Dahua HCVR5104C User Manual page 417

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

Cannot 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.
Figure 4- 130
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