diff --git a/src/urlUtils.ts b/src/urlUtils.ts
index b5840f15..5f694158 100644
--- a/src/urlUtils.ts
+++ b/src/urlUtils.ts
@@ -1,4 +1,5 @@
 import { Region, VisitorHistoryFilter } from './types';
+import { version } from '../package.json';
 
 const euRegionUrl = 'https://eu.api.fpjs.io/';
 const apRegionUrl = 'https://ap.api.fpjs.io/';
@@ -6,6 +7,7 @@ const globalRegionUrl = 'https://api.fpjs.io/';
 
 type QueryStringParameters = VisitorHistoryFilter & {
   api_key?: string;
+  ii: string;
 };
 
 export function getVisitorsUrl(
@@ -14,15 +16,16 @@ export function getVisitorsUrl(
   filter?: VisitorHistoryFilter,
   apiKey?: string
 ): string {
-  const queryStringParameters: QueryStringParameters = filter ?? {};
+  const queryStringParameters: QueryStringParameters = {
+    ...filter,
+    ii: `fingerprint-pro-server-node-sdk/${version}`,
+  };
   if (apiKey) {
     queryStringParameters.api_key = apiKey;
   }
 
   const serverApiPath = getVisitorsPath(region, visitorId);
-  const queryString = queryStringParameters
-    ? serializeQueryStringParams(queryStringParameters)
-    : '';
+  const queryString = serializeQueryStringParams(queryStringParameters);
 
   if (queryString === '') {
     return serverApiPath;