering IRC, IRC operators are usually allowed to disconnect clients and completely ban IP addresses or complete subnets. Networks that carry services Nickserv et al.

Further privileged rights may include overriding channel bans being able to join channels they would not be allowed to join, if they were not opered , being able to op themselves on channels where they would not be able without being opered, being auto-opped on channels always and so forth. The format of a hostmask is nick! The hostmask looks similar to, but should not be confused with an e-mail address.

The nick part is the nickname chosen by the user and may be changed while connected. The user part is the username reported by ident on the client. The host part is the hostname the client is connecting from. If the IP address of the client cannot be resolved to a valid hostname by the server, it is used instead of the hostname. This hashes a client IP address or masks part of a client's hostname, making it unreadable to users other than IRCops.

Users may also have the option of requesting a "virtual host" or "vhost" , to be displayed in the hostmask to allow further anonymity. Some IRC networks such as Freenode use these as "cloaks" to indicate that a user is affiliated with a group or project.

Issues in the original design of IRC were the amount of shared state data [60] [61] being a limitation on its scalability, [62] the absence of unique user identifications leading to the nickname collision problem, [63] lack of protection from netsplits by means of cyclic routing, [64] [65] the trade-off in scalability for the sake of real-time user presence information, [66] protocol weaknesses providing a platform for abuse, [67] no transparent and optimizable message passing, [68] and no encryption.

Because of this, careful security policy is necessary to ensure that an IRC network is not susceptible to an attack such as a takeover war. IRC networks may also K-line or G-line users or servers that have a harming effect. This helps stop the use of packet sniffer programs to obtain the passwords of IRC users, but has little use beyond this scope due to the public nature of IRC channels.

SSL connections require both client and server support that may require the user to install SSL binaries and IRC client specific patches or modules on their computers. Both methods exist to solve the problem of denial-of-service attacks , but take very different approaches.

The problem with the original IRC protocol as implemented was that when two servers split and rejoined, the two sides of the network would simply merge their channels. If a user could join on a "split" server, where a channel that existed on the other side of the network was empty, and gain operator status, they would become a channel operator of the "combined" channel after the netsplit ended; if a user took a nickname that existed on the other side of the network, the server would kill both users when rejoining i.

This was often abused to "mass-kill" all users on a channel, thus creating "opless" channels where no operators were present to deal with abuse.

Apart from causing problems within IRC, this encouraged people to conduct denial of service attacks against IRC servers in order to cause netsplits , which they would then abuse. After a user signs off and the nickname becomes available, or a channel ceases to exist because all its users parted as often happens during a netsplit , the server will not allow any user to use that nickname or join that channel, until a certain period of time the delay has passed.

The idea behind this is that even if a netsplit occurs, it is useless to an abuser because they cannot take the nickname or gain operator status on a channel, and thus no collision of a nickname or 'merging' of a channel can occur. To some extent, this inconveniences legitimate users, who might be forced to briefly use a different name after rejoining appending an underscore is popular. The alternative, the timestamp or TS protocol, takes a different approach.

When a netsplit occurs, two users on each side are free to use the same nickname or channel, but when the two sides are joined, only one can survive. In the case of nicknames, the newer user, according to their TS, is killed; when a channel collides, the members users on the channel are merged, but the channel operators on the "losing" side of the split lose their channel operator status.

Under the original TS protocols, for example, there was no protection against users setting bans or other modes in the losing channel that would then be merged when the split rejoined, even though the users who had set those modes lost their channel operator status.

Most networks today use the timestamping approach. If two clients with the same nickname join from different sides of a netsplit "nick collision" , the first server to see this collision will force both clients to change their nick to their UID, thus saving both clients from being disconnected.

On IRCnet, the nickname will also be locked for some time ND to prevent both clients from changing back to the original nickname, thus colliding again. There are thousands of running IRC networks in the world. They run various implementations of IRC servers , and are administered by various groups of IRC operators , but the protocol exposed to IRC users is very similar, and all IRC networks can be accessed by the same client software, although there might be slight incompatibilities and limited functionality due to the differing server software implementations.

The largest IRC networks have traditionally been grouped as the "Big Four" [72] [73] [74] [75] — a designation for networks that top the statistics. The Big Four networks change periodically, but due to the community nature of IRC there are a large number of other networks for users to choose from.

Historically the "Big Four" were: IRC reached 6 million simultaneous users in and 10 million users in Today, the top IRC networks have around k users connected at peak hours. Per the specification, the usual hash symbol will be prepended to channel names that begin with an alphanumeric character—allowing it to be omitted.

Some implementations for example, mIRC will do so unconditionally resulting in a usually unintended extra for example, channel , if included in the URL. Some implementations allow multiple channels to be specified, separated by commas.

Client software exists for various operating systems or software packages, as well as web-based or inside games. On Windows, mIRC is one of the most popular clients. Some programs which are extensible through plug-ins also serve as platforms for IRC clients.

Therefore, any platform that can run Emacs can run ERC. A number of web browsers have built-in IRC clients, such as Opera version Ustream 's chat interface is IRC with custom authentication [85] as well as twitch.

A typical use of bots in IRC is to provide IRC services or specific functionality within a channel such as to host a chat-based game or provide notifications of external events.

However some IRC bots are used to launch malicious attacks such as denial of service, spamming, or exploitation. A program that runs as a daemon on a server and functions as a persistent proxy is known as a BNC or bouncer. The purpose is to maintain a connection to an IRC server, acting as a relay between the server and client, or simply to act as a proxy. Furthermore, as a way of obtaining a bouncer-like effect, an IRC client typically text-based , for example Irssi may be run on an always-on server to which the user connects via ssh.

To keep the IRC client from quitting when the ssh connection closes, the client can be run inside a terminal multiplexer such as GNU Screen or tmux , thus staying connected to the IRC network s constantly and able to log conversation in channels that the user is interested in, or to maintain a channel's presence on the network. Modelled after this setup, in an IRC client following the client-server model, called Smuxi , was launched.

There are numerous search engines available to aid the user in finding what they are looking for on IRC. It is responsible for crawling IRC servers to index the information being sent across them.

The information that is indexed usually consists solely of channel text text that is publicly displayed in public channels. Join our Arab chat room and English chat room as well. Online dating calture is not vary popular in Pakistan. Most of the people still consider online dating apps as a bad thing in Pakistan. The only option left for Pakistani boys and girls are to meet new friends in online chat rooms and make new friends.

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