Vm Manual Mac Address

Select the virtual machine and select VM Settings. On the Hardware tab, select the virtual network adapter and click Advanced. Type a new MAC address in the MAC Address text box, or click Generate to have Workstation Pro generate a new address. Click OK to save your changes. Because, we don’t know what the mac address will be for the VM when we create it next time around. Attempted Resolution: As console access is not an available feature yet in Azure, you will basically be mounting the problematic OS disk as a data disk on a working VM to.

In Oracle VM VirtualBox, a virtual machine and its settings are described in a virtual machine settings file in XML format. In addition, most virtual machines have one or more virtual hard disks. These are typically represented by disk images, such as those in VDI format. The location of these files may vary, depending on the host operating system. See Section 3.1.1, “The Machine Folder”.

Global configuration data for Oracle VM VirtualBox is maintained in another location on the host. See Section 3.1.2, “Global Settings”.

By default, each virtual machine has a directory on your host computer where all the files of that machine are stored: the XML settings file, with a .vbox file extension, and its disk images. This is called the machine folder.

Hyper-v Vm Mac Address

By default, this machine folder is located in a common folder called VirtualBox VMs, which Oracle VM VirtualBox creates in the current system user's home directory. The location of this home directory depends on the conventions of the host operating system, as follows:

  • On Windows, this is the location returned by the SHGetFolderPath function of the Windows system library Shell32.dll, asking for the user profile. A typical location is C:Usersusername.

  • On Linux, Mac OS X, and Oracle Solaris, this is generally taken from the environment variable $HOME, except for the user root where it is taken from the account database. This is a workaround for the frequent trouble caused by users using Oracle VM VirtualBox in combination with the tool sudo, which by default does not reset the environment variable $HOME.

    A typical location on Linux and Oracle Solaris is /home/username and on Mac OS X is /Users/username.

For simplicity, we abbreviate the location of the home directory as $HOME. Using that convention, the common folder for all virtual machines is $HOME/VirtualBox VMs.

As an example, when you create a virtual machine called 'Example VM', Oracle VM VirtualBox creates the following:

  • A machine folder: $HOME/VirtualBox VMs/Example VM/

  • In the machine folder, a settings file: Example VM.vbox

  • In the machine folder, a virtual disk image: Example VM.vdi.

This is the default layout if you use the Create New Virtual Machine wizard described in Creating Your First Virtual Machine. Once you start working with the VM, additional files are added. Log files are in a subfolder called Logs, and if you have taken snapshots, they are in a Snapshots subfolder. For each VM, you can change the location of its snapshots folder in the VM settings.

You can change the default machine folder by selecting Preferences from the File menu in the Oracle VM VirtualBox main window. Then, in the displayed window, click on the General tab. Alternatively, use the VBoxManage setproperty machinefolder command. See VBoxManage setproperty.

In addition to the files for the virtual machines, Oracle VM VirtualBox maintains global configuration data in the following directory:

  • Linux and Oracle Solaris:$HOME/.config/VirtualBox.

  • Windows:$HOME/.VirtualBox.

  • Mac OS X:$HOME/Library/VirtualBox.

Oracle VM VirtualBox creates this configuration directory automatically, if necessary. You can specify an alternate configuration directory by either setting the VBOX_USER_HOME environment variable, or on Linux or Oracle Solaris by using the standard XDG_CONFIG_HOME variable. Since the global VirtualBox.xml settings file points to all other configuration files, this enables switching between several Oracle VM VirtualBox configurations.

In this configuration directory, Oracle VM VirtualBox stores its global settings file, an XML file called VirtualBox.xml. This file includes global configuration options and a list of registered virtual machines with pointers to their XML settings files.

The following table gives a brief overview of the configuration data locations on an Oracle VM VirtualBox host.

Table 3.1 Configuration File Locations



Default machines folder

$HOME/VirtualBox VMs

Default disk image location

In each machine's folder

Machine settings file extension


Media registry

Each machine settings file

Media registration is done automatically when a storage medium is attached to a VM

Oracle VM VirtualBox uses XML for both the machine settings files and the global configuration file, VirtualBox.xml.

All Oracle VM VirtualBox XML files are versioned. When a new settings file is created, for example because a new virtual machine is created, Oracle VM VirtualBox automatically uses the settings format of the current Oracle VM VirtualBox version. These files may not be readable if you downgrade to an earlier version of Oracle VM VirtualBox. However, when Oracle VM VirtualBox encounters a settings file from an earlier version, such as after upgrading Oracle VM VirtualBox, it attempts to preserve the settings format as much as possible. It will only silently upgrade the settings format if the current settings cannot be expressed in the old format, for example because you enabled a feature that was not present in an earlier version of Oracle VM VirtualBox.

