app/Http/Controllers/Auth/LoginController.php

@@ -25,6 +25,7 @@ use App\Http\Controllers\Controller;
 use App\User;
 use Illuminate\Foundation\Auth\AuthenticatesUsers;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Log;
 
 class LoginController extends Controller
 {
@@ -77,4 +78,17 @@ class LoginController extends Controller
 
         return $this->originalAttemptLogin($request);
     }
+
+    public function authenticated(Request $request, User $user)
+    {
+        if ($user->originalIP !== $request->ip())
+        {
+            Log::alert('User IP address changed from last login. Updating.', [
+                'prev' => $user->originalIP,
+                'new' => $request->ip()
+            ]);
+            $user->originalIP = $request->ip();
+            $user->save();
+        }
+    }
 }

app/Http/Middleware/IPHistoryMiddleware.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+
+class IPHistoryMiddleware
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return mixed
+     */
+    public function handle(Request $request, Closure $next)
+    {
+        return $next($request);
+    }
+}