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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.
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.
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 ...
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.
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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A Class B network was a network in which all addresses had the two most-significant bits set to 1 and 0 respectively. 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.
APIPA assigns an address in the 169.254.0.1 - 169.254.255.254 range. They may be able to see IP resources on their immediate network, but accessing or being seen from outside is not a possibility... Small correction: The address range used for Zeroconf is 169.254.1.0 till 169.254.254.255, both the first and last 256 addresses must not be used.