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- Q1245638 subject Q7348565.
- Q1245638 subject Q8551595.
- Q1245638 subject Q9428830.
- Q1245638 abstract "In the IPv4 address space certain address blocks are specially allocated or reserved for special uses such as loopback interfaces, private networks (RFC 1918), and state-less autoconfiguration (Zeroconf, RFC 3927) of interfaces. Such addresses may be used without registration or allocation from Regional Internet Registries (RIRs). However, these address ranges must not be routed into the public Internet infrastructure.The netmask is a bitmask that can be used to separate the bits of the network identifier from the bits of the host identifier. It is often written in the same notation used to denote IP addresses.Not all sizes of prefix announcement may be routable on the public Internet: see routing, peering.The blocks numerically at the start and end of classes A, B and C were originally reserved for special addressing or future features, i.e., 0.0.0.0/8 and 127.0.0.0/8 are reserved in former class A; 128.0.0.0/16 and 191.255.0.0/16 were reserved in former class B but are now available for assignment; 192.0.0.0/24 and 223.255.255.0/24 are reserved in former class C.While the 127.0.0.0/8 network is a Class A network, it is designated for loopback and cannot be assigned to a network.See (RFC 5735 Special Use IPv4 Addresses)In common usage, the "host all zeros" address is reserved for referring to the entire network, while the "host all ones" address is used as a broadcast address in the given subnet; this reduces the number of addresses available for hosts by 2. This explains the reference to /31 networks as "Rarely Used," as the only possible addresses on a /31 network are "host all ones" and "host all zeros." RFC 3021 creates an exception to the "host all ones" and "host all zeros" broadcast usage to make /31 networks usable for point-to-point links. In practice, however, point-to-point links are still typically implemented using /30 networks, or occasionally by /32 and point-to-point explicit host routes. There is generally no technical advantage to /31 versus /32, although one or the other may be more convenient based on other issues. A /30 is always wasteful and has as its sole advantage that it behaves "as expected" for any other subnetwork.".
- Q1245638 wikiPageWikiLink Q11103.
- Q1245638 wikiPageWikiLink Q11135.
- Q1245638 wikiPageWikiLink Q11186.
- Q1245638 wikiPageWikiLink Q11371.
- Q1245638 wikiPageWikiLink Q11381.
- Q1245638 wikiPageWikiLink Q11414.
- Q1245638 wikiPageWikiLink Q1568763.
- Q1245638 wikiPageWikiLink Q1758736.
- Q1245638 wikiPageWikiLink Q22725.
- Q1245638 wikiPageWikiLink Q242540.
- Q1245638 wikiPageWikiLink Q2644155.
- Q1245638 wikiPageWikiLink Q463080.
- Q1245638 wikiPageWikiLink Q591605.
- Q1245638 wikiPageWikiLink Q5973287.
- Q1245638 wikiPageWikiLink Q646589.
- Q1245638 wikiPageWikiLink Q7348565.
- Q1245638 wikiPageWikiLink Q772532.
- Q1245638 wikiPageWikiLink Q8551595.
- Q1245638 wikiPageWikiLink Q8805.
- Q1245638 wikiPageWikiLink Q9428830.
- Q1245638 comment "In the IPv4 address space certain address blocks are specially allocated or reserved for special uses such as loopback interfaces, private networks (RFC 1918), and state-less autoconfiguration (Zeroconf, RFC 3927) of interfaces. Such addresses may be used without registration or allocation from Regional Internet Registries (RIRs).".
- Q1245638 label "IPv4 subnetting reference".