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DELL Service Tag CMOS read/change utility

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README.md

dell_service_tag — DELL Service Tag CMOS read/change utility

This utility reads/writes service tag from/to CMOS image on DELL machines.

Useful when cloning machines including CMOS settings — to preserve service tags (which would be cloned too otherwise).

Can be used directly on /dev/nvram or on an image created e.g. by:

If you don’t have /dev/nvram, try:

# dell_service_tag /dev/nvram A123456 # dell_service_tag /dev/nvram B234567 # dell_service_tag /dev/nvram B234567 

# cat cmos.bin >/dev/nvram # dell_service_tag /dev/nvram `dmidecode -s system-serial-number` 

Tested and working machines:

OptiPlex 745, OptiPlex 755, OptiPlex 760, OptiPlex 780

About

DELL Service Tag CMOS read/change utility

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View DELL Service Tag and Express Service Code From Linux and Windows

When you call DELL customer support for any help, they will ask for either Service Tag or Express Service Code. You also need service tag to download drivers and documentations from DELL support website.
When you have physical access to the system, you can easily identify the service tag affixed on the body of the server. DELL support site shows the exactly location of the service tag and express code stickers for various DELL equipments.

When you don’t have physical access to the server, you can get the same information remotely from the OS level. Using Windows or Linux command line you can easily get DELL service tag as explained below.

1. Get DELL Service Tag on remote Windows system

Login to the Windows remote-host using VNC or remote desktop connection. Use WMIC on Windows to get service tag as shown below.

C:\>wmic bios get serialnumber SerialNumber ABCDEF1

Following WMIC command will give make and model number along with service tag.

C:\>wmic csproduct get vendor,name,identifyingnumber IdentifyingNumber Name Vendor ABCDEF1 PowerEdge 2950 Dell Inc.

If VNC or remote desktop connection to the remote-host is not available, execute the following from the local-host to get the service tag of the remote-host.

C:\>wmic /user:administrator /node:remote-host bios get serialnumber SerialNumber ABCDEF1 [Note: Replace remote-host with the machine name of your remote-host.]

2. Get DELL Service Tag on remote Linux system

Login to the Linux remote-host using SSH. Use dmidecode on Linux to get service tag as shown below.

[remote-host]# dmidecode -s system-serial-number ABCDEF1

3. Get DELL Express Service Code From Service Tag

Service Tag is a base-36 integer. Once you have the Service Tag, you can calculate express service code yourself. Express Service Code is base-10 decimal integer of Service Tag. Dell uses express service code mainly for their support call-routing. When you call dell support, their automated call-routing system may ask you to enter express service code, which you can easily enter in your telephone, as it is just a bunch of numbers, instead of characters.

Use the following online tools to find express service code from service tag and vice-versa.

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How to find Dell service tag on any device.

For technical support or service on your computer you will need your service tag. Dell uses the service tag t check for device info such as specification and warranty status.

Finding the service tag is not hard. The dell service tags are all unique so you will need to give the technical folks the correct one. This is important because the service tag identifies your computer and the hardware your computer shipped with.

When ever your computer has problems, you need to have the service tag as customer service will request for it.

What is the Dell service tag?

The dell service tag is a 7 digit character code usual a combination of letters and digits that is specific to your device. It is usually located at the bottom of laptops and back of desktop computers next to the windows product key on most computers. For example service tag SMPL783 below. Also note if your computer shows the express service code that will work to as it can be converted to a service tag and the other way round

Is the service tag same as serial number?

The dell service tag is different from the serial number but they both perform the same function. As shown in the image above the service tag is as mixture of characters and numbers whilst the serial code or service code is just a sting of numbers. You can use the convert one to the other hence having either one will work .

Where to find the service tag

The location of the dell service tag sticker varies with devices. Its not always as visible as in the Dell optiplex sticker picture above. For example in some alienware desktops you have to pull the section that covers the front usb port and audio jacks.

Here are the couple of places to check for for the sticker with the service code.

