Reserved Ip Addresses; Private Ip Networks; Ip Address Conventions - Lucent Technologies PortMaster 4 Configuration Manual

Network Addressing
Class E Addresses
The class E IP address is reserved for future use. In class E addresses, the 4 highest-order
bits are set to 1, 1, 1, and 1. Routers currently ignore class E IP addresses.

Reserved IP Addresses

Some IP addresses are reserved for special uses and cannot be used for host addresses.
Table A-2 lists ranges of IP addresses and shows which addresses are reserved, which are
available to be assigned, and which are for broadcast.
Table A-2
Class
A
B
C
D
E

Private IP Networks

RFC 1597 reserves three IP network addresses for private networks. The addresses
10.0.0.0/8, 192.168.0.0/16, and 172.16.0.0/20 can be used by anyone for setting up
their own internal IP networks.

IP Address Conventions

If the bits in the host portion of an address are all 0, that address refers to the network
specified in the network portion of the address. For example, the class C address
192.31.7.0 refers to a particular network. Historically, this address was used as a
broadcast.
A-4
Reserved and Available IP Addresses
IP Address
0.0.0.0
1.0.0.0 through 126.0.0.0
127.0.0.0
128.0.0.0
128.1.0.0 through 191.254.255.255
191.255.0.0
192.0.0.0
192.0.1.0 through 223.255.254.255
223.255.255.0
224.0.0.0 through 239.255.255.255
240.0.0.0 through 255.255.255.254
255.255.255.255
Status
Reserved
Available
Loopback networks on
the local host
Reserved
Available
Reserved
Reserved
Available
Reserved
Multicast group
addresses
Reserved
Broadcast
PortMaster 4 Configuration Guide