diff --git a/app/Http/Controllers/GuestbookController.php b/app/Http/Controllers/GuestbookController.php
index aff30ed..da5391d 100644
--- a/app/Http/Controllers/GuestbookController.php
+++ b/app/Http/Controllers/GuestbookController.php
@@ -16,6 +16,12 @@ public function guestbookPost(Request $request) {
             'message' => 'required'
         ]);
 
+        $matching_bans = DB::select('SELECT reason FROM guestbook_bans WHERE ip_address = ?', array($request->ip()));
+
+        if (count($matching_bans) > 0 ) {
+            return view('errors.guestbook-ban')->with('reason', $matching_bans[0]->reason);
+        }
+
         DB::insert('INSERT INTO guestbook_entries (name, timestamp, ip_address, agent, message) values (?, ?, ?, ?, ?)', array(
             htmlspecialchars($request->get('name')),
             time(),
diff --git a/resources/views/errors/guestbook-ban.blade.php b/resources/views/errors/guestbook-ban.blade.php
new file mode 100644
index 0000000..257dd72
--- /dev/null
+++ b/resources/views/errors/guestbook-ban.blade.php
@@ -0,0 +1,12 @@
+@extends('layouts.minimal')
+@section('title', 'Error 403: IP Blocked!')
+@section('content')
+    <h1>Error 403: IP Blocked!</h1>
+    <hr/>
+    <p>Your IP has been banned from submitting to the guestbook.</p>
+    @if (isset($reason))
+        <p><b>Reason:</b> {{ $reason }}</p>
+    @endif
+    <br/>
+    Click <a href="/guestbook">here</a> to go back to the guestbook.
+@stop