rj-45 pinout wiring

Easy RJ45 Wiring (with RJ45 pinout diagram, steps and video)

RJ45 Pinout Diagrams, the Tools You Need and more!

Making RJ45 wiring easy when you have the right RJ45 pinout diagram. Several variations are shown below. I carry Ethernet cable with me all the time so you know it will be useful. To help you memorize it, I created an easy poem so you will always remember the most popular cable wiring color order. I also share a video to help. Just follow the steps below to create your own. If you are looking for an Ethernet crossover cable you can make one following the steps below and paying attention to the relevant note. Read on!

The first thing you need to do when making Ethernet cable is make sure you have the right tools. While I’ll cover that further below, you can also check out TheTechMentor.com article that reviews complete network installation tool kits here.

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I’ll get straight into showing the diagrams and provide more options and details further below.

Make sure you use the correct RJ45 Pinout wiring diagram for your needs.

There are a couple of standards and there is also crossover cable, so make sure you study the RJ45 Pinout diagrams below to get the right one for your needs. The following is for T568 B (most common).

rj 45 pinout

This RJ 45 pin diagram (T-568B) shows everything you need in one handy image, with iso-view and RJ45 color order, suitable for printing quite large.

I like this pinout diagram because it shows everything you need. It includes an isometric view and pin-color order table, all in one large diagram. You can print it for the wall, though the smaller one below also shows what you need within a smaller diagram which may be better to print and carry with you.

You may already know each Ethernet cable has four wire pairs.

All your Ethernet connectors (8P8C) have eight pin slots.

Always face the clip away from you so you see just the flat side with the pins. You count (or label) the cables from left to right from 1 to 8 (easy!).

There are two standards for wiring Ethernet cables, these are T568A and T568B. T568B is the most common and is what we’ll be using for our straight Ethernet cable.

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RJ45 Pinout Diagram

As I explained, the most popular and most common is the T568B standard which has surpassed the first standard (T568A). Either configurations wire the pins straight through (i.e. pins 1 through 8 on one end are connected to pins 1 through 8 on the other end, provided you wire them the same at each end).

Please do also check out the RJ45 Pinout Poem below which is easy to memorize with the aid of the diagram provided and it means you won’t ever forget it!

If you agree the poem might work for you or others, please share it with your colleagues!

Note: as stated above, the tab is away from you (hidden behind) as you count the pins 1 to 8.

Here is a simple RJ45 Pinout Diagram (which still shows the wiring you need):

RJ45 Pinout wiring diagram

RJ45 Pinout wiring diagram (std T568B). Feel free to print it and carry it with you. If you want a larger diagram see further below. Normally a string of colors is difficult to remember similarly to phone numbers. It is surprisingly easy to memorize these colors as you’ll see. Read on to learn how!

You can follow the step by step instructions further below to make them up.

It might not be practical to always carry this RJ45 pinout diagram with you.

It can be easy to memorize the order, if you know how. I strongly recommend it. Then you can impress everyone that you have memorized it and say the colors in order quickly.

While the RJ45 B pinout wiring order is more recent and more commonly used these days, the T568 RJ45 A wiring order is still quite common (you just want to be consistent and use the crossover cable further below where necessary).

RJ45 A pinout diagram

This diagram shows the original T-568 pinout wiring order. Again, as per it’s counterpart shown further above, this one is small but ideal to print and carry with you.

The next pinout diagram below is the counterpart for the more detailed isometric and T-568-B RJ-45 wiring above, showing rj45 pin numbers and color order for T-568 A. Can you pick which pairs are swapped relative to the T-568B wiring diagram?

T568A Wiring Diagram with RJ45 Pin numbers and wiring order:

RJ 45 Pinout T568 A wiring diagram

In this RJ-45 A wiring diagram you can see the isometric view and color order. The swapped wiring order pairs are explained further below.

I mentioned a way to memorize the RJ45 Pinouts. The way to do it so you never need to rely on printouts again is by using the memorization tools below.

RJ45 Pinout Poem

First a question; what thing has color that also is has the name of the color? An orange of course!

This is the first wire pair base color.

