Dahua Smart Box Series User Manual page 221

Here you can set a multiple cast group. Please refer to the following sheet for detailed
information.
IP multiple cast group address
-224.0.0.0-239.255.255.255
-"D" address space
The higher four-bit of the first byte="1110"
Reserved local multiple cast group address
-224.0.0.0-224.0.0.255
-TTL=1 When sending out telegraph
-For example
224.0.0.1 All systems in the sub-net
224.0.0.2 All routers in the sub-net
224.0.0.4 DVMRP router
224.0.0.5 OSPF router
224.0.0.13 PIMv2 router
Administrative scoped addressees
-239.0.0.0-239.255.255.255
-Private address space
Like the single broadcast address of RFC1918
Can not be used in Internet transmission
Used for multiple cast broadcast in limited space.
Except the above mentioned addresses of special meaning, you can use other addresses.
For example:
Standalone DVR User's Manual
Figure 4-103
211