Ignore the erroneous answer that Cat 8 is a marketing gimmick. As noted by someone else, Cat 8 is rated for 40Gbps/2000Mhz which most people, especially home users, cannot utilize at this time. If you want to future proof your wiring, get Cat 8 but at the speeds you mention, a decent shielded Cat 5e or Cat 6 or 6a will work just fine. You'll see no speed boost just from a "faster" cable. Avoid Cat 7 and 7A due to finicky proprietary connector issues.

Does this have to plug into the router or can it plug into a Wifi extender?

If your wifi extender is set to allow connections to your main access point via the Ethernet port, then yes. It will work just like any other Ethernet cable. If you have tried a different cable and it did not work, your extender is either not setup properly to allow this or it is not capable of it.

will this cable make a difference if I'm already hitting max speeds with my cat6? my interenet speed plan is 400mpbs

Cat6 or Cat6a is all you need. Any latency you feel is either the port or you provider. CAT8 is bs, save your money.

Does this cable have any markings on the cable itself that identify it as category 8?

Other than Cat8 written in white on the actual cable. There are no other markings on it.

DbillionDa Cat8 Ethernet Cable, Outdoor&Indoor, 6FT Heavy Duty High Speed 26AWG, 2000Mhz with Gold Plated RJ45 Connector, Weatherproof F/FTP UV Resistant for Router, Modem, PC, Gaming

DbillionDa Cat8 Ethernet Cable, Outdoor&Indoor, 6FT Heavy Duty High Speed 26AWG, 2000Mhz with Gold Plated RJ45 Connector, Weatherproof F/FTP UV Resistant for Router, Modem, PC, Gaming

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Product ID: 136595334

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Brand
DbillionDa
Connector Type
RJ45
Compatible Devices
Personal Modem
Special Feature
Heat High UV
Compatible Phone Models
Any device an

⚡40 Gbps blazing speed

🌦️Weatherproof & UV resistant

🛡️Double shielded EMI/RFI protection

Description

⚡ Connect faster, game harder, stream smoother — the cable that never quits!

THICKER 26 AWG GAUGE - Superior cable thickness ensures faster, more reliable performance for smart home devices and cloud servers.
BLAZING 40 GBPS SPEED - Experience ultra-fast data transfer that keeps you ahead in gaming, streaming, and work.
ALL WEATHER DURABILITY - UV-resistant, waterproof, and anti-corrosion design built to survive any environment, from scorching sun to heavy rain.
HEAVY DUTY DOUBLE SHIELDING - Minimize interference with F/FTP shielding for crystal-clear, stable connections indoors and outdoors.
UNIVERSAL RJ 45 COMPATIBILITY - Seamlessly connects with all your devices — from routers and gaming consoles to smart TVs and IP cameras.

The DbillionDa Cat8 Ethernet Cable delivers ultra-high-speed 40 Gbps data transfer with a 2000 MHz bandwidth, featuring heavy-duty double shielding (F/FTP) and a thick 26AWG gauge for superior performance. Designed for both indoor and outdoor use, it boasts weatherproof, UV-resistant PVC construction and gold-plated RJ45 connectors, ensuring durable, interference-free connectivity for routers, gaming consoles, smart devices, and more.

Specifications

Brand	DbillionDa
Connector Type	RJ45
Compatible Devices	Personal Computers, Laptop, Modem, Router, Gaming Console, Printer, Television, Server, Camera
Special Feature	Heat Resistant/ High Speed/ UV Resistant/ Water Resistant/ Waterproof/ Weatherproof
Compatible Phone Models	Any device with an RJ45 port, including Routers, Monitor, Modems, Printer, Smart Watch, PS3, PS4, PS5, Server, Projector, DVD Player, Patch Panels, Switches, Laptop, Scanner, Tablet, Notebooks, PCs, Network Cards, Macs, PoE Devices, Xbox Series X, Xbox Series S, Xbox One, VR, PlayStation Other Video Game Consoles, TVs, Hubs, Motherboards, RJ45 Adapter
Recommended Uses For Product	Any device with an RJ45 port, including Routers, Monitor, Modems, Printer, Smart Watch, PS3, PS4, PS5, Server, Projector, DVD Player, Patch Panels, Switches, Laptop, Scanner, Tablet, Notebooks, PCs, Network Cards, Macs, PoE Devices, Xbox Series X, Xbox Series S, Xbox One, VR, PlayStation Other Video Game Consoles, TVs, Hubs, Motherboards, RJ45 Adapter
Ethernet cable category	Cat 7
Color	Black
Connector Gender	Male-to-Male
Data Transfer Rate	40 Gigabits Per Second
Shape	Round
Number of Pins	8
Frequency	2000 MHz
AC Adapter Current	6 Amps
Unit Count	6 Count
Item Weight	3.33 Ounces
Gauge	26.0
Model Name	cat8 6ft ethernet cable
Specification Met	TIA
Indoor/Outdoor Usage	Indoor, Outdoor
Number of Items	1
Customer Package Type	Standard Packaging
Maximum Voltage	15 Volts
Outer Material	Polyvinyl Chloride (PVC)
Manufacturer	DbillionDa
UPC	787894603219
Item model number	cat8 6ft ethernet cable
Item Weight	3.33 ounces
Product Dimensions	9.06 x 8.66 x 0.47 inches
Item Dimensions LxWxH	9.06 x 8.66 x 0.47 inches
ASIN	B07QLXC6QR
Date First Available	April 24, 2019

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DbillionDa Cat8 Ethernet Cable, Outdoor&Indoor, 6FT Heavy Duty High Speed 26AWG, 2000Mhz with Gold Plated RJ45 Connector, Weatherproof F/FTP UV Resistant for Router, Modem, PC, Gaming

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Specifications

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