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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 1 048 576: Private network Used for local communications within a private network [3] 192.0.0.0/24 192.0.0.0–192.0.0.255 256
RFC 1918 – Address Allocation for Private Internets; RFC 2036 – Observations on the use of Components of the Class A Address Space within the Internet; RFC 7020 – The Internet Number Registry System; RFC 2101 – IPv4 Address Behaviour Today; RFC 2663 – IP Network Address Translator (NAT) Terminology and Considerations
RFC 1918 : Address Allocation for Private Internets: February 1996: Private network: RFC 1928 : SOCKS Protocol Version 5: March 1996: SOCKS5: RFC 1939 : Post Office Protocol - Version 3: May 1996: POP v 3: RFC 1945 : Hypertext Transfer Protocol—HTTP/1.0: May 1996: HTTP v 1.0: RFC 1948 : Defending Against Sequence Number Attacks: May 1996: IP ...
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 Various registries (maintained by ARIN).
The IP address of a public server is also important, similar in global uniqueness to a postal address or telephone number. Both IP address and port number must be correctly known by all hosts wishing to successfully communicate. Private IP addresses as described in RFC 1918 are usable only on private networks not directly connected to the internet.
Link-local addresses may be assigned manually by an administrator or by automatic operating system procedures. In Internet Protocol (IP) networks, they are assigned most often using stateless address autoconfiguration, a process that often uses a stochastic process to select the value of link-local addresses, assigning a pseudo-random address that is different for each session.
There are two primary types of IP addresses in use today: IP version 4 (IPv4) and IP version 6 (IPv6). The former has been around since January 1983 , and is still the most common.
With IPv4, commonly home networks use private addresses (defined in RFC 1918) that are non-routable on the public Internet and use address translation to convert to routable addresses when connecting to hosts outside the local network. Business networks typically had manually provisioned subnetwork prefixes.