An IP stresser is an online tool that is used to attack a server or a website by overwhelming its resources with a flood of Internet traffic. It is often used to test the strength and resilience of a server or a network, but it can also be used maliciously to bring down a website or a service by denying legitimate users access.

IP stressers are often used by hackers to launch attacks on websites, but they can also be used by legitimate businesses and organizations to test their websites' performance. An IP stresser, also known as an IP booter or a network stresser, is a tool used to test the resilience and stability of a network or server by simulating high volumes of traffic.

It works by overwhelming the target's network infrastructure with an excessive amount of data packets, causing it to become overloaded and potentially crash.