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Denote Networks Using CIDR An IPv6 network is identified using the first host address in the network and the network prefix size in bits The two identifiers are separated by a slash For example, the IPv6 network:
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2001:300:4136:e378::/64
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incorporates the network that begins at address:
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and terminates at address:
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Denote Hosts with a 128-Bit Length To distinguish a single host, add a slash and 128 For example:
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Enclose IPv6 Addresses in URLs in Brackets In a URL, the IPv6 address is enclosed in brackets For example:
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http://[ 2001:300:4136:e378:3000:3dd3:3f56:ffa4]/
This notation allows parsing a URL without confusing the IPv6 address and port number:
http://[ 2001:300:4136:e378:3000:3dd3:3f56:ffa4]:443/
For more information, see RFC 2732 Format for Literal IPv6 Addresses in URLs and RFC 3986 Uniform Resource Identifier (URI): Generic Syntax Write IPv6 Networks Using CIDR Notation IPv6 addresses use CIDR subnetting, alleviating the rigid class system that can interfere with the practical partitioning of address spaces and artificially inflate an address block Using CIDR allows for routing prefix aggregation, also known as summarization or supernetting, where multiple continuous address blocks are advertised as one Compatible Addresses IPv6 hosts will continue to communicate with devices that offer only IPv4 Compatible addresses enable communication crossover between the two implementations if fed into a translation mechanism: IPv4-compatible address The IPv4-compatible address 0:0:0:0:0:0: wxyz or ::wxyz (where wxyz is the dotted-decimal representation of an IPv4 address) is used by IPv6/IPv4 nodes that are communicating using IPv6 IPv6/IPv4 nodes have both IPv4 and IPv6 protocols When the IPv4-compatible address is used as an IPv6 destination, the IPv6 traffic is automatically encapsulated with an IPv4 header and sent to the destination using the IPv4 infrastructure ::/96 the zero prefix is used for IPv4compatible addresses (see Tunneling and Transition Mechanisms )
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IPv4-mapped address The IPv4-mapped address 0:0:0:0:0:FFFF:wxyz or :: FFFF:wxyz is used to represent an IPv4-only node to an IPv6 node It is used only for internal representation The IPv4-mapped address is never used as a source or destination address of an IPv6 packet The ::ffff:0:0/96 prefix is used for IPv4-mapped addresses (see Tunneling and Transition Mechanisms ) 6to4 address The 6to4 address is used for communication between two nodes running both IPv4 and IPv6 over an IPv4 routing infrastructure The 6to4 address is formed by combining the prefix 2002::/16 with the 32 bits of a public IPv4 address, forming a 48-bit prefix This tunneling technique is described further in RFC 3056
Other Special Addresses There are a number of addresses with special meaning in IPv6: ::/128 The address with all zeroes is an unspecified address, and is only to be used in software ::1/128 or 0000:0000:0000:0000:0000:0000:0000:0001 The loopback address of the local host If an application in a host sends packets to this address, the IPv6 stack will loop these packets back to the same host (corresponding to 127001 in IPv4) Remember, the /128 prefix length indicates a host address 2001:db8::/32 This prefix is used in documentation (per RFC 3849) Anywhere that an example IPv6 address is given, addresses from this prefix should be used fc00::/7 Unique local IPv6 unicast addresses are only routable within a set of cooperating sites They were defined in RFC 4193 as a replacement for site-local addresses (see the following section) The addresses include a 40-bit pseudorandom number that minimizes the risk of conflicts if sites merge or packets somehow leak out fe80::/10 The link-local prefix specifies that the address only is valid in the local physical link This is analogous to the APIPA address 169254xx in IPv4 ff00::/8 The multicast prefix is used for multicast addresses 3FFE::/16 These addresses were for the 6Bone test network, which shut down in June 2006 Addresses in this network are not valid
There are no address ranges reserved for broadcast in IPv6 applications are supposed to use multicast to the all-hosts group instead NOTE If you want more information on the IPv6 addressing architecture, or if you just need a good read, check out RFC 4291 IP Version 6 Addressing Architecture
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