diff --git a/listener.py b/listener.py
index 8a9e586..76472dc 100755
--- a/listener.py
+++ b/listener.py
@@ -323,7 +323,9 @@ def main():
 
 def get_mac_vendor(mac):
     prefix = mac.upper()[0:8].replace(":", "-")
+    print(f"[DEBUG] Looking up prefix: {prefix}")
     if prefix in vendor_cache:
+        print(f"[DEBUG] Cached hit: {vendor_cache[prefix]}")
         return vendor_cache[prefix]
     try:
         if not os.path.exists("oui.txt"):
@@ -333,12 +335,15 @@ def get_mac_vendor(mac):
             urllib.request.urlretrieve(url, "oui.txt")
         with open("oui.txt", "r", encoding="utf-8", errors="ignore") as f:
             for line in f:
-                if "(hex)" in line and prefix in line:
-                    parts = line.strip().split()
-                    if len(parts) >= 3 and parts[0] == prefix and parts[1] == "(hex)":
-                        vendor = " ".join(parts[2:]).strip()
-                        vendor_cache[prefix] = vendor
-                        return vendor
+                if line.strip().endswith("(hex)"):
+                    parts = line.split()
+                    if len(parts) >= 3:
+                        print(f"[DEBUG] Checking line: {parts}")
+                        if parts[0] == prefix:
+                            vendor = " ".join(parts[2:]).replace("(hex)", "").strip()
+                            vendor_cache[prefix] = vendor
+                            print(f"[DEBUG] Vendor found: {vendor}")
+                            return vendor
     except Exception as e:
         print(f"[ERROR] Vendor lookup failed: {e}")
     vendor_cache[prefix] = "Unknown"