diff --git a/src/health-check/health-check.service.ts b/src/health-check/health-check.service.ts
index fec1a01..8ee3020 100644
--- a/src/health-check/health-check.service.ts
+++ b/src/health-check/health-check.service.ts
@@ -1,72 +1,104 @@
-import { Injectable, Logger } from '@nestjs/common';
+import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
 import { Cron, CronExpression } from '@nestjs/schedule';
 import { PrismaService } from '../prisma/prisma.service';
+import * as http from 'http';
+import * as https from 'https';
 
 @Injectable()
-export class HealthCheckService {
+export class HealthCheckService implements OnModuleInit {
   private readonly logger = new Logger(HealthCheckService.name);
 
   constructor(private readonly prisma: PrismaService) {}
 
+  // Один прогон вскоре после старта, чтобы isOnline был актуален после деплоя
+  async onModuleInit() {
+    setTimeout(() => {
+      void this.checkAllStations();
+    }, 15000);
+  }
+
   @Cron(CronExpression.EVERY_HOUR)
   async checkAllStations() {
-    this.logger.log('Starting hourly station health check...');
-    const stations = await this.prisma.station.findMany();
-    let onlineCount = 0;
-    let offlineCount = 0;
+    this.logger.log('Проверка доступности станций...');
+    const stations = await this.prisma.station.findMany({
+      select: { id: true, streamUrl: true, isOnline: true },
+    });
 
-    for (const station of stations) {
-      try {
-        const isOnline = await this.checkStation(station.streamUrl);
-        await this.prisma.station.update({
-          where: { id: station.id },
-          data: { isOnline, lastCheckAt: new Date() },
-        });
-        if (isOnline) onlineCount++;
-        else offlineCount++;
-      } catch (error) {
-        this.logger.warn(
-          `Failed to check station ${station.name}: ${error.message}`,
-        );
-        await this.prisma.station.update({
-          where: { id: station.id },
-          data: { isOnline: false, lastCheckAt: new Date() },
-        });
-        offlineCount++;
-      }
+    let online = 0;
+    let offline = 0;
+    const CONC = 24;
+
+    for (let i = 0; i < stations.length; i += CONC) {
+      const batch = stations.slice(i, i + CONC);
+      await Promise.all(
+        batch.map(async (s) => {
+          const isOnline = await this.isAlive(s.streamUrl);
+          if (isOnline) online++;
+          else offline++;
+          // Пишем только при изменении статуса — меньше нагрузка на БД
+          if (isOnline !== s.isOnline) {
+            await this.prisma.station
+              .update({
+                where: { id: s.id },
+                data: { isOnline, lastCheckAt: new Date() },
+              })
+              .catch(() => undefined);
+          }
+        }),
+      );
     }
 
-    this.logger.log(
-      `Health check complete. Online: ${onlineCount}, Offline: ${offlineCount}`,
-    );
+    this.logger.log(`Проверка завершена. Online: ${online}, Offline: ${offline}`);
   }
 
-  private async checkStation(url: string): Promise<boolean> {
-    const controller = new AbortController();
-    const timeout = setTimeout(() => controller.abort(), 10000);
-
-    try {
-      const response = await fetch(url, {
-        method: 'HEAD',
-        signal: controller.signal,
-      });
-      clearTimeout(timeout);
-      return response.status >= 200 && response.status < 400;
-    } catch {
-      clearTimeout(timeout);
-      // Fallback to GET if HEAD fails
-      try {
-        const controller2 = new AbortController();
-        const timeout2 = setTimeout(() => controller2.abort(), 10000);
-        const response = await fetch(url, {
-          method: 'GET',
-          signal: controller2.signal,
-        });
-        clearTimeout(timeout2);
-        return response.status >= 200 && response.status < 400;
-      } catch {
-        return false;
-      }
+  /**
+   * Живость потока: живой = пришли заголовки со статусом 200–399.
+   * Аудиопоток отдаёт тело бесконечно, поэтому сразу после заголовков рвём
+   * соединение (req.destroy). Ошибка/4xx/5xx/таймаут = мёртв. 2 попытки.
+   */
+  private async isAlive(url: string): Promise<boolean> {
+    for (let attempt = 0; attempt < 2; attempt++) {
+      if (await this.probe(url)) return true;
+      await this.sleep(300);
     }
+    return false;
+  }
+
+  private probe(url: string): Promise<boolean> {
+    return new Promise((resolve) => {
+      let done = false;
+      const finish = (v: boolean) => {
+        if (!done) {
+          done = true;
+          resolve(v);
+        }
+      };
+      try {
+        const lib = url.startsWith('https') ? https : http;
+        const req = lib.get(
+          url,
+          {
+            timeout: 8000,
+            headers: { 'User-Agent': 'Mozilla/5.0', 'Icy-MetaData': '1' },
+          },
+          (res) => {
+            const code = res.statusCode ?? 0;
+            req.destroy();
+            finish(code >= 200 && code < 400);
+          },
+        );
+        req.on('error', () => finish(false));
+        req.on('timeout', () => {
+          req.destroy();
+          finish(false);
+        });
+      } catch {
+        finish(false);
+      }
+    });
+  }
+
+  private sleep(ms: number): Promise<void> {
+    return new Promise((r) => setTimeout(r, ms));
   }
 }
diff --git a/src/stations/stations.controller.ts b/src/stations/stations.controller.ts
index a9e8f54..d635060 100644
--- a/src/stations/stations.controller.ts
+++ b/src/stations/stations.controller.ts
@@ -36,6 +36,12 @@ export class StationsController {
     });
   }
 
+  @Get('offline-ids')
+  @ApiOperation({ summary: 'station_id оффлайн-станций (для скрытия в клиенте)' })
+  async offlineIds() {
+    return this.stationsService.getOfflineStationIds();
+  }
+
   @Get(':id')
   @ApiOperation({ summary: 'Get station by ID' })
   async findOne(@Param('id') id: string) {
diff --git a/src/stations/stations.service.ts b/src/stations/stations.service.ts
index c47b884..0f87160 100644
--- a/src/stations/stations.service.ts
+++ b/src/stations/stations.service.ts
@@ -35,6 +35,15 @@ export class StationsService {
     });
   }
 
+  // station_id оффлайн-станций — для скрытия мёртвых плиток в клиенте
+  async getOfflineStationIds(): Promise<number[]> {
+    const rows = await this.prisma.station.findMany({
+      where: { isOnline: false },
+      select: { stationId: true },
+    });
+    return rows.map((r) => r.stationId);
+  }
+
   async findOne(id: string) {
     const station = await this.prisma.station.findUnique({
       where: { id },