3Com 4210 PWR Configuration Manual page 193

Class D IP addresses range from 224.0.0.0 to 239.255.255.255. For details, see
Table 142.
Table 142 Range and description of Class D IP addresses
Class D address range
224.0.0.0 to 224.0.0.255
224.0.1.0 to 231.255.255.255
233.0.0.0 to 238.255.255.255
232.0.0.0 to 232.255.255.255
239.0.0.0 to 239.255.255.255
As specified by IANA, the IP addresses ranging from 224.0.0.0 to 224.0.0.255 are
reserved for network protocols on local networks. Table 143 lists commonly used
reserved IP multicast addresses:
Table 143 Reserved IP multicast addresses
Class D address
range
224.0.0.1
224.0.0.2
224.0.0.3
224.0.0.4
224.0.0.5
224.0.0.6
224.0.0.7
224.0.0.8
224.0.0.9
224.0.0.11
224.0.0.12
224.0.0.13
224.0.0.14
224.0.0.15
224.0.0.16
224.0.0.17
224.0.0.18
224.0.0.19 to
224.0.0.255
n
Like having reserved the private network segment 10.0.0.0/8 for unicast, IANA has
also reserved the network segment 239.0.0.0/8 for multicast. These are
administratively scoped addresses. With the administratively scoped addresses,
you can define the range of multicast domains flexibly to isolate IP addresses
between different multicast domains, so that the same multicast address can be
used in different multicast domains without causing collisions.
Description
Reserved multicast addresses (IP addresses for permanent
multicast groups). The IP address 224.0.0.0 is reserved.
Other IP addresses can be used by routing protocols.
Available any-source multicast (ASM) multicast addresses
(IP addresses for temporary groups). They are valid for the
entire network.
Available source-specific multicast (SSM) multicast group
addresses.
Administratively scoped multicast addresses, which are
for specific local use only.
Description
Address of all hosts
Address of all multicast routers
Unassigned
Distance vector multicast routing protocol (DVMRP) routers
Open shortest path first (OSPF) routers
Open shortest path first designated routers (OSPF DR)
Shared tree routers
Shared tree hosts
RIP-2 routers
Mobile agents
DHCP server/relay agent
All protocol independent multicast (PIM) routers
Resource reservation protocol (RSVP) encapsulation
All core-based tree (CBT) routers
The specified subnetwork bandwidth management (SBM)
All SBMS
Virtual router redundancy protocol (VRRP)
Other protocols
Multicast Architecture 191