diff --git a/frontend/app/dns-lookup.html b/frontend/app/dns-lookup.html
index 65b3e7d..f16a989 100644
--- a/frontend/app/dns-lookup.html
+++ b/frontend/app/dns-lookup.html
@@ -53,6 +53,7 @@
                 <li><a href="subnet-calculator.html">Subnetz Rechner</a></li>
                 <li><a href="dns-lookup.html">DNS Lookup</a></li>
                 <li><a href="whois-lookup.html">WHOIS Lookup</a></li>
+                <li><a href="mac-lookup.html">MAC Lookup</a></li>
             </ul>
         </nav>
     </header>
diff --git a/frontend/app/mac-lookup.html b/frontend/app/mac-lookup.html
index 9f1cbc2..41acede 100644
--- a/frontend/app/mac-lookup.html
+++ b/frontend/app/mac-lookup.html
@@ -1,4 +1,3 @@
-// frontend/app/mac-lookup.html
 <!DOCTYPE html>
 <html lang="de">
 <head>
diff --git a/frontend/app/subnet-calculator.html b/frontend/app/subnet-calculator.html
index b6fd116..c67b473 100644
--- a/frontend/app/subnet-calculator.html
+++ b/frontend/app/subnet-calculator.html
@@ -116,10 +116,11 @@
         <h1>uTools Network Suite</h1> <!-- Titel angepasst -->
         <nav>
             <ul>
-                <li><a href="index.html">IP Info & Tools</a></li> <!-- Angepasst -->
+                <li><a href="index.html">IP Info & Tools</a></li>
                 <li><a href="subnet-calculator.html">Subnetz Rechner</a></li>
-                <li><a href="dns-lookup.html">DNS Lookup</a></li> <!-- Neu -->
-                <li><a href="whois-lookup.html">WHOIS Lookup</a></li> <!-- Neu -->
+                <li><a href="dns-lookup.html">DNS Lookup</a></li>
+                <li><a href="whois-lookup.html">WHOIS Lookup</a></li>
+                <li><a href="mac-lookup.html">MAC Lookup</a></li>
             </ul>
         </nav>
     </header>
diff --git a/frontend/app/whois-lookup.html b/frontend/app/whois-lookup.html
index a05cfd0..11a1d82 100644
--- a/frontend/app/whois-lookup.html
+++ b/frontend/app/whois-lookup.html
@@ -53,6 +53,7 @@
                 <li><a href="subnet-calculator.html">Subnetz Rechner</a></li>
                 <li><a href="dns-lookup.html">DNS Lookup</a></li>
                 <li><a href="whois-lookup.html">WHOIS Lookup</a></li>
+                <li><a href="mac-lookup.html">MAC Lookup</a></li>
             </ul>
         </nav>
     </header>
