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Private network Used for local communications within a private network [3] 100.64.0.0/10 100.64.0.0–100.127.255.255 4 194 304: Private network Shared address space [4] for communications between a service provider and its subscribers when using a carrier-grade NAT: 127.0.0.0/8 127.0.0.0–127.255.255.255 16 777 216: Host Used for loopback ...
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.
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.
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.
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.
Reserved private IPv4 network ranges [2]; Name CIDR block Address range Number of addresses Classful description ; 24-bit block: 10.0.0.0/8: 10.0.0.0 – 10.255.255.255: 16 777 216: Single Class A
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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 ...