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``0:0:0:0:0:0:0:0`` (``::`` in compact form) is the unspecified IPv6 address. This is the IPv6 address that a host can use as source address when trying to acquire an official address.
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``0:0:0:0:0:0:0:0`` is represented as ``::``
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``0:0:0:0:0:0:0:1`` (``::1`` in compact form) is the IPv6 loopback address. This is the address of a logical interface that is always up and running on IPv6 enabled hosts.
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``0:0:0:0:0:0:0:1`` is represented as ``::1``
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``00`` : if a node does not recognize this header, it can be safely skipped and the processing continues with the subsequent header
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``01`` : if a node does not recognize this header, the packet must be discarded
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``0`` : No route to destination. This indicates that the router that sent the ICMPv6 message did not have a route towards the packet's destination
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102 or 81 bytes
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``10`` (resp. ``11``) : if a node does not recognize this header, it must return a control packet (ICMP, see later) back to the source (resp. except if the destination was a multicast address)
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``/128`` in the rare case when it is known that no more than one host will be attached
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1500 bytes
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``1`` : Communication with destination administratively prohibited. This indicates that a firewall has refused to forward the packet towards its final destination.
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``1`` : `Destination Unreachable`. Such an ICMPv6 message is sent when the destination address of a packet is unreachable. The `code` field of the ICMP header contains additional information about the type of unreachability. The following codes are specified in :rfc:`4443`
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``2001:0db8:0000:cd30:0000:0000:0000:0000`` / ``60``
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``2001:0db8:0:cd30::`` / ``60``
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``2001:0db8::cd30:0:0:0:0`` / ``60``
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``2001:db8:0:0:8:800:200c:417a``
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``2001:db8:0:0:8:800:200c:417a`` is represented as ``2001:db8::8:800:200c:417a``
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``2001:db8:1234:5678::1`` is assigned to ``router``
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``2001:db8:1234:5678::AA`` is assigned to ``hostA``
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