1. On the bottom of laptops e.g on Dell inspiron its on the edge of the battery line.
2. At the back of desktops usually near the VGA port, sometimes found next to the windows product key, so if you see the windows logo check there.
3. On some servers there a rubber sticker that you can pull at the back.

Basically look for a sticker like the one in the image of the optilex above.

How to find service tag if sticker is missing?

Sometimes the sticker is not always there.

Maybe the sticker rubbed or peeled off, not reason to worry.

The one on my XPS 13 already had vanished in less than 3 months. I do not know why they make the stickers easily removable. Just slight friction and it gets removed. Don’t worry though there are still plenty of ways to get the service tag without the sticker.

Find Service tag from BIOS.

First I will show you how to get the service tag from the BIOS menu

1. Switch off the computer.
2. Press the power button to turn the computer.
3. On the Dell logo splash screen quickly press F2.
4. On the Bios menu look for serivce tag, a 7 character code or combination of numbers and letters under system information.

Your BIOS menu will be different depending on the laptop or desktop you are using but you should be able to locate it on the Main or General category of the BIOS section.

Finding a dell service tag from the command line

If you are familiar with the windows command line you can also use it to find the service tag. You can use the command prompt or powershell. In windows press the windows start button, search for “run” right click and select run as administrator, alternative shortcut would be to press SHIFT+windows key + R key. Now type cmd press enter.

Enter the following command without quotes ” wmic bios get serialnumber”

This command uses the Windows Management Instrumentation Command-line (WMIC) to show you the data that you are looking from. The service tag number is the one under serialnumber.

You can even do this remotely but you need to have the administrator password. To access the service tag remotely this the command “wmic /user:administrator /node:remote-host bios get serialnumber” replace the remote-host in bold with the IP address or workstation name.

You can even get more info with the following command “wmic bios” this will get you bios, operating system information and other geeky information about the computer including the tag.

Linux

If you are using the Linux operating system you can also get the Dell service tag from the terminal. The command on linux is as follows:

Local Dell Computer or server

# dmidecode | grep -i serial
OR
# dmidecode -t 1

Remote Dell computer or server

You will need to use secure shell. Depending on what you have the I.P Address or domain type either of the commands belows

$ ssh root@remote.dell.server.example.com OR $ ssh root@152.52.1.1 to use the IP address

or just do $ ssh root@remote.dell.server.example.com dmidecode -s system-serial-number

$ ssh root@152.52.1.1 dmidecode -s system-serial-number

Service tag using Powershell

You can also use powershell to find the service atg though its almost the same as the method above of using command prompt. For powershell use the Get-wmiObject command below

“Get-WmiObject win32_SystemEnclosure | select serialnumber”

How to find the Service Tag on a Dell Wyse product?

Dell system detect software

Dell created software that can detect the system that you are using this comes in handy when you are looking for the Dell service tag.

1. Enter click this link
2. Click detect system next to submit .
3. Check the terms and conditions box and click continue.
4. Downloading of software install should begin.
5. Run the software and let it download the rest of the package about 2.5mb.
6. The results will show on the website after its done detecting.

The methods above may also work on your powerdge 840 server or any server depending on the system and configuration.

Let us know in the comments sessions of what we missed.

8 comments

Very nice write up! You might mention that for the Linux command you probably have to run as root (i.e., sudo). Also, as far as I know the Dell detect software only works with Windows.

It is usually located at the bottom of laptops and back of desktop computers next to the windows product key on most computers.

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I used to have a batch file that would get the service tag of a remote Dell PC over the LAN. Now I no longer have it, I haven’t used it in a long time, and how frustrating, now I need it and can’t find it. I tried the SSH command and it came back with connection refused. I guess SSH needs to be enabled on the remote PC.

I’ve just bought a Dell XPS 15 9530. On my old XPS15 there was a flap in the underside that could be lifted to read the Dell Service Tag. Now I’d have to unscrew 8 little screws and remove the back entirely.

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