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3Com Switch 8800 Configuration Guide Chapter 11 IP Address Configuration
11-2
Table 11-1 IP address classes and ranges
Network
class
Address
range
IP network
range
available
Note
A
0.0.0.0 to
127.255.2
55.255
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, that
is, 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 ID being
0 indicates the current network and its
network can be cited by the router
without knowing its network number.
The IP addresses with the format of
127.X.Y.Z are reserved for self-loop
test and the packets sent to these
addresses are not output to the line.
The packets are processed internally
and regarded as input packets.
B
128.0.0.0
to
191.255.2
55.255
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, that
is, broadcast to all hosts on the
network.
C
192.0.0.0
to
223.255.2
55.255
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, that
is, broadcast to all hosts on the
network.