Topics: IP address, IPv6, IPv4 Pages: 2 (339 words) Published: August 7, 2012
IPv4 and IPv6

About ARIN
The American Registry for Internet Numbers (ARIN) is the nonprofit corporation that distributes Internet number resources, including Internet Protocol (IP) addresses, to Canada, many Caribbean and North Atlantic islands, and the United States.

What is Internet Protocol?
Internet Protocol is a set of technical rules that defines how computers communicate over a network. There are currently two versions: IP version 4 (IPv4) and IP version 6 (IPv6).

What are the major differences?
The major difference between IPv4 and IPv6 is the number of IP addresses. There are 4,294,967,296 IPv4 addresses. In contrast, there are 340,282,366,920,938,463,463,374, 607,431,768,211,456 IPv6 addresses. The technical functioning of the Internet remains the same with both versions and it is likely that both versions will continue to operate simultaneously on networks well into the future. To date, most networks that use IPv6 support both IPv4 and IPv6 addresses in their networks.

What is IPv4?
IPv4 was the first version of Internet Protocol to be widely used, and accounts for most of today’s Internet traffic. There are just over 4 billion IPv4 addresses. While that is a lot of IP addresses, it is not enough to last forever.

What is IPv6?
IPv6 is a newer numbering system that provides a much larger address pool than IPv4, amongst other features. It was deployed in 1999 and should meet the world’s IP addressing needs well into the future.

Internet Protocol version 4 (IPv4)
Deployed Address Size Address Format Prefix Notation Number of Addresses 1981 32-bit number Dotted Decimal Notation: 2 = ~4,294,967,296 32

Internet Protocol version 6 (IPv6)
1999 128-bit number Hexadecimal Notation: 3FFE:F200:0234:AB00: 0123:4567:8901:ABCD 3FFE:F200:0234::/48 2128 = ~340,282,366, 920,938,463,463,374, 607,431,768,211,456

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