IPv6

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In IPv6, the address size has been increased from 32 to 128 bits. The primary difference is not to increase the number of available addresses, but to allow routing nodes a sufficient number of routing prefixes. The readable format of an IPv6 address is broken into eight groups of 4 Hexadecimal digits, with each group representing 16 bits (two octets). An example IP might look like "3ffe:1900:4545:3:200:f8ff:fe21:67cf".

Reserved addresses listed in RFC 5156.

Reserved IPv6 addresses
CIDR Locality Purpose
::/128 Unspecified address
::1/128 Local Used for loopback address to the local host.
::ffff:0:0/96 Local IPv4 mapped addresses
::<ipv4-address>/96 Local IPv4 Compatible Addresses (deprecated)
2001::/32 Global Teredo tunneling
2001:10::/28 Local Overlay Routable Cryptographic Hash Identifiers (ORCHID)
2001:db8::/32 Subnet Addresses used in documentation
2002::/16 Global [1]
fc00::/7 Subnet Unique local address
ff00::/8 Global Multicast

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