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$ perl -e 'printf "::FFFF".":%X%X"x2, split /\./, shift' 64.233.165.100
$ echo 64.233.165.100 | perl -ne 'printf+join(":%X%X"x2,::FFFF,$/),split/\./'
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sub get_ipv6_from_ipv4 {
my ($ipv4) = @_;
my @numbers = split /\./, $ipv4;
my $ipv6 = sprintf(
'0:0:0:0:0:FFFF:%X%X:%X%X',
@numbers,
);
return $ipv6;
}
say get_ipv6_from_ipv4('64.233.165.100');
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