Internet UDP port 81 is often used by web applications and services that require an alternative to the standard HTTP port 80. For example, the Torpark browser, which is used for anonymous internet browsing, utilizes this port. Additionally, some Internet of Things (IoT) devices, such as certain models of IP cameras, also use port 81. However, it's important to note that usage of this port can vary widely depending on the specific software or system configuration.
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