This poem (or riddle) yields the colors of wiring to pin 1 through 8. See further below as to how this mnemonic (memorization technique) helps you remember the RJ45 pinout order.

Remember you saw it here first on TheTechMentor.com!

RJ45 pinout poem picture

The RJ-45 Pinout diagram poem and picture is for the more common T568B RJ45 wiring.

While an Orange is Orange

What Green eyes are Blue?

When Blueberries in Greenland

Want Browner Brownies too!

It works well as the construction of the poem is made to match the RJ45 pinout. The riddle, with the wire colors used, only makes sense in this order.

Memorization Techniques included:

There are several patterns, rhyming verses and emotional elements to note which really help you remember it.

  • The orange is first on top and easiest of all to remember since an orange is orange! So it goes first.
  • Each pair has a ‘w’ letter first combined with the following letter, thus giving the white striped wire color first of every two wires. This is a helpful pattern to remember.
  • The question and answer format (2 lines each) or riddle helps keep the pattern straight.
  • You’re asking what green eyes are ‘blue’ (sad). There are so many songs talking about certain color eyes being blue (sad). In this case we ask what green eyes are blue. It probably should be ‘whose’, but to make a sound closer to ‘white’ we ask ‘what’ instead.
  • The answer relates to blueberries of Greenland. Remember a country that has a color – Ireland just wouldn’t work here! The sad little blueberries have to be on something – they are on the land, so they come first before the land (blue before green).
  • In the end, the brownies followed by ‘too’ give a rhyme with ‘blue’. The critters want darker brown brownies like everyone else has. The last two main colors are the same (brown and brown) just as the first two main colors are the same (orange and orange).

It helps that you remember the image too, as each wire pair color is in order top to bottom (and left to right).

I recommend you draw it out, in color (optional). I suggest you do this and repeat the poem while you do it.

If you do, you will always remember the RJ45 pinout and you will not need a diagram anymore!

It’s a silly image and that also helps you remember it.

How does the poem provide the colors?

So the poem with the color codes explained is like this.

While an Orange is Orange (W-O, O)

What Green eyes are Blue? (W-G, B)

When Blueberries in Greenland (W-B, G)

Want Browner Brownies too! (W-B, B)

I’ve put a larger version below as well in case you want to take a copy.

NOTE: you are welcome to print so long as you keep TheTechMentor.com on the printed image, and if you have a website you are welcome to use on a website so long as you link back to this article. Use of the poem also requires a link back to this article (thank you).

RJ45 pinout poem picture

RJ45 Pinout poem picture explanation, giving WO, O, WG, B, WB, G, WB, B for the wiring to pins 1 to 8 (for T568B RJ45 wiring). [You are welcome to print so long as you keep TheTechMentor.com on the printed image, and use on a website so long as you link back to this article.]

I’m pretty sure if you repeat this poem the first few times you prepare your RJ45 wiring (by following the step by step procedure below), you won’t forget the color order after that.

Note: if you mumble the RJ45 Pinout Poem, it sounds like you are saying the pinout order!

Tell me what you think!

Please comment below and let me know what you think. Do you like my new Pinout Poem and think it will help you or someone you know? Is it bad? How could it be better?

Do you like my artwork (the RJ45 Pinout Poem Pic.)?

Should I not give up my day job just yet?

Okay, so you may not be interested in the poem. If not, then the tables below provide you with a serious view of the data.

Ethernet Cable Plug RJ45 Pinout (Wiring Color) Table for T568B

The table below show the proper Ethernet plug wiring with orientation of the colored wires to the pins for the Cat6 Cable we’ll make (ie. the more common T568B standard cable, with a spine). See also the diagrams further below within the step by step instructions.

T568B Std.
Ethernet Cable Plug
Pin Number
Wire Color
1 White-orange
2 orange
3 White-green
4 blue
5 White-blue
6 green
7 White-Brown
8 Brown

Ethernet RJ45 Pinout for T568A

Just for completeness I’ll list out the cable color order for the other Ethernet cable plug standard (T568A). Remember not to mix the two on one cable! Unless you want a crossover cable.


