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DHCP Vendor Class Identifiers: MSFT 50 and dhcpcd-5.5.6

Introduction

The DHCP Vendor Class Identifier (VCI) is an optional field in a DHCP request that allows a client to identify its type to a DHCP server. This information can be used by the server to provide specific configuration information to the client.

Two common VCI values for Windows and Android devices are MSFT 50 and dhcpcd-5.5.6, respectively.

MSFT 50

MSFT 50 is the VCI for Microsoft Windows devices. It is used by all versions of Windows from Windows 98 to Windows 10.

Prior to Windows 10, the Client Vendor Name field in the DHCP request was simply set to MSFT 50. However, with the release of Windows 10, Microsoft introduced a new feature called "DHCP Device Classification". This feature allows Windows 10 devices to specify their device type in the DHCP request. The device type is then used by the DHCP server to provide specific configuration information to the device.

The following are the possible device types for Windows 10 devices:

• Desktop
• Laptop
• Tablet
• Server
• IoT device

When a Windows 10 device sends a DHCP request, it will include its device type in the DHCP Vendor Class Identifier field. The VCI will be set to MSFT 50 followed by a period (.) and the device type. For example, a laptop would have a VCI of MSFT 50.Laptop.

dhcpcd-5.5.6

dhcpcd-5.5.6 is the VCI for Android devices. It is used by all versions of Android from Android 5.0 to Android 10.

The dhcpcd-5.5.6 VCI is used to identify Android devices to DHCP servers. This information can be used by the server to provide specific configuration information to the device, such as the IP address range that the device can use.

Conclusion

The DHCP Vendor Class Identifier is a useful field that can be used to identify the type of device that is making a DHCP request. This information can be used by DHCP servers to provide specific configuration information to the device.

MSFT 50 is the VCI for Microsoft Windows devices, while dhcpcd-5.5.6 is the VCI for Android devices.

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