Connector: RJ45 Male to 9 Pin RS232 Female. Connect from a port on your laptop directly to a console port, No adapter required.
eBay
5000Mbps PCI-E to RJ45 Network Card Realtek 8126 1G/2.5G/5G RJ45 Interface Gigabit Ethernet PCI Express X1 X4 X8 X16 Adapter
Aliexpress UK
Universal colour coding on each pin. Complete with D-type cover and thumb screws. These adapters are used to run RS232 data over long distances (up to 100m) using UTP Cat 5e cable to bridge the gap.
eBay
Kebidu Micro USB To RJ45 Network Card 10/100Mbps RJ45 Ethernet Micro USB 2.0 Lan Cable Adapter For Android PC Laptop Tablets
Aliexpress UK
SKU: 003700 BRAND: kenable EAN: 5055383437009 WEIGHT: 0.02.
eBay
1000Mbps PCIE To RJ45 Network Card RJ45 PCI Express Converter 10/100/1000Mbps LAN Etherent Gigabit Adapter PCIe For PC Desktop
Aliexpress UK
This modular adapter has a DB9 female connector that plugs into DB9 RS232 serial port and converts it to an RJ45 connection. These modular adapters convert from a DB9 to an RJ45 socket jack (female).
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100/1000Mbps Ethernet Adapter USB 3.0 Type C RJ45 Wired Network Card For PC Laptop Desktop USB Gigabit RJ45 Lan Internet Cable
Aliexpress UK
This black RJ45 to RS232 DB9 male serial cable adapter for EPOS computer to connect to a serial device or printer. The adapter is designed with a RJ-45 connector on one end and a DB9 male connector on the other, making it easy to connect to different devices.
eBay
Vention New! 1000Mbps USB A C RJ45 Network Card USB Lan RJ45 Ethernet Adapter for MacBook Laptop Xiaomi Switch Windows USB Lan
Aliexpress UK
Got it 7 or so years ago as part of a setup for CCNA practice. Driver auto installed in Windows 11 - image from device manager attached.
eBay
Baseus USB C to Ethernet Adapter Aluminum Gigabit USB C Adapter for Laptop MacBook Pro 1000/100Mbps USB Lan RJ45 Network Card
Aliexpress UK
1x 9Pin RS232 Serial to Cat 5 RJ45 Ethernet Adapter. ✔️ Connector: RJ45 Male to 9 Pin RS232 Female. ✔️ DB9 male to RJ45 male connector cable for TCP/IP network interface doual-way conversion, with the serial port network function, support serial data and network data bi-directional transparent transmission.
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2500Mbps Ethernet Adapter 2.5G USB 3.0 Type C to RJ45 Network Card Wired Ethernet Gigabit Adapter Lan Card Hub for MacBook iPad
Aliexpress UK
Connection: DB9 (RS232) male to RJ45 female console adapter for TCP/IP network interface with the doual-way conversion, with the serial port network function, support serial data and network data bi-directional transparent transmission. Compatibility: Compatible with Standard 9 Pin D-sub RS-232 Devices, such as computer, laptop, printer, modem, router, PDA, POS device, digital CNC machine tool, Barcode scanner, etc. 65.6FT: Connect the equipment serial port to the RJ45 console port on routers, support maximum distance 65.6FT. Helpful: Nick-plated and Oxygen-free copper transmission port on the port minimize crosstalk, suppress noise, and protect against electromagnetic interference (EMI) and radio frequency interference (RFI),Premium adapter engineered.
eBay
USB Ethernet Adapter USB 3.0 Network Card to USB RJ45 Lan USB Wired Gigabit Network Adapter for PC MacBook Windows XP 7 8 10
Aliexpress UK