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topic : IPv4 multicast addresses as per IANA docs

Is it possible to register these addresses or they are reserved like 0.0.0.0/8, 10.0.0.0/8, 127.0.0.0/24, etc... ?

When we read a specific multicast group is used by a software/vendor, is it possible the vendor is the owner of the address space including the multicast ip, or never possible ?

NOTE : I don't want to register one.

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There are certain blocks of multicast address space reserved for certain things. For example, the 224.0.0.0/24 block is reserved for local network control (Link-Local), and multicast addresses in this block should not be forwarded to another LAN, even with multicast routing enabled.

See the IANA IPv4 Multicast Address Space Registry and IPv6 Multicast Address Space Registry.

The Ad-Hoc blocks are used to register/reserve addresses for various functions, but it requires "Expert Review, IESG Approval, or Standards Action." Basically, you need to get a consensus. The best way would be to get an RFC approved, but notice that some companies have registered multicast address space. For example, 224.0.19.0-224.0.19.63 is registered to the Walt Disney Company.

  • I understand your good answer. But I don't understand why whois.arin.net/rest/ip/224.0.19.0.txt says "IANA Special Use" and not "Walt Disney Company" as per IANA IPv4 Multicast Address Space Registry – Massimo May 1 '17 at 13:47
  • Please : except this block "Local Network Control Block (224.0.0.0 - 224.0.0.255 (224.0.0/24))", IP into all the other blocks can be registered as public ? – Massimo May 1 '17 at 13:51
  • The Ad-Hoc blocks are the ones designed to be registered. You could register something in Local Network Control, or Internetwork Control if you get a consensus for those types of protocols. For example, creating a new routing protocol that uses multicast, you could register addresses in the Internetwork Control Block. – Ron Maupin May 1 '17 at 13:58
  • The whois is only telling you that the address belongs to IANA because multicast cannot be used across the public Internet. – Ron Maupin May 1 '17 at 14:00
  • Ron, I don't understand "multicast cannot be used across the public internet". Multicast is used across internet, for example with the Mbone – Massimo May 1 '17 at 14:02

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