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Networking Concepts A-5
Network Addressing
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.
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.
Table A-2
Reserved and Available IP Addresses
Class IP Address Status
A 0.0.0.0
1.0.0.0 through 126.0.0.0
127.0.0.0
Reserved
Available
Loopback networks on
the local host
B 128.0.0.0
128.1.0.0 through 191.254.255.255
191.255.0.0
Reserved
Available
Reserved
C 192.0.0.0
192.0.1.0 through 223.255.254.255
223.255.255.0
Reserved
Available
Reserved
D 224.0.0.0 through 239.255.255.255 Multicast group
addresses
E 240.0.0.0 through 255.255.255.254
255.255.255.255
Reserved
Broadcast