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2. Wildcard mask - Wikipedia

   en.wikipedia.org/wiki/Wildcard_mask

   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:

3. Subnet - Wikipedia

   en.wikipedia.org/wiki/Subnet

   For example, the subnet mask for a routing prefix that is composed of the most-significant 24 bits of an IPv4 address is written as 255.255.255.0. The modern standard form of specification of the network prefix is CIDR notation, used for both IPv4 and IPv6.

4. Classless Inter-Domain Routing - Wikipedia

   en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

   A subnet mask is a bitmask that encodes the prefix length associated with an IPv4 address or network in quad-dotted notation: 32 bits, starting with a number of 1-bits equal to the prefix length, ending with 0-bits, and encoded in four-part dotted-decimal format: 255.255.255.0. A subnet mask encodes the same information as a prefix length but ...

5. Mask (computing) - Wikipedia

   en.wikipedia.org/wiki/Mask_(computing)

   Therefore, with this mask, network addresses 192.0.2.1 through 192.0.2.255 (192.0.2.x) are processed. Subtract the normal mask from 255.255.255.255 in order to determine the ACL inverse mask. In this example, the inverse mask is determined for network address 198.51.100.0 with a normal mask of 255.255.255.0.

6. List of assigned /8 IPv4 address blocks - Wikipedia

   en.wikipedia.org/wiki/List_of_assigned_/8_IPv4...

   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.

7. Multicast address - Wikipedia

   en.wikipedia.org/wiki/Multicast_address

   A multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service.