IPv6 prefix representation by mute

IFS=: read -rax
for i in {0..7};{
v+=$(printf '%04x' $((16#${x[i]})))
}
for ((i=${#v}-1;i>-1;i--));{
printf ${v:i:1}.
}
echo ip6.arpa.

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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