T568A Std.
Ethernet Cable Plug
Pin Number

RJ45 color

1 White-green
2 Green
3 White-Orange
4 Blue
5 White-blue
6 Orange
7 White-brown
8 Brown

Ethernet RJ45 Crossover Cable Wiring

NOTE: Of course if you want to make a cross over cable, then you can make the cable wiring to the different standard alignments at each plug (i.e. one end will have the T568B and the other the T568A). There is also a diagram of this showing the wires in color further below.

Ethernet Crossover Cable Wiring Pinout

In RJ45 Ethernet crossover cable wiring, it is almost as easy as 1, 2, 3. They are the first three numbers to remember anyway.

Yes, here come some more memorization techniques!

You can remember which cables are switched by remembering twelve thirty-six to thirty-six twelve (12 36 to 36 12) for the Ethernet cable plug pin numbering above.

That means 1 goes to 3, 2 goes to 6; 3 goes to 1 and 6 goes to 2.

This gives you the relevant switch of T568A to T568B (and vice versa, i.e. T568 B to T568 A).

  • It is easier to remember because it makes it seem like just 2 pairs of numbers, then reversed.
  • First pair is 12, say like 12 months in the year.
  • Second pair is 36, (well, 3 follows on from 1 and 2, and 36 is three times 12 the first pair).
  • Or using 1, 2, 3: the first numbers are 1, 2 and 3, and the last number is 1 x 2 x 3 which equals 6.

It helps if you can remember that the first three numbers are 123. So easy! 3 is the hook to get the final pair, as 12 times 3 gives the second pair. There are many different memorization hooks you can use.

Still having a little difficulty visualizing the crossover pinout? Here is a diagram I hope will help.

RJ45 Crossover Cable Pinout

rj45 ethernet pinout crossover cable

RJ45 Pinout to make an Ethernet crossover cable. This is useful to visualize the ’12’ ’36’ to ’36’ ’12’ pinout rj45 crossover pattern, making it look simpler than it sounds. Note all we really have is the orange base color pair swapping with the green base color pair.

Okay, now on with the method.

How to make an RJ45 Ethernet Patch Cable Like a Pro!

Follow the step by step instructions below.

Note: The term ‘patch’ cable is just another way to describe a shorter or room-run cable.

Step 1: Cut and Strip

The cable not you! (Wink!)

Cut and strip the cable jacket about one and a half inches to the end. As we state elsewhere we own the TRENDNet cut and strip tool, but obviously use the one of your own preference. See further below for the tool links.

Step 2: Spread the Ethernet Cable Wires

Spread the four wires apart. For Cat 5e, you can use the pull string to strip the jacket farther down if you need to, then cut the pull string. As you may know, you need to cut out the spine from a Cat 6 cables before inserting into the Ethernet cable plug.

Step 3: Untwist the Wire Pairs

Untwist the wire pairs and neatly align them in your chosen orientation based on the RJ45 pinout, my pinout poem, the table(s) above or the RJ45 Ethernet pinout image below (T568B shown).

Basic RJ45 pinout wiring diagram T568B

Basic RJ45 Pinout wiring diagram T568B as you insert into the RJ45 Connector (note tab is at the back)

This is a simpler version. Otherwise you can use the more detailed RJ45 Pinout Diagram 1 above.

NOTE: Do not untwist them down the cable further than where the jacket begins; you should aim to leave as much of the cable twisted as possible.

Step 4: Cut Again (Evenly)

Cut the wires as straight as possible, about half an inch from the end of the jacket. This is important as you want them all to sit evenly inside the cable plug. If you want to, you can hold it against the boot and mark with a permanent ink pen first.

Step 5: Insert Wires Into the Ethernet Cable Plug

Carefully insert the wires all the way into the modular connector, making sure that each wire passes through the appropriate guides inside the connector. Again, make sure you reference the RJ45 pinout diagram at this crucial step until you have it memorized.

Step 6: Crimp It!

Push the connector inside the crimping tool and squeeze the crimper all the way down.

So that is one end of our RJ45 wiring.

Repeat the above steps to attach another plug to the other end of the cable.

As I wrote above, you can make an Ethernet crossover cable by making the other end as a T568A, as per the image below.

