Distech ECYPSE - Private Ipv4 Address Ranges; Reserved Host Addresses; Default Gateway

IPv4 Communication Fundamentals
ECLYPSE User Guide 21
true bits set in the subnetwork mask. For example, the subnetwork mask 255.128.0.0 is
11111111 10000000 00000000 00000000 in binary or /9.
An IP address can be expressed with its CIDR subnetwork mask in the form of
192.168.0.0/24 for example.
Private IPv4 Address Ranges
Each IP address class has a private address range. Private IPv4 addresses cannot be
routed over the Internet.
Distech Controls IP controllers will normally be assigned to a private IP address and are
connected to the LAN ports of a router, thereby keeping them behind a firewall from the
internet while allowing them to freely communicate to each other and to other trusted
devices.
The following IPv4 address ranges are reserved for private networks.
Network
Class
IP Address Range
Number of
Addresses
Largest CIDR Block
(subnetwork mask)
A
10.0.0.0 -
10.255.255.255
16,777,216
10.0.0.0/8 (255.0.0.0)
B
172.16.0.0 -
172.31.255.255
1,048,576
172.16.0.0/12 (255.240.0.0)
C
192.168.0.0 -
192.168.255.255
65,536
192.168.0.0/16 (255.255.0.0)
Reserved Host Addresses
The first and the last IP addresses are reserved for special use on all subnetwork IP address
ranges:
The first IP Address is the Network ID. Networks with different network IDs are considered to
be distinct. By default, no direct communication can take place between two networks that
have different Network IDs. This prevents computers on one network from being accessed
by computers on another network. When one department or organization is on one network,
it is segregated from computers on other networks.
Last IP Address is the Broadcast Address: this is used for a specific type of network traffic
that is destined to every host in the subnetwork range of IP addresses. For example, the
device’s DHCP client uses the broadcast address to find the network’s DHCP server.
For Example, with a typical class C private network:
Subnetwork Mask = 255.255.255.0
Network ID = 192.168.1.0
Broadcast Address = 192.168.1.255
Usable IP Addresses = 192.168.1.1 - 192.168.1.254
Default Gateway
Two hosts on the same subnetwork can directly communicate with each other. When a host
wants to communicate to an IP address that is not in the subnetwork address range, the host
sends the packet to the default gateway. The default gateway is usually the router’s IP
address and is usually set in the routers administration interface. For more information about
IP routing, see About Routers, Switches, and Hubs on page 23.
Certain ECLYPSE controller services use the default gateway. See ECLYPSE Services that
Require Internet Connectivity on page 30.