diff --git a/frontend/app/dns-lookup.html b/frontend/app/dns-lookup.html
index f16a989..65b3e7d 100644
--- a/frontend/app/dns-lookup.html
+++ b/frontend/app/dns-lookup.html
@@ -53,7 +53,6 @@
                 <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/subnet-calculator.html b/frontend/app/subnet-calculator.html
index 1b2ce5a..b6fd116 100644
--- a/frontend/app/subnet-calculator.html
+++ b/frontend/app/subnet-calculator.html
@@ -120,7 +120,6 @@
                 <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="mac-lookup.html">MAC Lookup</a></li> <!-- Neu -->
             </ul>
         </nav>
     </header>
diff --git a/frontend/app/whois-lookup.html b/frontend/app/whois-lookup.html
index 11a1d82..a05cfd0 100644
--- a/frontend/app/whois-lookup.html
+++ b/frontend/app/whois-lookup.html
@@ -53,7 +53,6 @@
                 <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>