In such cases, Oracle VM VirtualBox backs up the old settings file in the virtual machine's configuration directory. If you need to go back to the earlier version of Oracle VM VirtualBox, then you will need to manually copy these backup files back.

We intentionally do not document the specifications of the Oracle VM VirtualBox XML files, as we must reserve the right to modify them in the future. We therefore strongly suggest that you do not edit these files manually. Oracle VM VirtualBox provides complete access to its configuration data through its the VBoxManage command line tool, see VBoxManage and its API, see Chapter 4, Oracle VM VirtualBox Programming Interfaces.

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#Range or PrefixVendorVirtual Machine
100:50:56VMWareVMware vSphere, VMware Workstation, VMware ESX Server
200:50:56:80:00:00 → 00:50:56:BF:FF:FFVMWareVMware vSphere managed by vCenter Server
300:0C:29VMWareStandalone VMware vSphere, VMware Workstation, VMware Horizon
400:05:69VMWareVMware ESX, VMware GSX Server

OUIs registered by VMWare, Inc

There are 4 OUIs registered by VMware, Inc:

OUI Assignment Type

Detection Rule 1

Affects products: VMware vSphere, VMware Workstation, VMware ESX Server

Signature: OUI is 00:50:56


When the administrator assigns the MAC address manually to a virtual machine, this OUI prefix is set automatically. The last 3 octets should be set manually.

However, administrators can set any MAC address to their virtual machines.


Example MACs generated

  • 00:50:56:11:22:33
  • 00:50:56:12:23:34
  • 00:50:56:33:A1:BB

Tested on

  • VMware vSphere 5.5, standalone
  • VMware VMware Workstation 15

Detection Rule 2

Affects products: VMware vSphere managed by vCenter Server

Signature: MAC address belongs to the range [00:50:56:80:00:00; 00:50:56:BF:FF:FF]


According to the VMware OUI allocation scheme, a MAC address has the format of 00:50:56:XX:YY:ZZ, where 00:50:56 represents the VMware OUI, XX is calculated as (80 + vCenter Server ID), and YY and ZZ are random two-digit hexadecimal numbers.

Based on this scheme, we can determine the vCenter Server Unique ID, from the servers' MAC address: Amd fx 8150 driver.

  • Take the 4th octet: for 00:50:56:97:12:34, it would be 97
  • Subtract 0x80: 0x97 - 0x80 = 0x17
  • Rebase it from Base-16 to to Base-10. In our example, it would be 0x17 → 23
  • vCenter Server Unique ID = 23


Example MACs generated

  • 00:50:56:A5:12:34
  • 00:50:56:A5:A0:12
  • 00:50:56:90:A4:BA

Tested on

  • vCenter Server 5.5, 6.5

Detection Rule 3

Affects products: Standalone VMware vSphere, VMware Workstation, VMware Horizon

Signature: OUI is 00:0C:29


According to the VMware OUI allocation scheme, the hypervisor generates MAC addresses that consists of the VMware OUI 00:0C:29 and the last three octets of the virtual machine UUID in hexadecimal format. The virtual machine UUID is based on a hash calculated by using the UUID of the ESXi physical machine and the path to the configuration file (.vmx) of the virtual machine.


Example MACs generated

  • 00:0C:29:4E:C6:49
  • 00:0C:29:49:92:99
  • 00:0C:29:5C:F3:BA

Tested on

  • vSphere 5.5, 6.5, VMware Workstation 15

Detection Rule 4

Affects products: Outdated VMWare solutions: VMware ESX, VMware GSX Server

Signature: OUI is 00:05:69

Vmware Mac Address Change


According to the VMware OUI allocation scheme, the hypervisor generates MAC addresses that consists of the VMware OUI 00:05:69 and the last three octets generated by the following algorithm:

  • The first 16 bits are set to the same values as the last 16 bits of the console operating system’s primary IP address.
  • The final eight bits of the MAC address are set to a hash value based on the name of the virtual machine’s configuration file.
Vm Manual Mac Address

For example, if a machine's IP address was (or in hex, 0xc0220e51) and the configuration file was hashed to the value of 95, the MAC address would have the following value: 00:05:69:0e:51:95


Vmware Mac Address

Example MACs generated

  • 00:05:69:0e:51:95

Detection Rule 5

Affects products: VMware products

Signature: OUI is 00:1C:14

Vm Manual Mac Address Windows 10


Example MACs generated

  • 00:1C:14:00:11:22

Virtual Machine’s MAC ranges

Virtual Machine Mac Address

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