Thankfully as time has passed, those have gotten a lot more standardized. It’s rare to find anything these days that isn’t the Cisco pinout. Most new stuff is just USB which is even better. But vendors who use USB connectors without putting USB on the port annoy the crap out of me. Answer from cyberentomology on reddit.com
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Reddit
reddit.com › r/networking › better db-9 to rj-45 solutions?
r/networking on Reddit: Better DB-9 to RJ-45 solutions?
August 27, 2023 -

Probably like many, I've got a stack of these DIY DB-9 to RJ-45 adapters for console access because every manufacturer is special and needs their own unique pinout to accomplish basic serial communication.... Worked well enough with my Toughbook CF-19, but need another serial extension cable to fit in the flush DB-9 ports on things like my Dell Latitude Rugged laptop and CF-20 tablet.

Cleaning/reorganizing my tool bag today, looking at these things, and curious if there's a better mousetrap out there? I know could just pick up a generic premolded RJ45 female to DB-9 adapter, then make custom CAT5 cables to match, but that would take up a lot more room in the tool bag too.

Would be great if someone made something similar to these custom adapters but with a molded DB-9 end, or maybe something like a RJ-45 coupler that could be repinned, so I wouldn't have to carry a bunch of bulky cables.

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Amazon
amazon.com › Adapter-Ethernet-Converter-Compatible-Standard › dp › B08JLX4N6K
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
Full content visible, double tap to read brief content. ... Connector A: DB9 9 Pin Male Connector B: RJ45 8 Pin Female Data cabling transmission signal up to 20M Compatible with Standard 9 Pin D-sub RS-232 Devices e.g. computer laptop, printer, modem, router, PDA, POS device, digital CNC machine tool, Barcode scanner, etc.
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Antaira
antaira.com › products › CB-RJ45-DB9M-90
RJ45 to DB9 Male Serial Cable - 90cm
RJ45 to DB9 Male Serial Cable - 90cm | Antaira · To request more information regarding our products, please fill out the following online form and a customer service representative will contact you immediately. Fields marked (*) are required. Thank you
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Amazon
amazon.com › RS232-Serial-Female-Ethernet-Console › dp › B01M9COPMA
Amazon.com: LFHUKEJI RJ45 to DB9, DB9 9-Pin Serial Port Male to RJ45 Cat5 Ethernet LAN Console Cable 9.8Ft : Electronics
LANMINGLEL RJ45 to DB9 Cable RJ45 Male to DB9 9-Pin Female RS232 Serial Port Cat5 Ethernet LAN Console Cable RJ45 to RS232 Networking Devices Console Cable for Routers, Switches 0.5M
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SF Cable
sfcable.com › db9-female-to-rj45-modular-adapter-color-black.html
Buy DB9 Female to RJ45 Modular Adapter Color Black Online | SF Cable
DB9 Female to RJ45 Modular Adapter Color Black
This modular adapter has a DB9 Female connector that plugs into DB9 RS232 serial port and converts it to an RJ45 connection. RJ45 Pinout: · Pin1 -- Blue · Pin2 -- Orange · Pin3 -- Black · Pin4 -- Red · Pin5 -- Green · Pin6 -- Yellow · Pin7 -- Brown · Pin8 -- White · Gold plated pin 28AWG wire Molded adapter Thumb screw · Black color ·
Price   $1.54
Find elsewhere
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Juniper Networks
juniper.net › documentation › us › en › hardware › mx2020 › srx4600 › topics › concept › port-rj45-db9-adapter-pinout.html
RJ-45 to DB-9 Serial Port Adapter Pinout Information | Juniper Networks
The console port on a Juniper Networks ... pin and you want to connect your laptop or desktop PC to the device, use a combination of the RJ-45 to DB-9 socket adapter along with a USB to DB-9 plug adapter....
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US Converters
usconverters.com › db9-rj45-adapter
DB9 to RJ45 | RJ45 to Serial converter | RJ45 serial adapter
