Hikvision operates regional service portals. For example:
Enter the device's IP address in your browser's address bar. Log in with your admin credentials. Configuration System Settings The serial number will be listed under Device Information Hikvision Serial Number Check Online
The serial number is a unique alphanumeric identifier (typically 9–11 characters) found on: Hikvision operates regional service portals
(often one letter followed by eight digits) found within a longer sequence on the device label. How to Check / Find Device Serial Number : Hikvision Portal Hikvision Serial Number Check Online