diff --git a/README.md b/README.md
index 474c75b3f..2d664a25d 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,10 @@ Optional: set `API_URL` to change the base URL used by internal UI API calls.
 Relative paths are served under `BASE_PATH`; absolute URLs are proxied through the local `/api` route.
 For example, `API_URL=/internal-api` or `API_URL=https://api.example.com/api`.
 
+IP geolocation uses the IP9 online API first and falls back to the local GeoLite2 database when the
+online request fails. Set `IP_LOCATION_API_URL` to override the endpoint and
+`IP_LOCATION_API_TIMEOUT` to change the request timeout in milliseconds (default: `2000`).
+
 The connection URL format:
 
 ```bash
diff --git a/src/lib/detect.test.ts b/src/lib/detect.test.ts
index 804c84029..cad375004 100644
--- a/src/lib/detect.test.ts
+++ b/src/lib/detect.test.ts
@@ -12,10 +12,14 @@ vi.mock('is-localhost-ip', () => ({
 
 beforeEach(() => {
   vi.resetAllMocks();
+  vi.unstubAllGlobals();
 
   delete process.env.CLIENT_IP_HEADER;
   delete process.env.IGNORE_IP;
+  delete process.env.IP_LOCATION_API_TIMEOUT;
+  delete process.env.IP_LOCATION_API_URL;
   delete process.env.SKIP_LOCATION_HEADERS;
+  delete globalThis.maxmind;
 });
 
 test('getIpAddress: Custom header', () => {
@@ -70,6 +74,40 @@ test('getLocation: treats localhost check errors as non-local', async () => {
   });
 });
 
+test('getLocation: uses online location lookup before the local database', async () => {
+  isLocalhost.default.mockResolvedValue(false);
+  const fetch = vi.fn().mockResolvedValue(
+    new Response(
+      JSON.stringify({
+        ret: 200,
+        data: {
+          country_code: 'cn',
+          prov: '北京市',
+          city: '北京',
+        },
+      }),
+      { status: 200 },
+    ),
+  );
+  vi.stubGlobal('fetch', fetch);
+
+  await expect(getLocation('58.30.0.0', new Headers(), true)).resolves.toEqual({
+    country: 'CN',
+    region: 'CN-BJ',
+    city: '北京',
+  });
+  expect(fetch).toHaveBeenCalledOnce();
+});
+
+test('getLocation: falls back to the local database when online lookup fails', async () => {
+  isLocalhost.default.mockResolvedValue(false);
+  vi.stubGlobal('fetch', vi.fn().mockRejectedValue(new Error('Network error')));
+
+  await expect(getLocation('8.8.8.8', new Headers(), true)).resolves.toMatchObject({
+    country: 'US',
+  });
+});
+
 test('hasBlockedIp: returns false for malformed client ip with cidr block', () => {
   process.env.IGNORE_IP = '10.0.0.0/8';
 
diff --git a/src/lib/detect.ts b/src/lib/detect.ts
index fb36ba212..ad9e22ff4 100644
--- a/src/lib/detect.ts
+++ b/src/lib/detect.ts
@@ -8,6 +8,45 @@ import { getIpAddress, stripPort } from '@/lib/ip';
 import { safeDecodeURIComponent } from '@/lib/url';
 
 const MAXMIND = 'maxmind';
+const IP_LOCATION_API_URL = 'https://ip9.com.cn/get';
+const IP_LOCATION_API_TIMEOUT = 2000;
+
+const CHINA_REGION_CODES = {
+  北京: 'BJ',
+  天津: 'TJ',
+  河北: 'HE',
+  山西: 'SX',
+  内蒙古: 'NM',
+  辽宁: 'LN',
+  吉林: 'JL',
+  黑龙江: 'HL',
+  上海: 'SH',
+  江苏: 'JS',
+  浙江: 'ZJ',
+  安徽: 'AH',
+  福建: 'FJ',
+  江西: 'JX',
+  山东: 'SD',
+  河南: 'HA',
+  湖北: 'HB',
+  湖南: 'HN',
+  广东: 'GD',
+  广西: 'GX',
+  海南: 'HI',
+  重庆: 'CQ',
+  四川: 'SC',
+  贵州: 'GZ',
+  云南: 'YN',
+  西藏: 'XZ',
+  陕西: 'SN',
+  甘肃: 'GS',
+  青海: 'QH',
+  宁夏: 'NX',
+  新疆: 'XJ',
+  台湾: 'TW',
+  香港: 'HK',
+  澳门: 'MO',
+};
 
 const PROVIDER_HEADERS = [
   // Umami custom headers (cloud mode only)
@@ -84,6 +123,46 @@ async function isLocalIp(ip: string) {
   }
 }
 
+function getChinaRegionCode(province: string) {
+  const name = province?.trim();
+  const region = Object.entries(CHINA_REGION_CODES).find(([key]) => name?.startsWith(key))?.[1];
+
+  return region ? getRegionCode('CN', region) : undefined;
+}
+
+async function getOnlineLocation(ip: string) {
+  try {
+    const url = new URL(process.env.IP_LOCATION_API_URL || IP_LOCATION_API_URL);
+    const timeout = Number(process.env.IP_LOCATION_API_TIMEOUT) || IP_LOCATION_API_TIMEOUT;
+
+    url.searchParams.set('ip', ip);
+
+    const response = await fetch(url, {
+      headers: { Accept: 'application/json' },
+      signal: AbortSignal.timeout(timeout),
+    });
+
+    if (!response.ok) {
+      return null;
+    }
+
+    const result = await response.json();
+    const country = result?.data?.country_code?.trim()?.toUpperCase();
+
+    if (result?.ret !== 200 || !/^[A-Z]{2}$/.test(country)) {
+      return null;
+    }
+
+    return {
+      country,
+      region: country === 'CN' ? getChinaRegionCode(result.data.prov) : undefined,
+      city: result.data.city?.trim() || undefined,
+    };
+  } catch {
+    return null;
+  }
+}
+
 export async function getLocation(ip: string = '', headers: Headers, skipHeaders: boolean) {
   const cleanIp = stripPort(ip);
 
@@ -109,6 +188,12 @@ export async function getLocation(ip: string = '', headers: Headers, skipHeaders
     }
   }
 
+  const onlineLocation = await getOnlineLocation(cleanIp);
+
+  if (onlineLocation) {
+    return onlineLocation;
+  }
+
   // Database lookup
   if (!globalThis[MAXMIND]) {
     const dir = path.join(process.cwd(), 'geo');