SMP111 • Reference Information 95
Private and Public Address Ranges
Within each of the classes are a range of addresses designated as "private" addresses.
These are addresses that should only be used on private local networks and intranets and
cannot be accessed directly from the Internet.
• 10.0.0.0 – 10.255.255.255
• 172.16.0.0 – 172.31.255.255
• 169.254.0.0 – 169.254.255.255
• 192.168.0.0 – 192.168.255.255
Addresses outside these ranges are considered "public".
Multicast Address Range
A further range of addresses is available for multicast use:
• 224.0.0.0 – 239.255.255.255
These addresses (also known as class D addresses) are used to allow several devices to be
part of the same multicast group. Each device in the group has the same multicast address
and can effectively send data to all other devices in the same group simultaneously.
The SMP uses 235.111.3.1 as the default multicast address for the RTSP Pull stream.
Subnet Mask
The subnet mask is a 32‑bit binary number used to "mask" certain bits of the IP address. It
extends the number of network options available for the IP address. The subnet mask does
this by allowing part of the host identifier to be used as a subnetwork identifier.
It is important that the correct value is used for the subnet mask. The value of the
subnet mask is dependent on the IP address class being used. Use the table below and
the table in the What is an IP Address? section on the previous page to select the subnet
mask class that matches the IP address class.
Class Subnet Mask
Class A
255.0.0.0
Class B
255.255.0.0
Class C
255.255.255.0
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