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IANA (Internet Assigned Numbers Authority) is responsible for global coordination of the Internet Protocol addressing systems.
Currently there are two types of Internet Protocol (IP) addresses in active use: IP version 4 (IPv4) and IP version 6 (IPv6)
IPv4 was initially deployed on 1 January 1983 and is still the most commonly used version
IPv4 addresses are 32-bit numbers often expressed as 4 octets in "dotted decimal" notation (for example, 192.0.2.53)
Deployment of the IPv6 protocol began in 1999.
IPv6 addresses are 128-bit numbers and are conventionally expressed using hexadecimal strings