Pfthb

What would be the way to unpack and map to ipv6 address. I'm currently doing the following

In [3]: struct.unpack("!h",'*x00')
Out[3]: (10752,)

In [5]: ipaddress.IPv6Address(10752)
Out[5]: IPv6Address(u'::2a00')

but of course the end result i wish for is 2a00:: , i was expecting IPv6Address to return it but i'm missing something.

What i'm currently doing is unpacking as sting then to hex and append :: .

In [14]: struct.unpack("!2s",'*x00')
Out[14]: ('*x00',)

In [15]: '*x00'.encode("hex")
Out[15]: '2a00'

then append to hex and append 

In [16]: '*x00'.encode("hex")+'::'
Out[16]: '2a00::'

The IP adress converts what we could see as a binary number into a 128-bit representation with hexadecimal numbers (and some other logic to compress zero sequenes).

The number 10752 is equivalent to:

00 00 00 00 00 00 00 (hex)
00 00 00 00 00 2a 00

00000000 00000000 00000000 00000000 00000000 00000000 00000000 (bin)
00000000 00000000 00000000 00000000 00000000 00101010 00000000

or thus with colons in between:

0000:0000:0000:0000:0000:0000:0000:2a00

and this is actually what you get. IPv6 addresses use double colons to strip of sequences of zero.

If we shift the value however 112 places up (128-16), we thus get:

2a 00 00 00 00 00 00 (hex)
00 00 00 00 00 00 00

00101010 00000000 00000000 00000000 00000000 00000000 00000000 (bin)
00000000 00000000 00000000 00000000 00000000 00000000 00000000

which is thus:

2a00:0000:0000:0000:0000:0000:0000:0000

so we can obtain the desired output with:

>>> ipaddress.IPv6Address(10752<<112)
IPv6Address('2a00::')

Note that the above however will only work if the data is less than 2¹⁶=65'536, since otherwise it takes more than 16 bits, and then the value is too large to get represented by an IPv6 address.