Low Orbit Ion Cannon - Wikipedia

Low Orbit Ion Cannon (LOIC) is an open-source network stress testing and denial-of-service attack application written in C#. LOIC was initially developed by Praetox Technologies, however it was later released into the public domain[2] and is currently available on several open-source platforms.[3][4] LOIC performs a DoS attack (or, when used by multiple individuals, a DDoS attack) on a target site

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The name is derived from a fictional weapon in the Command & Conquer series of video games.