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sub ip_to_key { sprintf "%03d", split /\./, $_[0] }

my @sortedKeys =
    sort { ip_to_key($ipaddr{$a}) cmp ip_to_key($ipaddr{$b}) }
    keys %ipaddr;

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my @sortedKeys =
    map substr($_, 4),
    sort
    map pack('C4', split(/\./, $ipaddr{$_})) . $_,
    keys %ipaddr;