Internet TCP port 3129 is commonly used by the Proxy Master service, a type of software that allows users to anonymously browse the internet. This port is also utilized by the DProxy protocol, which is a lightweight, open-source DNS proxy server. Additionally, some instances of the Squid caching proxy server have been known to use port 3129. However, it's important to note that the usage of this port can vary greatly depending on the specific network configuration and security policies in place.
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