MQTT SN Multicast Addresses

Nicholas Humfrey edited this page Jul 1, 2016 · 1 revision

This is a proposal, the addresses have not be peer-reviewed or registered with IANA.

Scope Name MQTT-SN Radius IPv6 Address IPv4 Address
Node-Local 0 FF00:0:0:0:0:0:0:75B (with TTL=0)
Link-Local 1 FF01:0:0:0:0:0:0:75B (with TTL=1)
Realm-Local 3 FF03:0:0:0:0:0:0:75B
Admin-Local 4 FF04:0:0:0:0:0:0:75B
Site-Local 5 FF05:0:0:0:0:0:0:75B
Organization-Local 8 FF08:0:0:0:0:0:0:75B
Global 14 FF0E:0:0:0:0:0:0:75B


  • Addresses use scope relative addressing
  • For IPv6: 0x75B = 1883 in decimal
  • For IPv4: 72 = 255 - 183

Scope Descriptions

The scope descriptions are taken from RFC4291.

  • Node-Local: spans only a single interface on a node and is useful only for loopback transmission of multicast.
  • Link-Local: spans the same topological region as the corresponding unicast scope.
  • Admin-Local: is the smallest scope that must be administratively configured, i.e., not automatically derived from physical connectivity or other, non-multicast-related configuration.
  • Site-Local: is intended to span a single site.
  • Organisation-Local: is intended to span multiple sites belonging to a single organisation.
  • Global: the whole of the internet
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