diff --git a/backend/package-lock.json b/backend/package-lock.json
index 8ee57c4..721cb79 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -15,8 +15,8 @@
         "dotenv": "^16.4.7",
         "express": "^4.21.2",
         "express-rate-limit": "^7.5.0",
+        "mac-oui-lookup": "^1.1.4",
         "macaddress": "^0.5.3",
-        "oui": "^13.1.1",
         "pino": "^9.6.0",
         "pino-pretty": "^13.0.0",
         "qs": "^6.14.1",
@@ -1567,6 +1567,12 @@
         "lower-case": "^1.1.2"
       }
     },
+    "node_modules/mac-oui-lookup": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/mac-oui-lookup/-/mac-oui-lookup-1.1.4.tgz",
+      "integrity": "sha512-VuzR8PnMef92j86Mspx8gRwEtW3DjIR2xu2G5x3ezszdopEjVhrrI0r9SpkfPqJMQbsbWRnJrFxTKMXiUaJHHQ==",
+      "license": "MIT"
+    },
     "node_modules/macaddress": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/macaddress/-/macaddress-0.5.3.tgz",
@@ -1736,24 +1742,6 @@
         "wrappy": "1"
       }
     },
-    "node_modules/oui": {
-      "version": "13.1.1",
-      "resolved": "https://registry.npmjs.org/oui/-/oui-13.1.1.tgz",
-      "integrity": "sha512-kv8YMm3UT8Rn5g2N7laIZfgcuWFhuLdyO3D9y3tTe1uBPNaNJMdLSkeb0l8C9jl7H4vgJ3GFfUv9gjVP9CQDmg==",
-      "license": "BSD-2-Clause",
-      "dependencies": {
-        "oui-data": "^1.1.428"
-      },
-      "bin": {
-        "oui": "dist/index.js"
-      }
-    },
-    "node_modules/oui-data": {
-      "version": "1.1.476",
-      "resolved": "https://registry.npmjs.org/oui-data/-/oui-data-1.1.476.tgz",
-      "integrity": "sha512-TTcraRcKV4TTLex4261J2w0AMjq8X5Mj0u4FfIBqLXPSCz+sh37Zdk5g383i7fidoMW+SSfQ1POunNrYenYzKQ==",
-      "license": "BSD-2-Clause"
-    },
     "node_modules/p-limit": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
diff --git a/backend/package.json b/backend/package.json
index 5cb1706..ed02bc9 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -16,11 +16,11 @@
     "dotenv": "^16.4.7",
     "express": "^4.21.2",
     "express-rate-limit": "^7.5.0",
+    "mac-oui-lookup": "^1.1.4",
     "macaddress": "^0.5.3",
-    "oui": "^13.1.1",
     "pino": "^9.6.0",
     "pino-pretty": "^13.0.0",
     "qs": "^6.14.1",
     "whois-json": "^2.0.4"
   }
-}
\ No newline at end of file
+}
diff --git a/backend/routes/macLookup.js b/backend/routes/macLookup.js
index 5e3ae10..02c60b1 100644
--- a/backend/routes/macLookup.js
+++ b/backend/routes/macLookup.js
@@ -1,6 +1,7 @@
 const express = require('express');
 const Sentry = require("@sentry/node");
 const pino = require('pino');
+const { getVendor } = require('mac-oui-lookup');
 const { isValidMacAddress } = require('../utils');
 
 const logger = pino({ level: process.env.LOG_LEVEL || 'info' });
@@ -19,17 +20,7 @@ router.get('/', async (req, res) => {
     }
 
     try {
-        // Dynamic import for ESM-only 'oui' module. Pointing to dist/index.js explicitly.
-        const ouiModule = await import('oui/dist/index.js');
-        const oui = ouiModule.default;
-
-        const ouiData = oui(mac);
-        // oui returns a string (Vendor Name) or null if not found
-
-        let vendor = null;
-        if (ouiData) {
-            vendor = typeof ouiData === 'string' ? ouiData : ouiData.split('\n')[0];
-        }
+        const vendor = getVendor(mac);
 
         if (vendor) {
             logger.info({ requestIp, mac, vendor }, 'MAC lookup successful');