IP Address

Just abit of code that I was playing with, what I basically want it to do is check a users ip against my ip table and if it is the first time the user visits the site capture the ip and display a message, if it's a known ip do something else and not capture it. When I run that code it captures the ip even if it is already in my table.

Language: PHP
        $ip = $_SERVER[';REMOTE_ADDR';];
	$ip_query = "SELECT ip_address FROM ip";
	$result = mysql_query($ip_query);
	while ($row = mysql_fetch_array($result)){
	$known_ip = $row[';ip_address';];
 
if ($ip != $known_ip) {
	$ip_insert = "INSERT INTO ip (ip_address) VALUES (';$ip';)";
        $result2 = mysql_query($ip_insert);
	echo "Unknown IP";
} else {
 
	}

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