The /dlv option stands for "Detailed License View". When used with the slmgr command, it displays detailed information about the license status of your Windows installation. This includes:
Name: Windows(R), Professional edition Description: Windows(R) Operating System, VOLUME_KMSCLIENT channel Activation ID: 2bde3a8e-fdbe-4e1e-9c0d-9d9a8b7f6e5d Application ID: 55c92734-d682-4d71-983e-d6ec3f16059f Partial Product Key: 3V66T License Status: Licensed Remaining Windows rearm count: 1 Remaining SKU rearm count: 1 Trusted Time: 4/14/2026 10:23:45 AM Key Management Service client information: KMS machine name from DNS: kms.contoso.com:1688 KMS machine caching enabled Current KMS count: 25 slmgr /dlv