diff --git a/Build/build-telegram-cidr.ts b/Build/build-telegram-cidr.ts
index db0bd685..4a36b64f 100644
--- a/Build/build-telegram-cidr.ts
+++ b/Build/build-telegram-cidr.ts
@@ -8,6 +8,7 @@ import { $$fetch } from './lib/fetch-retry';
 import { fastIpVersion } from 'foxts/fast-ip-version';
 import DNS2 from 'dns2';
 import { getTelegramBackupIPFromBase64 } from './lib/get-telegram-backup-ip';
+import picocolors from 'picocolors';
 
 export const getTelegramCIDRPromise = once(async () => {
   const resp = await $$fetch('https://core.telegram.org/resources/cidr.txt');
@@ -43,33 +44,45 @@ export const getTelegramCIDRPromise = once(async () => {
       dns: '1.0.0.1',
       http: false
     })
-  ].map(async (client) => {
-    try {
-    // tapv3.stel.com was for testing server
-      const resp = await client('apv3.stel.com', 'TXT');
-      const strings = resp.answers.map(i => i.data);
+  ].flatMap(
+    (client) => [
+      'apv3.stel.com', // prod
+      'tapv3.stel.com' // test
+    ].map(async (domain) => {
+      try {
+        // tapv3.stel.com was for testing server
+        const resp = await client(domain, 'TXT');
+        const strings = resp.answers.map(i => i.data);
 
-      const str = strings[0]!.length > strings[1]!.length
-        ? strings[0]! + strings[1]!
-        : strings[1]! + strings[0]!;
+        const str = strings[0]!.length > strings[1]!.length
+          ? strings[0]! + strings[1]!
+          : strings[1]! + strings[0]!;
 
-      const ips = getTelegramBackupIPFromBase64(str);
-      ips.forEach(i => i && backupIPs.add(i.ip));
-    } catch {}
-  }));
+        const ips = getTelegramBackupIPFromBase64(str);
+        ips.forEach(i => backupIPs.add(i.ip));
 
-  // Backup IP Source 2: Firebase Realtime Database
+        console.log('[telegram backup ip]', picocolors.green('DoH TXT'), { domain, ips });
+      } catch (e) {
+        console.error('[telegram backup ip]', picocolors.red('DoH TXT error'), { domain }, e);
+      }
+    })
+  ));
+
+  // Backup IP Source 2: Firebase Realtime Database (test server not supported)
   try {
     const text = await (await $$fetch('https://reserve-5a846.firebaseio.com/ipconfigv3.json')).json();
     if (typeof text === 'string' && text.length === 344) {
       const ips = getTelegramBackupIPFromBase64(text);
-      ips.forEach(i => i && backupIPs.add(i.ip));
+      ips.forEach(i => backupIPs.add(i.ip));
+
+      console.log('[telegram backup ip]', picocolors.green('Firebase Realtime DB'), { ips });
     }
-  } catch {
+  } catch (e) {
+    console.error('[telegram backup ip]', picocolors.red('Firebase Realtime DB error'), e);
     // ignore all errors
   }
 
-  // Backup IP Source 3: Firebase Value Store
+  // Backup IP Source 3: Firebase Value Store (test server not supported)
   try {
     const json = await (await $$fetch('https://firestore.googleapis.com/v1/projects/reserve-5a846/databases/(default)/documents/ipconfig/v3')).json();
     if (
@@ -79,22 +92,37 @@ export const getTelegramCIDRPromise = once(async () => {
       && 'stringValue' in json.fields.data && typeof json.fields.data.stringValue === 'string' && json.fields.data.stringValue.length === 344
     ) {
       const ips = getTelegramBackupIPFromBase64(json.fields.data.stringValue);
-      ips.forEach(i => i && backupIPs.add(i.ip));
-    }
-  } catch {}
+      ips.forEach(i => backupIPs.add(i.ip));
 
-  // Backup IP Source 4: Google App Engine: https://dns-telegram.appspot.com https://dns-telegram.appspot.com/test
-  try {
-    const text = await (await $$fetch('https://dns-telegram.appspot.com')).text();
-    if (text.length === 344) {
-      const ips = getTelegramBackupIPFromBase64(text);
-      ips.forEach(i => i && backupIPs.add(i.ip));
+      console.log('[telegram backup ip]', picocolors.green('Firebase Value Store'), { ips });
+    } else {
+      console.error('[telegram backup ip]', picocolors.red('Firebase Value Store data format invalid'), { json });
     }
-  } catch {}
+  } catch (e) {
+    console.error('[telegram backup ip]', picocolors.red('Firebase Value Store error'), e);
+  }
+
+  // Backup IP Source 4: Google App Engine
+  await Promise.all([
+    'https://dns-telegram.appspot.com',
+    'https://dns-telegram.appspot.com/test'
+  ].map(async (url) => {
+    try {
+      const text = await (await $$fetch(url)).text();
+      if (text.length === 344) {
+        const ips = getTelegramBackupIPFromBase64(text);
+        ips.forEach(i => backupIPs.add(i.ip));
+
+        console.log('[telegram backup ip]', picocolors.green('Google App Engine'), { url, ips });
+      }
+    } catch (e) {
+      console.error('[telegram backup ip]', picocolors.red('Google App Engine error'), { url }, e);
+    }
+  }));
 
   // tcdnb.azureedge.net no longer works
 
-  console.log(`Found ${backupIPs.size} backup IPs:`, backupIPs);
+  console.log('[telegram backup ip]', `Found ${backupIPs.size} backup IPs:`, backupIPs);
 
   ipcidr.push(...Array.from(backupIPs).map(i => i + '/32'));