diff --git a/main.go b/main.go
index de0c572..8356409 100644
--- a/main.go
+++ b/main.go
@@ -19,57 +19,8 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/redis/go-redis/v9"
-	"github.com/yl2chen/cidranger"
 )
 
-// ──────────────────────────────────────────────
-// Ranger-Cache (statt prefixCache)
-// ──────────────────────────────────────────────
-type rangerCacheEntry struct {
-	ranger   cidranger.Ranger
-	expireAt time.Time
-}
-
-var (
-	rangerCache   = map[string]rangerCacheEntry{}
-	rangerCacheMu sync.RWMutex
-)
-
-// buildCategoryRanger holt alle CIDRs aus Redis, baut einen PCTrie
-// und legt ihn 10 Minuten im Cache ab.
-func buildCategoryRanger(cat string) (cidranger.Ranger, error) {
-	// --------- 1) Leser-Lock: schneller Cache-Hit
-	rangerCacheMu.RLock()
-	if e, ok := rangerCache[cat]; ok && time.Now().Before(e.expireAt) {
-		rangerCacheMu.RUnlock()
-		return e.ranger, nil
-	}
-	rangerCacheMu.RUnlock()
-
-	// --------- 2) Daten aus Redis ziehen
-	keys, err := rdb.HKeys(ctx, "bl:"+cat).Result()
-	log.Printf("Building ranger for %s - keys: %d", cat, len(keys))
-	if err != nil {
-		return nil, err
-	}
-	r := cidranger.NewPCTrieRanger()
-	for _, k := range keys {
-		if _, ipNet, err := net.ParseCIDR(strings.TrimSpace(k)); err == nil {
-			_ = r.Insert(cidranger.NewBasicRangerEntry(*ipNet))
-		}
-	}
-
-	// --------- 3) Schreiber-Lock: Cache aktualisieren
-	rangerCacheMu.Lock()
-	rangerCache[cat] = rangerCacheEntry{
-		ranger:   r,
-		expireAt: time.Now().Add(10 * time.Minute),
-	}
-	rangerCacheMu.Unlock()
-
-	return r, nil
-}
-
 // Redis + Context
 var ctx = context.Background()
 var rdb = redis.NewClient(&redis.Options{
@@ -110,6 +61,17 @@ var blocklistURLs = map[string]string{
 	"bitwire": "https://raw.githubusercontent.com/bitwire-it/ipblocklist/refs/heads/main/ip-list.txt",
 }
 
+// Präfix-Cache
+type prefixCacheEntry struct {
+	prefixes []netip.Prefix
+	expireAt time.Time
+}
+
+var (
+	prefixCache   = map[string]prefixCacheEntry{}
+	prefixCacheMu sync.RWMutex
+)
+
 // Prometheus Metriken
 var (
 	checkRequests = prometheus.NewCounter(prometheus.CounterOpts{
@@ -145,8 +107,6 @@ func main() {
 		return
 	}
 
-	warmUpRangers()
-
 	// Server
 	http.HandleFunc("/", handleGUI)
 	http.HandleFunc("/download/", handleDownload)
@@ -351,6 +311,10 @@ func handleWhitelist(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "redis error", http.StatusInternalServerError)
 		return
 	}
+
+	// Optional: Cache leeren für die IP
+	prefixCacheMu.Lock()
+	defer prefixCacheMu.Unlock()
 	// Kein spezifischer IP-Cache in deinem Design, aber hier könnte man Cache invalidieren falls nötig
 
 	writeJSON(w, map[string]string{
@@ -370,7 +334,7 @@ func handleCheck(w http.ResponseWriter, r *http.Request) {
 	}
 
 	var cats []string
-	for a := range blocklistURLs {
+	for a, _ := range blocklistURLs {
 		cats = append(cats, a)
 	}
 
@@ -402,12 +366,6 @@ func handleTraefik(w http.ResponseWriter, r *http.Request) {
 	if ipStr == "" {
 		ipStr = r.RemoteAddr
 	}
-	ipStr = strings.TrimSpace(strings.Split(ipStr, ",")[0]) // evtl. mehrere IPs
-
-	// Port abschneiden – funktioniert für IPv4 und IPv6:
-	if host, _, err := net.SplitHostPort(ipStr); err == nil {
-		ipStr = host
-	}
 	ip, err := netip.ParseAddr(ipStr)
 	if err != nil {
 		http.Error(w, "invalid IP", http.StatusBadRequest)
@@ -415,7 +373,7 @@ func handleTraefik(w http.ResponseWriter, r *http.Request) {
 	}
 
 	var cats []string
-	for a := range blocklistURLs {
+	for a, _ := range blocklistURLs {
 		cats = append(cats, a)
 	}
 
@@ -442,34 +400,57 @@ func handleTraefik(w http.ResponseWriter, r *http.Request) {
 
 // Check-Logik
 func checkIP(ip netip.Addr, cats []string) ([]string, error) {
-	// Whitelist zuerst prüfen
-	if wl, err := rdb.Exists(ctx, "wl:"+ip.String()).Result(); err == nil && wl > 0 {
-		return nil, nil
+	wl, err := rdb.Exists(ctx, "wl:"+ip.String()).Result()
+	if err != nil {
+		return nil, err
 	}
-
-	var matches []string
-	needle := net.IP(ip.AsSlice())
-
+	if wl > 0 {
+		return []string{}, nil
+	}
+	matches := []string{}
 	for _, cat := range cats {
-		r, err := buildCategoryRanger(cat)
+		prefixes, err := loadCategoryPrefixes(cat)
 		if err != nil {
 			return nil, err
 		}
-		ok, _ := r.Contains(needle)
-		if ok {
-			fmt.Printf("💡 MATCH: %s in %s\n", ip, cat)
-			matches = append(matches, cat)
+		for _, pfx := range prefixes {
+			if pfx.Contains(ip) {
+				fmt.Printf("💡 MATCH: %s in %s (%s)\n", ip, cat, pfx)
+				matches = append(matches, cat)
+				break
+			}
 		}
 	}
 	return matches, nil
 }
 
-func warmUpRangers() {
-	for cat := range blocklistURLs {
-		if _, err := buildCategoryRanger(cat); err != nil {
-			log.Printf("warm-up error for %s: %v", cat, err)
+func loadCategoryPrefixes(cat string) ([]netip.Prefix, error) {
+	prefixCacheMu.Lock()
+	defer prefixCacheMu.Unlock()
+	entry, ok := prefixCache[cat]
+	if ok && time.Now().Before(entry.expireAt) {
+		return entry.prefixes, nil
+	}
+	keys, err := rdb.HKeys(ctx, "bl:"+cat).Result()
+	if err != nil {
+		return nil, err
+	}
+	var prefixes []netip.Prefix
+	for _, k := range keys {
+		k = strings.TrimSpace(k)
+		pfx, err := netip.ParsePrefix(k)
+		if err == nil {
+			prefixes = append(prefixes, pfx)
+		} else {
+			fmt.Printf("⚠️ Ungültiger Redis-Prefix %s: %s\n", cat, k)
 		}
 	}
+	prefixCache[cat] = prefixCacheEntry{
+		prefixes: prefixes,
+		expireAt: time.Now().Add(10 * time.Minute),
+		//Hier geändert von 1 * time.Second
+	}
+	return prefixes, nil
 }
 
 // JSON-Helfer