CTI Janus Programmable Automation Controller IOG
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Selecting a Multicast Address
The address range of 239.0.0.0 thru 239.255.255.255 has been designated as an administratively scoped Multicast
Address space (RFC 2365). Addresses in this range are designated for use by private multicast domains. They do
not conflict with other multicast address spaces that are explicitly assigned by Internet Assigned Numbers
Authority (IANA). Within this range, addresses 239.255.0.0 thru 239.255.255.255 are designated for the IPV4
multicast local scope.
If you are choosing a Multicast Address for a new factory floor application, you should choose a Multicast
Address in the IPV4 local scope range (239.255.0.0 thru 239.255.255.255) unless you have a specific reason to do
otherwise. You should verify there is no conflict with other Multicast Addresses being used locally.
In case you are using the Janus controller in an existing multicast application that uses a Multicast Address outside
of the administratively scoped address space, the configuration program allows you to enter the complete range of
assignable multicast addresses (224.0.0.1 thru 239.255.255.255).
For a current list of IANA assigned multicast addresses, see the IANA website:
www.iana.org/assignments/multicast-addresses/
