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Networx® CAT6 Gigabit RJ45 Loopback Tester

4.2 4.2 out of 5 stars 400 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Computer Networking Switches by Networx®
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CAT6
RJ45 Loopback
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Purchase options and add-ons

Compatible Devices PC
Connector Type RJ45
Color CAT6 1000 Mbits/s Gigabit RJ45 Loopback
Item dimensions L x W x H 3.56 x 3.25 x 0.78 inches
Brand Networx®

About this item

  • Check wall to switch connections easily without a cable
  • Easily check for broken or shorted wires
  • Must have for all pc and network technicians
  • A very user friendly and simple device
  • Compact design allows for testing in the tightest of corners

Additional Details

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Networx® CAT6 Gigabit RJ45 Loopback Tester

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Product Description

A Networx CAT6 Gigabit RJ45 Loopback Tester is an exceedingly user friendly cable tester. Even the architecture is pretty simple. It looks like a simple plug at first glance but the compact, rugged design makes it highly portable and usable in the tightest corners. All you have to do is simply plug the Networx CAT6 Gigabit RJ45 loopback tester into the jack that you want to test or the one you are suspicious about. If the link LED on your switch is active, then that means that the connection is operating perfectly. These Loop back testers will make the life of a network administrator really easy. The Networx RJ45 Loop back tester will negate the necessity to carry a bulky network hub around.

Customer reviews

4.2 out of 5 stars
4.2 out of 5
400 global ratings

Customers say

Customers like the ease of use of the adapter, saying it's very convenient and simple to use. They also like that it'll identify the port without having to ton out cables. However, some customers have reported issues with the LEDs not lighting up and the adaptor being a waste of money. Customers also disagree on performance and quality.

AI-generated from the text of customer reviews

7 customers mention7 positive0 negative

Customers find the electronic adapter very convenient, simple to use, and easy to identify the port.

"...Port identified! WAY easier than toning out cables!" Read more

"Very convenient to use." Read more

"Compact and convenient." Read more

"Works as described. Compact and convenient" Read more

3 customers mention3 positive0 negative

Customers find the electronic adapter convenient and compact. They also say it fits on their keychain.

"Compact and convenient." Read more

"Works as described. Compact and convenient" Read more

"It's a loopback tester and it works. Fits on my keychain. What's not to like?" Read more

40 customers mention12 positive28 negative

Customers are mixed about the performance of the adapter. Some mention it works great and is simple to use, while others say it didn't work at all, does nothing, and doesn't even passthrough.

"The item did not work. I tried several known good ports on my modem, router, 2 external switches and computer. Nothing. Nada. Zip...." Read more

"This flat out does not work...." Read more

"It's basic, but it's necessary, and it works VERY well. Can't tell what switchport a wall port goes to?..." Read more

"...this for a particular job that I had needing the female end and it didn't work...." Read more

13 customers mention9 positive4 negative

Customers have mixed opinions about the quality of the adapter. Some say it's a great tool for testing and a network diagnostic tool, while others say it has poor quality control and is not worthy of even one star.

"Nice network diagnostic tool." Read more

"Very Good product and works as it it intended for. Just make sure you get the right one for the job. The Gig loopback is different from the RJ45...." Read more

"...after reading some of the other reviews, but the quality control on these products is horrendous and I would advise anyone to not take a chance on..." Read more

"Plug into router. See loop.. Plug on cable.. see loop.. great tool for testing." Read more

7 customers mention0 positive7 negative

Customers are dissatisfied with the led of the adapter. They mention that it doesn't illuminate for that port, the links LEDs stay off, and the network interface stays off.

"...Nope. No port lit up. When I plug in a laptop or something, the switch ports light up...." Read more

"...I never get the blinky lights. I have tried plugging in to a port that is functioning before I remove the Ethernet. Still nothing...." Read more

"...Again, no LED. It's worthless." Read more

"...The lights on the network interface stay off on all of them and these are all working interfaces...." Read more

5 customers mention0 positive5 negative

Customers are dissatisfied with the value of the adapter. They mention that it's a waste of money and a useless piece of plastic.

