10G Core Routing Switch User Manual
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Where, Class A, Class B and Class C are unicast addresses, while Class D addresses are multicast ones and class E addresses are reserved
for special applications in future. The first three types are commonly used.
The IP address is in dotted decimal format. Each IP address contains 4 integers in dotted decimal notation. Each integer corresponds to
one byte, e.g.10.110.50.101.
When using IP addresses, it should also be noted that some of them are reserved for special uses, and are seldom used. The IP
addresses you can use are listed in the following table.
Table
IP address classes and ranges
Network
class
Address
range
IP network
range
Note
A
0.0.0.0 to
127.255.255.255
1.0.0.0 to
126.0.0.0
Host ID with all the digits being 0 indicates that the IP
address is the network address, and is used for
network routing.
Host ID with all the digits being 1 indicates the
broadcast address, i.e.broadcast to all hosts on the
network.
IP address 0.0.0.0 is used for the host that is not put
into use after starting up.
The IP address with network number as 0 indicates
the current network and its network can be cited by
the router without knowing its network number.
Network ID with the format of 127.X.Y.Z is reserved
for self-loop test and the packets sent to this address
will not be output to the line. The
packets are processed internally and regarded as
input packets.
B
128.0.0.0 to
191.255.255.255
128.0.0.0 to
191.254.0.0
Host ID with all the digits being 0 indicates that the IP
address is the network address, and is used for
network routing.
Host ID with all the digits being 1 indicates the
broadcast address, i.e.broadcast to all hosts on the
network.
C
192.0.0.0 to
223.255.255.255
192.0.0.0 to
223.255.254.0
Host ID with all the digits being 0 indicates that the IP
address is the network address, and is used for
network routing.
Host ID with all the digits being 1 indicates the
broadcast address, i.e.broadcast to all hosts on the
network.
D
224.0.0.0 to
239.255.255.255
None
Addresses of class D are multicast addresses.
E
240.0.0.0 to
255.255.255.254
None
The addresses are reserved for futureuse.
Other
addresses
255.255.255.255
255.255.255.255
255.255.255.255 is used as LAN broadcast address.
