multiple IP routers

Each address range is managed by the Internet Address Number Authority (IANA). Due to
the limited number of multicast addresses, there are very strict requirements for new assignments
within this address space. The 239.0.0.0–239.255.255.255 range is equivalent in purpose
to the private networks defined by RFC 1918.
The difference between the IP multicast ranges of 224.0.0.0–224.0.0.255 and 224.0.1.0–
224.0.1.255 is that addresses in the first range will not be forwarded by an IP router. Both ranges
of addresses are used by applications and network protocols. The first group, classified as locallink,
is meant to remain local to the subnet or broadcast domain on which the system resides. The
second group is a global address that can be routed and forwarded across multiple IP routers.