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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 network Used for local communications within a private network [3] 192.0.0.0/24 192.0.0.0–192.0.0.255 256 ...
The next group of results (the second and third rows) shows an alternative that would affect 768 addresses but would require blocking two ranges, 192.168.249.0/24 and 192.168.250.0/23. The final group of results points out that the four individual IPs could be blocked.
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.
Some large / 8 blocks of IPv4 addresses, the former Class A network blocks, are assigned in whole to single organizations or related groups of organizations, either by the Internet Corporation for Assigned Names and Numbers (ICANN), through the Internet Assigned Numbers Authority (IANA), or a regional Internet registry.
For example, to find the domain name associated with the IP address 203.0.113.22, one would send a PTR query for 22.133.0.203.in-addr.arpa. Misconfigured hosts [ 5 ] often send reverse DNS queries for private addresses to the public DNS.
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There is no link for an IPv6 range because no tool with that ability is known. The result may list several alternatives, starting with a single range. Each alternative covers the given addresses with fewer other IPs affected. By default, IPv4 ranges are not shorter than /16, and IPv6 ranges are not shorter than /19. See {} for documentation ...
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