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  2. Reserved IP addresses - Wikipedia

    en.wikipedia.org/wiki/Reserved_IP_addresses

    Reserved IP addresses. ... have reserved various Internet Protocol (IP) addresses for special purposes. ... Reserved for future use [12] (former Class E network)

  3. Classful network - Wikipedia

    en.wikipedia.org/wiki/Classful_network

    The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits. Classes A, B, and C provide unicast addresses for networks of three different network sizes. Class D is for multicast networking and the class E address range is reserved for future or experimental ...

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

    en.wikipedia.org/.../8_IPv4_address_blocks

    Starting 1991-06-01, was used to map Public Data Network addresses to IP addresses. Returned to IANA 2008-01-22. This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information. [10] 15.0.0.0/8 ARIN: 1991-09

  5. Private network - Wikipedia

    en.wikipedia.org/wiki/Private_network

    IP packets originating from or addressed to a private IP address cannot be routed through the public Internet. Private addresses are often seen as enhancing network security for the internal network since use of private addresses internally makes it difficult for an external host to initiate a connection to an internal system.

  6. IP address - Wikipedia

    en.wikipedia.org/wiki/IP_address

    A public IP address is a globally routable unicast IP address, meaning that the address is not an address reserved for use in private networks, such as those reserved by RFC 1918, or the various IPv6 address formats of local scope or site-local scope, for example for link-local addressing. Public IP addresses may be used for communication ...

  7. Multicast address - Wikipedia

    en.wikipedia.org/wiki/Multicast_address

    IP multicast address Description Routable 224.0.0.0 Base address (reserved) No 224.0.0.1 The All Hosts multicast group addresses all hosts on the same network segment. No 224.0.0.2 The All Routers multicast group addresses all routers on the same network segment. No 224.0.0.4

  8. Link-local address - Wikipedia

    en.wikipedia.org/wiki/Link-local_address

    The Internet Engineering Task Force (IETF) has reserved the IPv4 address block 169.254.0.0 / 16 (169.254.0.0 – 169.254.255.255) for link-local addressing. [1] The entire range may be used for this purpose, except for the first 256 and last 256 addresses (169.254.0.0 / 24 and 169.254.255.0 / 24), which are reserved for future use and must not be selected by a host using this dynamic ...

  9. IPv4 - Wikipedia

    en.wikipedia.org/wiki/IPv4

    Previously, every link needed to dedicate a / 31 or / 30 subnet using 2 or 4 IP addresses per point-to-point link. When a link is unnumbered, a router-id is used, a single IP address borrowed from a defined (normally a loopback) interface. The same router-id can be used on multiple interfaces.