BLANKOM HDE-4K5 User Manual
Version 1.0 – 12-2018
Page - 41 -
techn. data are subject to change w/o notice!
Available Formats
Registries included below
Local Network Control Block (224.0.0.0 - 224.0.0.255 (224.0.0/24))
Internetwork Control Block (224.0.1.0 - 224.0.1.255 (224.0.1/24))
AD-HOC Block I (224.0.2.0 - 224.0.255.255)
RESERVED (224.1.0.0-224.1.255.255 (224.1/16))
SDP/SAP Block (224.2.0.0-224.2.255.255 (224.2/16))
AD-HOC Block II (224.3.0.0-224.4.255.255 (224.3/16, 224.4/16))
RESERVED (224.5.0.0-224.251.255.255 (251 /16s))
DIS Transient Groups 224.252.0.0-224.255.255.255 (224.252/14))
RESERVED (225.0.0.0-231.255.255.255 (7 /8s))
Source-Specific Multicast Block (232.0.0.0-232.255.255.255 (232/8))
AD-HOC Block III (233.252.0.0-233.255.255.255 (233.252/14))
Unicast-Prefix-based IPv4 Multicast Addresses
Relative Addresses used with Scoped Multicast Addresses
Multicast (as opposed to unicast) is used to send UDP packets from 1 source to multiple destination
servers. This is useful for example for streaming from a satellite/DVB-T receiver to multiple receiving PCs
for playback. Multicast can also be used on the output of an encoder to feed multiple streaming
servers. Multicast only works with UDP and is not possible with TCP due to the 2 way nature of TCP,
most commonly multicast is used with RTP and MPEG2-TS.
A multicast IP address must be chosen according to IANA information, we recommend using an address in
the range
239.0.0.0 to 239.255.255.255
as this is reserved for private use. Using multicast addresses in
the 224.0.0.0 range may clash with existing services and cause your stream to fail. For more details see
http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xml
Choosing a UDP port number for multicast streams is also important. Even if you use a different
multicast IP for each of your streams, we strongly recommend using different UDP port numbers as well.
This is because a server and all software running on the server receives ALL multicast traffic on an open
port and extra processing is required to filter out the required traffic. If the each stream arrives on a
different port, the server can safely ignore any traffic on ports that are not open. Port numbers MUST be
chosen so that don't clash with any existing services or ephemeral ranges. The ephemeral range for
Windows Vista, 7, 2008 is 49152 to 65535, for older Windows it is 1025 to 5000 and for Linux it is 32768
to 61000. For more information on Windows see
http://support.microsoft.com/kb/929851
also be taken to avoid system ports 0 to 1024. See
http://www.iana.org/assignments/service-names-
port-numbers/service-names-port-numbers.xml
Generally one of the unassigned User Ports (
1024-49151
)
should be used, you can run the
netstat -abn
(as admin under windows) command to see which ports are
currently in use.
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