Amazon.com: DTech DB9 to RJ45 Serial Adapter RS232 Male to RJ-45 Female Ethernet Converter Compatible with Standard 9 Pin RS-232 Devices : Electronics
Vertiv Avocent RJ45-DB9(F), Serial Adapter Crossover Converter (ADB0036)
RJ45 to 9-pin female adapter,RJ45 to DB9pin male DB9 female RJ45 to RS232 network port to serial port DB9 pin - AliExpress
DB9 Female to RJ45 Modular Adapter
Amazon.com: DTech DB9 to RJ45 Serial Adapter RS232 Female to RJ-45 Female Ethernet Converter Compatible with Standard 9 Pin RS-232 Devices : Electronics
Adaptor and Dongles to convert RJ45 Serial to DB9 Serial