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:param addr: An IPv6 address in presentation (string) format.
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:return: ``True`` if IPv6 address is valid, ``False`` otherwise.
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:param addr: An IPv6 address in string form.
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:param int_val: An unsigned integer.
:param dialect: (optional) a Python class defining formatting options.
:return: The IPv6 presentation (string) format address equivalent to the
unsigned integer provided.
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:param int_val: An unsigned integer.
:return: The reverse DNS lookup for an IPv6 address in network byte
order integer form.
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:param int_val: the integer to be packed.
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:param packed_int: a packed string containing an unsigned integer.
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:return: An unsigned integer equivalent to value of network address
represented by packed binary string.
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