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my $hashIPs = {}; 
$hashIPs->{$ip} = { totalVulns => $ipTotalVulns, vulns => $vulns };   
+ 
$hashIPs->{$ip}->{'region'} = $region;

Or without references : 
my %hashIPs;
$hashIPs{$ip} = { totalVulns => $ipTotalVulns, vulns => $vulns };    
$hashIPs{$ip}{'region'} = $region;