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A '''3char''' is a [[domain name]] or [[AOL Instant Messenger]] (AIM) screen name with only three characters.<br />
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Since AIM screen name must start with a letter, there are only 33,696 valid three-character screen names (<math>26*36*36</math>), and 46,656 valid three-character second-level domain names per [[top-level domain]] (<math>36^3</math>).<br />
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==AIM screen names==<br />
Since all of these screen names were registered in the middle 1990s, mostly by [[America Online]] members, these are a form of online "rarity", sought after by youths, [[Hacker (programmer subculture)|hackers]], or anyone wanting their screen name to appear impressive. 3chars are regularly sold or traded online. Many people have cracked the [[password]] of 3char accounts through [[brute-force search]] or using AOL Exploits and hacks to obtain the accounts.<br />
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Additionally, complex methods of screen name theft have been developed over time to allow AOL [[Security cracking|crackers]] to gain unauthorized access to rare screen names, including 3chars. In late 2000, one AOL cracker reportedly developed software which used an AOL security glitch [http://www.theregister.co.uk/2000/11/29/aol_instant_msgr_accounts_easily/] to gain access to all three-character screen names vulnerable to that security issue, effectively bringing many thousands of these screen names under his control. This resulted in numerous long-time users losing their accounts, and began a cottage industry of screen name barter and sale.<br />
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== See also==<br />
*[[Inside-AOL.com]]<br />
*[[AOL]]<br />
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== External links ==<br />
* [http://www.wired.com/news/infostructure/1,57753-0.html ''Wired News''] Hackers Run Wild & Free on AOL, by Christopher Null<br />
* [http://www.theregister.co.uk/2000/11/29/aol_instant_msgr_accounts_easily/ ''The Register''] AOL Instant Msgr accounts easily hijacked<br />
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[[Category:Instant messaging]]<br />
[[Category:Domain name system]]<br />
[[Category:AOL]]</div>en>Tomruen