RJ45 Pinout Diagram for T568 A

The RJ45 Ethernet Pinout below is still used, it’s just that the T568B is more common these days. It effects how the wires spread out from the main cable. In the end though, so long as you make sure you use the same pinout at each end, you will have your working Ethernet cable.

RJ45 pinout wiring T568A

Cat5 Pinout diagram showing how to make an Ethernet plug wiring as inserted into the RJ45 connector

Ideally, to make sure you’ve properly terminated each end of the cable, use a cable tester to test each pin (see the link to a cheap cable tester in the tools below). This is when you will know if you cut your wire pairs evenly enough!

RJ45 Crossover Cable Pinout

To make an Ethernet Crossover cable, your cable pugs would be terminated like so:

How to make ethernet crossover cable diagram

Ethernet crossover cable end boots. Can you see the 12 36 to 36 12 pattern? Tabs are to the back (as usual).

Now that you’ve made your cable, then what? You might like to use it as Ethernet cable for gaming in your own LAN or maybe to connect up to the internet. It is a nice feeling to stop and remind yourself that you are using the Ethernet cable you made!

If you are looking for Cheap RJ45 cable plugs (Ethernet cable connectors) and Ethernet wiring etc., please see the links below.

If you are going to do a Network Tech Course (The Cisco CCNA for example) get yourself a head start by following this guide to get some practice in.

Before you can get started, you need to make sure you have the necessary tools, and decide whether you’re going to use Cat 5e or Cat 6 network cables (the ones with the spline to increase separation distance for performance reasons).

I hope the list below helps.

Legal Note: These links are provided for your benefit and are not necessarily recommendations by us of one brand over another. A helpful list is what we want to provide – if you have suggestions for others, please put it in the comments at the end of the article. We might get a very small fee for referring you, provided your purchase qualifies, that won’t affect your cost.

Computer Repair Hardware Tools25ft CAT6 Patch Cable

You are going to make one of these, but you can start off with a long CAT6 cable and make several smaller ones for practice following the RJ-45 Pinout diagrams above. They will come in handy later too. I always carry a patch cable in my toolkit for obvious reasons, so it is a good idea to get a long one anyway.

The longer the better especially when trying to plug in to a wall port or switch that fortune has it way of in the distance. Or you can cut and practice more wiring and crimping.

If you want you can just get a cheap ‘Amazon Basics’ cable:

You can find their Unshielded twisted pair (UTP) patch cable here>.


Pink rj45 crossover cables are all the rage.

PINK is the New Black! Er.. Blue?

You might know you can get these crossover cables in different colors now.

You might love the 10 ft pink patch cable here!

Or you might like to find your own cable color for that matter. Maybe it’ll become the trademark of your installations!

Shout out to our women in tech!

Do NOT forget PURPLE! Follow the link and search for that if you like!

Okay, so those are some short cable options. Feel free to search around and find your own source. Moving on!

Buy Cable in Bulk = Cheap RJ45 Cable!

You might be ready to buy in bulk to save. To do this you want to look for pull cable like the following.

1,000 ft bulk Cat5e Ethernet Cable (Wire UTP with Pull Box Cat-5e-Style Grey Cable)

Cat 5e ethernet cable pull through

Cat5e Ethernet cable

This bulk cable of 1000 ft (308 meters) is by far the cheaper way to buy it. But it might just be too big and too much so I list it last. If you are just starting out I think you could get it as there will always be applications and it will go quicker than you think.

If you look closely at the picture, you can see there is the center hole in the wall of the box, so you can pull through as needed (great for long runs) with the clip to hold the end of the cable until next use.

Cat 5 RJ45 connectors

Computer Repair Tools list-RJ45 Connectors

Get a big pack of Cat 5 connectors

RJ45 Connectors

Used with my TRENDnet Crimp Tool to make new cables or repair damaged ones. Buy a big pack! You will probably use many of these.

(These connectors are also called 8P8C plugs.)

Computer Repair Hardware Tools- RJ45 CouplerRJ45 Female to Female Straight Coupler

I carry one of these around with me just in case I need to quickly make a longer cable. This one is optional for this exercise, but handy if you cut your long cable and then need to reconnect it!

