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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.
They are PTR queries for subdomains of in-addr.arpa (for IPv4 addresses) [3] and ip6.arpa (for IPv6 addresses). [4] 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 ...
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.
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 ...
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.
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 ...
Module:Sensitive IP addresses/summary This template generates a table summarizing IP ranges that Wikipedia considers sensitive . The data for the table comes from Module:Sensitive IP addresses/list .