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RJ45 (Registered Jack 45) may refer to:

  • RJ45 (telecommunications), a connector standardized as the 8P8C modular connector (and the similar RJ45S with a keyed 8P2C) often used with CAT5 and CAT6 cables
  • RJ45 (computers), an unkeyed 8P8C modular connector used for Ethernet computer network cables (incorrectly referred to as RJ45)