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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
Internet Protocol version 4 (IPv4) ... Used for loopback addresses to the local host [4] ... 1 0 2 1,020 20 1,000 1 185 3 1,500 20 1,480 1
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 ...
IEN 158 [2] 0x10 16 CHAOS Chaos: 0x11 17 UDP User Datagram Protocol: RFC 768: 0x12 18 MUX Multiplexing: IEN 90 [3] 0x13 19 DCN-MEAS DCN Measurement Subsystems 0x14 20 HMP Host Monitoring Protocol: RFC 869: 0x15 21 PRM Packet Radio Measurement 0x16 22 XNS-IDP XEROX NS IDP 0x17 23 TRUNK-1 Trunk-1 0x18 24 TRUNK-2 Trunk-2 0x19 25 LEAF-1 Leaf-1 0x1A ...
The first working version that was widely deployed was assigned version number 4. [10] A separate protocol based on reliable connections was developed and assigned version 5. IP version 7 was chosen in 1988 by R. Ullmann as the next IP version because he incorrectly assumed that version 6 was in use for ST-II.
The address 127.0.0.1 is the standard address for IPv4 loopback traffic; the rest are not supported by all operating systems. However, they can be used to set up multiple server applications on the host, all listening on the same port number. In the IPv6 addressing architecture [3] there is only a single address assigned for loopback: ::1. The ...
The original list of IPv4 address blocks was published in September 1981. [3] In previous versions of the document, [19] [20] network numbers were 8-bit numbers rather than the 32-bit numbers used in IPv4. At that time, three networks were added that were not listed earlier: 42.rrr.rrr.rrr, 43.rrr.rrr.rrr, and 44.rrr.rrr.rrr.
A special case of private link-local addresses is the loopback interface. These addresses are private and link-local by definition since packets never leave the host device. IPv4 reserves the entire class A address block 127.0.0.0 / 8 for use as private loopback addresses. IPv6 reserves the single address ::1.