"...Again, no LED. It's worthless." Read more

"...I tested it on a port that I know works, and nothing. Wasted money. Amazon: give us a way to rate something zero stars! This doesn't deserve one star." Read more

"No loopback, not even passthrough. Total waste of my valuable time. Pinout confirmed, just lousy quality control...." Read more

"I both two bags of 10 each. none worked. totally worthless. will return." Read more

Super Convenient
5 Stars
Super Convenient
Can keep it on my badge keys so it is always with me. Works perfectly.
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Top reviews from the United States

Just A Little IT Guy (Jalitg)
5.0 out of 5 stars IMPORTANT TOOL for every network engineer.
Reviewed in the United States on January 17, 2024
Size: CAT6Style: RJ45 LoopbackVerified Purchase
It's basic, but it's necessary, and it works VERY well. Can't tell what switchport a wall port goes to? Throw on loopback detection on every port, plug this thing in, BOOM! Port identified! WAY easier than toning out cables!
Helpful
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Flyngreg
5.0 out of 5 stars Good product, great for troubleshooting older ethernet devices
Reviewed in the United States on February 7, 2024
Size: CAT6Style: RJ45 CrossoverVerified Purchase
Many older devices without auto-negotiation of RX-TX pin positions need a crossover cable rather than a common straight-through cable. This makes it easy to swap without needing a separate crossover cable.
Helpful
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Jasper
5.0 out of 5 stars Does exactly what it claims.
Reviewed in the United States on January 9, 2024
Size: CAT6Style: RJ45 LoopbackVerified Purchase
Nice network diagnostic tool.
Helpful
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Bill Vanyo
1.0 out of 5 stars As others have stated, it DOES NOT work with a gigabit switch.
Reviewed in the United States on September 19, 2023
Size: CAT6Style: RJ45 LoopbackVerified Purchase
I bought it and tested it by plugging into my 24 port gigabit switch. The port light should have lit, but did not. So I returned it in exchange for another, and the same thing happened with the replacement. Checking the reviews, I saw some people say it doesn't work with gigabit equipment, so I tried it on a 10/100 switch, and sure enough, it worked fine, but it is clearly labelled as "Networx CAT6 Gigabit RJ45 Loopback Tester" ... gigabit.
3 people found this helpful
Helpful
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John McConda
4.0 out of 5 stars Still not entirely sure how it works.
Reviewed in the United States on March 30, 2016
Size: CAT6Style: RJ45 LoopbackVerified Purchase
I got no use out of this. I won't give it a bad review just for that, but it could be more clear as to what it does. I wanted to use it to test my home data jacks, but I guess it's really only made to test cables? I still don't get it.
4 people found this helpful
Helpful
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Jose Carlos Figueroa
5.0 out of 5 stars Intended for IT
Reviewed in the United States on November 16, 2021
Size: CAT5EStyle: RJ45 LoopbackVerified Purchase
Very Good product and works as it it intended for. Just make sure you get the right one for the job. The Gig loopback is different from the RJ45. Although technically both are RJ45 structure, the internal wiring is different. These loopback are great for Analyst remoting-in and conducting their own company proprietary test on their machines.
One person found this helpful
Helpful
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Todd G
5.0 out of 5 stars Very convenient
Reviewed in the United States on May 27, 2023
Size: T1/E1Style: RJ45 CrossoverVerified Purchase
Very convenient to use.
Helpful
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Chris Sorensen
5.0 out of 5 stars A Test Kit Must
Reviewed in the United States on September 4, 2020
Size: CAT5EStyle: RJ45 LoopbackVerified Purchase
Having a reliable way to quickly to check for a port failure is a must. Doing a quick loopback test is a fast, easy way to check a port. I like the design of this device because all of the wires are tucked inside the body.
Helpful
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Top reviews from other countries

Tony Vines
1.0 out of 5 stars Device Failed Its Test
Reviewed in Australia on February 18, 2021
Size: CAT5EStyle: RJ45 LoopbackVerified Purchase
Despite the warnings from other buyers and the fact that it is made in
China, I bought the device. Unsurprisingly it did not work. A refund is on the way. Hopefully that will work as it is made in the USA!
Report