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IP Reserved, Loopback and Private Addresses
(Page 3 of 3)
Reserved, Loopback and Private Addressing Blocks
Table 47
shows all of the special blocks set aside from the normal IP address
space in numerical order, with a brief explanation of how each is used:
Table 47: Reserved, Loopback and Private IP Addresses
Range
Start Address
|
Range
End Address
|
Classful
Address Equivalent
|
Classless
Address Equivalent
|
Description
|
0.0.0.0
|
0.255.255.255
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Class A network
0.x.x.x
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0/8
|
Reserved.
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10.0.0.0
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10.255.255.255
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Class
A network 10.x.x.x
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10/8
|
Class
A private address block.
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127.0.0.0
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127.255.255.255
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Class A network
127.x.x.x
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127/8
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Loopback address
block.
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128.0.0.0
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128.0.255.255
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Class
B network 128.0.x.x
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128.0/16
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Reserved.
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169.254.0.0
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169.254.255.255
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Class B network
169.254.x.x
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169.254/16
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Class B private
address block reserved for automatic private address allocation. See
the section on DHCP for details.
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172.16.0.0
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172.31.255.255
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16
contiguous Class B networks from 172.16.x.x through 172.31.x.x
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172.16/12
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Class
B private address blocks.
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191.255.0.0
|
191.255.255.255
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Class B network
191.255.x.x
|
191.255/16
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Reserved.
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192.0.0.0
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192.0.0.255
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Class
C network 192.0.0.x
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192.0.0/24
|
Reserved.
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192.168.0.0
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192.168.255.255
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256 contiguous
Class C networks from 192.168.0.x through 192.168.255.x
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192.168/16
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Class C private
address blocks.
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223.255.255.0
|
223.255.255.255
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Class
C network 223.255.255.x
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223.255.255/24
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Reserved.
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I have shown both the classful
and classless
notation representing each of these blocks.
This is both because the Internet now uses classless
addressing, and because some of the private
blocks don't correspond to single class A, B or C networks. Note especially
the private address block from 192.168.0.0 to 192.168.255.255. This
is the size of a class B network, but it isn't class B
in the classful scheme, because the first octet of 192
puts it in the class C part of the address space. It is in fact 256
contiguous class C networks.
You may also notice the special class
B (/16) block 169.254.x.x. This is reserved for Automatic Private
IP Addressing (APIPA). Systems that are configured to use this feature
will automatically assign systems addresses from this block to enable
them to communicate even if no server can be found for proper
IP address assignment using DHCP. This is described in a
special topic in the
section describing DHCP.
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Version 3.0 - Version Date: September 20, 2005
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