Use this DB9 to RJ45 adapter, also called a rs232 to rj45 converter or simply a rj45 serial adapter, to convert any standard 9-pin DB port to a standard RJ45 port. These modular adapters comes unassambled and are not functional until they are assembled.
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Get Console
get-console.com › shop › en › accessories › 46-rj45-db9.html
Adaptor and Dongles to convert RJ45 Serial to DB9 Serial
RJ45-DB9 (Female) Adapter for C2/L2-RJ45... US$6.00 ... RJ45 (female) to DB9 (female) adaptor block for use with the Redpark C2-RJ45 cable to convert it for use with DB-9 console ports.
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Eaton
tripplite.eaton.com › products catalog › network adapters › p44089ff
DB9 to RJ45 Modular Serial Adapter, RS-232 | Eaton
U336-06N-2P5-B USB to RJ45 Gigabit ... Serial Adapter (F/F) is designed for connecting terminals, serial printers, modems, POS and other serial devices to your network via twisted-pair Cat5e/6 cabling....
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Micro Connectors
microconnectors.com › modular-adapter-db9-male-to-rj45
Modular Adapter (DB9 Male to RJ45) - Micro Connectors, Inc.
Modular Adapter (DB9 Male to RJ45)
For serial printers, terminals, modems, POS and other serial equipment
Price   $5.99
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Westward Sales
westwardsales.com › home › antaira › cb-rj45-db9m serial cable, rj45 to db9 male, 30/90 cm length
CB-RJ45-DB9M Serial Cable, RJ45 to DB9 Male, 30/90 cm Length
CB-RJ45-DB9M Serial Cable, RJ45 to DB9 Male, 30/90 cm Length
CB-RJ45-DB9M RJ45 to DB9 Male Serial Cable, 30/90 cm The CB-RJ45-DB9M is a serial straight-through cable that converts an RJ45 to a DB9 (male) connector. It is 30 or 90 cm (11.8 or 35.4 inches) in length.  The cable is constructed from UTP CAT5e with 24 AWG gauge wires.  The molded DB9 features locking screws for a secure, stable connection. The CB-RJ45-DB9F is an optional cable accessory for the Antaira STE-708 and STE-716 industrial Serial-to-Ethernet device servers.
Price   $11.00
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Amazon
amazon.com › db9-rj45-adapter › s
Amazon.com: Db9 To Rj45 Adapter
DTECH RS232 DB9 to RJ45 Serial Adapter DB-9 Female/Male to RJ-45 Female Ethernet Converter (2 Pack) · DTECH DB9 to RJ45 Console Cable Cisco Device Management Serial Adapter 72-3383-01 CAB-CONSOLE-RJ45 (6 Feet, Blue) · XMSJSIY DB9 RS232 to RJ45 Extender, DB9 9-Pin Serial Port Female&Male to ...
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eBay
ebay.com › itm › 286287717644
DB9 to RJ45 Serial 9 pin RS-232 Male to RJ45 LAN Ethernet Extension Adapter | eBay
DB9 to RJ45 Serial 9 pin RS-232 Male to RJ45 LAN Ethernet Extension Adapter
DB9 to RJ45 Serial 9 pin RS-232 Female to RJ45 LAN Ethernet Extension Adapter . Condition is New. Shipped with USPS Ground Advantage.
Price   $14.98
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StarTech.com
startech.com › home › cables › network cables & adapters › t1 cables & router cables › db9concabl6
6 ft RJ45 to DB9 Cisco Console Cable | T1 Cables & Router Cables
6 ft RJ45 to DB9 Cisco Console Management Router Cable - M/F
6 ft RJ45 to DB9 Cisco Console Management Router Cable - M/F
Price   $24.59
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Makers Electronics
makerselectronics.com › product › db9-to-rj45-serial-adapter-rs232-mal
DB9 to RJ45 Serial Adapter RS232 Male to RJ-45 Female Ethernet Converter
DB9 to RJ45 Serial Adapter RS232 Male to RJ-45 Female Ethernet Converter
Compact DB9toRJ45 serial adapter: RS‑232 male to RJ‑45 female, color‑coded wiring, thumbscrews for secure connection ideal for modular CAT cable use.
Price   EGP 25.00
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Newegg
newegg.com › p › pl
db9 male to rj45 adapter cable | Newegg.com
DB9 RS232 to RJ45 Extender, DB9 9-Pin Serial Port Female&Male to RJ45 CAT5 CAT6 Ethernet LAN Extend Adapter Cable-2pcs (2-Cable) ... Specifications: Serial Port Ports: 1 Protocol: RS232 Connector: DB9 Connector - 9 Pin Male Tx FIFO Size: 256 ...