diff --git a/src/VisitorNickname.php b/src/VisitorNickname.php
index 2180d9d..2fabb64 100644
--- a/src/VisitorNickname.php
+++ b/src/VisitorNickname.php
@@ -68,20 +68,23 @@ class VisitorNickname
     ];
 
     /**
-     * Generate a short deterministic ID suffix from an IP address.
+     * Generate a short deterministic ID suffix from an IP + country.
      *
-     * Same IP always produces the same suffix. Used to distinguish
-     * visitors with the same behavior label.
+     * Format: CC + number (e.g. "PL1", "SG3", "US7").
+     * Same IP always produces the same suffix.
      *
-     * @param string $ip IP address (v4 or v6)
-     * @return string e.g. "K7", "M3" — uppercase letter + digit
+     * @param string $ip          IP address (v4 or v6)
+     * @param string $countryCode 2-letter country code (e.g. "PL")
+     * @return string e.g. "PL1", "SG3"
      */
-    public static function shortId(string $ip): string
+    public static function shortId(string $ip, string $countryCode = ''): string
     {
-        $hash = crc32($ip) & 0xFFFFFFFF;
-        $letter = chr(65 + ($hash % 26)); // A-Z
-        $digit = ($hash >> 5) % 10;       // 0-9
-        return $letter . $digit;
+        $cc = strtoupper(trim($countryCode));
+        if (strlen($cc) !== 2) {
+            $cc = 'XX';
+        }
+        $num = (crc32($ip) & 0xFFFFFFFF) % 100; // 0-99
+        return $cc . $num;
     }
 
     /**
@@ -202,13 +205,14 @@ class VisitorNickname
      *
      * Priority: order > cart > demo download > demo boot > returning visitor > visitor
      *
-     * @param array  $tags  Output of behaviorTags()
-     * @param int    $pages Total pages viewed
-     * @param int    $sessions Number of sessions
-     * @param string $ip   IP address (for unique suffix)
-     * @return string Human-readable label, e.g. "Cart Abandoner #K7"
+     * @param array  $tags        Output of behaviorTags()
+     * @param int    $pages       Total pages viewed
+     * @param int    $sessions    Number of sessions
+     * @param string $ip          IP address (for unique suffix)
+     * @param string $countryCode 2-letter country code
+     * @return string Human-readable label, e.g. "Cart Abandoner PL1"
      */
-    public static function primaryLabel(array $tags, int $pages = 0, int $sessions = 0, string $ip = ''): string
+    public static function primaryLabel(array $tags, int $pages = 0, int $sessions = 0, string $ip = '', string $countryCode = ''): string
     {
         // Priority map — business funnel order, first match wins
         $priority = [
@@ -227,7 +231,7 @@ class VisitorNickname
             'first-visit'      => 'New Visitor',
         ];
 
-        $suffix = $ip ? ' #' . self::shortId($ip) : '';
+        $suffix = $ip ? ' ' . self::shortId($ip, $countryCode) : '';
 
         foreach ($priority as $tag => $label) {
             if (in_array($tag, $tags)) {