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RJ45 (Registered Jack 45) may refer to:

  • RJ45 (telecommunications), a colloquial and unofficial name referring to any of a number of varieties of unkeyed 8-position, 8-contact telecommunications jacks.
  • RJ45 (computers), an unkeyed 8-position, 8-contact modular plug (incorrectly referred to as RJ45) used primarily on patch cables for Ethernet and other computing and telecommunications interconnections.