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CIDR gave rise to a new way of writing IP addresses known as CIDR notation, in which an IP address is followed by a suffix indicating the number of bits of the prefix. Some examples of CIDR notation are the addresses 192.0.2.0 / 24 for IPv4 and 2001:db8:: / 32 for IPv6.
A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example:
Template {{IPaddr}} is used to make an IP address stand out in the text, to improve readability. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status IP address 1 The IP address to display, either IPv4 or IPv6. An IP address is displayed in italics, using lower case letters for IPv6 addresses. Example 198.51.100.52 or ...
The number of available subnets is 2 n, where n is the number of bits used for the network portion of the address. There is an exception to this rule for 31-bit subnet masks, [ 11 ] which means the host identifier is only one bit long for two permissible addresses.