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The result uses CIDR notation and can be used by an administrator to block a range of IP addresses. The template can be used by editing any page, inserting the template, and previewing the result. There is no need to save the edit.
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
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.
Ranges There are two types of IP ranges CIDR ranges, e.g. 123.123.123.0/24; Non-CIDR ranges; The latter are frequently found in the allocation of IP-address ranges by for instance a provider to a customers or DHCP allocated addresses for certain purposes, as can be found by querying the WHOIS dataase of a RIR.
These groups, commonly called CIDR blocks, share an initial sequence of bits in the binary representation of their IP addresses. IPv4 CIDR blocks are identified using a syntax similar to that of IPv4 addresses: a dotted-decimal address, followed by a slash, then a number from 0 to 32, i.e., a.b.c.d / n. The dotted decimal portion is the IPv4 ...
IP addresses in dot-decimal notation are also presented in CIDR notation, in which the IP address is suffixed with a slash and a number, used to specify the length of the associated routing prefix. For example, 127.0.0.1/8 specifies that the IP address has an eight-bit routing prefix, and therefore the subnet mask 255.0.0.0 .
The two things my tool does (that the Special:CheckUser tool does not, is it semi-smartly tries to identify subranges (if you input a lot of IPs over numerous CIDR ranges), and it supports IPv6 addresses. (Also supports ipv4 ranges but I'm not sure how useful that is) NativeForeigner Talk 22:45, 6 October 2015 (UTC)
If an ISP deploys a CGN and uses private Internet address space [2] (networks 10.0.0.0 / 8, 172.16.0.0 / 12, 192.168.0.0 / 16) to connect their customers, there is a risk that customer equipment using an internal network in the same range will stop working.