my ( $id, $area, $cpu, $ip, $ip2 ) = @{$IpInfo->[0]};
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With what you did, you simply assigned $IpInfo->[0], an array ref to $id. You can prove this by:

use Data::Dumper;

use strict;
use warnings;

my $IpInfo = [
          [
            '20',
            '74',
            '6',
            '55',
            '56'
          ]
        ];
my ( $id, $area, $cpu, $ip, $ip2 ) = $IpInfo->[0];
print Dumper($id);
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Which prints:

$VAR1 = [
          '20',
          '74',
          '6',
          '55',
          '56'
        ];
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And that's what you got earlier when you tried to dump $IpInfo->[0].