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Used for loopback addresses to the local host [1] 169.254.0.0/16 169.254.0.0–169.254.255.255 65 536: Subnet Used for link-local addresses [5] between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server 172.16.0.0/12 172.16.0.0–172.31.255.255 1 048 576: Private ...
Each / 8 block contains 256 3 = 2 24 = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address. This means that 256 /8 address blocks fit into the entire IPv4 space. As IPv4 address exhaustion has advanced to its final stages, some organizations, such as Stanford University, formerly using 36.0.0 ...
Addresses can also be entered in a single argument. {{blockcalc|Any text that includes IPv4 and/or IPv6 addresses.}} Addresses are extracted from the arguments, so any text can be used. {{blockcalc|1=Any text with = that includes IPv4 and/or IPv6 addresses.}} Use 1= if the text contains "=". The following optional parameters can be used. |ok
A special case of private link-local addresses is the loopback interface. These addresses are private and link-local by definition since packets never leave the host device. IPv4 reserves the entire class A address block 127.0.0.0 / 8 for use as private loopback addresses. IPv6 reserves the single address ::1.
Three non-overlapping ranges of IPv4 addresses for private networks are reserved. [8] ... 1 048 576: Contiguous range of 16 Class B blocks 16-bit block: 192.168.0.0/16:
For these networks, the network address was given by the next 14 bits of the address, thus leaving 16 bits for numbering host on the network for a total of 65 536 addresses per network. Class C was defined with the 3 high-order bits set to 1, 1, and 0, and designating the next 21 bits to number the networks, leaving each network with 256 local ...
In a /28 subnet, e.g. 1.2.3.192/28, the reserved addresses would be 1.2.3.192 and 1.2.3.207, with the latter being the subnet broadcast address. In a /16 subnet in turn, that means that .0.0 and .255.255 are automatically reserved, with .255.255 being the broadcast address for the subnet.
The document goes on to list the remaining Class A networks of 44 through 126 as unassigned and 127 as reserved. It lists all Class B networks except 128.000 and 192.255 as unassigned and list those two as reserved. Similarly, it lists the Class C networks of 192.000.001 and 223.255.255 as reserved and the ones in between as unassigned.