These do not look the best in my opinion, so you might prefer couplers like these.
Depending on what you’re going to be doing, you might also consider to buy the following tool now, although it is optional for now (did I say it is optional?).

Computer Repair Tools list - Fluke network Probe (Click for more) Fluke Network Pro3000 Toner and Probe Kit

I use the Pro3000 for toning and tracing out Ethernet wires. It’s especially handy when the cable installers don’t label any of the ports! If you are going to be installing cables – THEN LABEL THE PORTS please!

And you will probably want other cables in time.

Additional Cables you might consider while you are at it:

Tools to Connect Your RJ45 Wiring

I mentioned above that there is another article with all the tools to help you make your RJ45 wiring, but I’ll put a few of the most relevant ones below too.

What you’ll need to use when following the above RJ45 pinout pics.

Computer Tools-Crimp Tool TRENDnet RJ11/RJ45 Crimp/Cut/Strip Tool

I use these for not only making new network cables but also replacing damaged RJ45 connectors on existing cables, using the RJ45 pinout poem shown above of course!

This is my preferred brand of Crimp and Strip tool. If you want you can search around on Amazon to find a brand to your liking (or price for that matter!).

Klein Tools Ratcheting Crimper

A more popular one among colleagues is the Klein Tools crimper.

Brilliant for cutting stripping and crimping.

Ratcheting action makes it easier. Versatile as it crimps 4, 6, and 8 position modular connectors (RJ22, RJ11/RJ12, and RJ45).

Computer Technician Tool Kit built with these Tools -Network Cable Tester Network Cable Tester

This basic network cable tester is used to determine if your cable is good, bad, or wired incorrectly. You will always use this one or one like this.

Also for a bigger list, I have written an article that gives you all the consumables along with a list of tools you’ll need as a computer repair technician (don’t worry if you never want to become a computer repair tech, but this list is gold!).

It has pretty much all the consumables you will need as well as the tools I use and have found to be the best in my work.

If that’s not enough of an explanation of how to make your own Ethernet cable, here is a video!

Here’s simple video tutorial that takes less than 10 minutes that shows anyone can do it. Do check out my links just above to check pricing before you buy any tools!

Are you new to Making Cables and Installing Networks?

If you are looking for RJ45 Pinouts then likely so! You would be well advised to check out Mike Meyers book on the CompTIA network plus book below. We have mentioned Mike Meyers books before, but of course you could check out a few books and get a different CompTIA network plus book if you prefer.

It’s very handy and as typical the CompTIA study course covers a lot of the basic knowledge or foundational knowledge that you need.

I know you may not intend to do exams and become a certified computer network technician. However, this book does provide worthwhile knowledge before you start cutting and crimping to any large degree.

For beginners, it is a book covering the basics and really is an essential network technician’s tool regardless of whether or not you intend to actually sit the CompTIA test.

Computer Newtork Installation maintenance repair toolkit

Mike Meyers’ CompTIA Network+ book is a great way to leapfrog your computer networking knowledge. Click the cover image to check it out on Amazon.

Well that wraps up this article all about RJ45 Pinout diagrams and wiring steps. I really hope you find the memorization techniques helpful so you can memorize the wiring colors. After all, that is why I created it! Please add your comments below.

Summary of how to make RJ45 Wiring Easily

I’ve shown step by step instructions how you connect each RJ45 Ethernet cable plug in order to make up your Ethernet patch cable (or RJ45 crossover cable) with a bonus video. You now have TheTechMentor.com’s RJ45 Pinout Poem, and the silly memorable image so that you might never need a pinout diagram again! Plus you now have all the RJ45 Pinout diagrams you will need to follow.

About The Author


Jeff (Surname withheld for family privacy) is an engineer with over 26 years experience. He first learned to program in Fortran 77! See the 'About Us' for more.

1 Comment

  • Tempar

    Reply Reply November 27, 2019

    I second the Female to Female couplers. Keeping half a dozen or so in my glove box was a life saver back when I was doing field work.
    The toner and probe kit is also seriously useful to have for a number of tasks but if the cost is off-putting you can get away using a cable tester to identify unlabelled (or incorrectly labelled) ports.

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