Device serial number(SN) is usually consist of nine digits, or one letter + eight digits.
You can find device serial number according to below methods.
For DVR/NVR GUI3.0:
Please enter device local Menu- Maintenance- System Info- Device Info to check device serial number.
For DVR/NVR GUI4.0:
Please enter device local Maintenance- System Info- Device Information to check device serial number.
Please login device via web browser, enter Configuration- System- System Settings to check device serial number.
1.Follow the link to download the latest version of SADP tool on your computer.
2.Use SADP software to automatically search active online devices in the same subnet with the PC running the software, and then select the required device to view its serial number.