Internet TCP port 1337 is commonly associated with the WASTE protocol, a decentralized, encrypted, peer-to-peer communication protocol. It is also used by the game League of Legends for PVP.net connections. Additionally, it is often used in hacker culture, where "1337" stands for "leet", or "elite". However, it's important to note that this port is not officially registered for these uses with the Internet Assigned Numbers Authority (IANA).
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