For most H.264 DVR systems, the is admin . The password varies by manufacturer, but you can try these common default combinations: Common Default Passwords
If your DVR is from a recognizable brand but still labeled as H.264, the defaults may differ. You can often find these on a sticker at the back of the device. Default Username Default Password admin / 888888 / 123456 Hikvision 12345 (Older) / Set at activation (Newer) Zosi [None] (Leave blank) Defender Set at activation Swann 12345 / 1234 H.264 Default Password - Google Groups h264 dvr login password