diff --git a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/activethread/count/websocket/ActiveThreadCountHandlerImpl.java b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/activethread/count/websocket/ActiveThreadCountHandlerImpl.java
index ff723e9c4e2f..77c6ff2dfe45 100644
--- a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/activethread/count/websocket/ActiveThreadCountHandlerImpl.java
+++ b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/activethread/count/websocket/ActiveThreadCountHandlerImpl.java
@@ -114,8 +114,7 @@ private void refreshWithContext(SessionContext ctx, WebSocketSession session, St
     }
 
     private Consumer<Long> makeTickHandler(SessionContext ctx, WebSocketSession session, String applicationName) {
-        final List<ClusterKey> agentKeys =
-                this.agentLookupService.getRecentAgents(applicationName, TimeUnit.HOURS.toMillis(1));
+        final List<ClusterKey> agentKeys = this.agentLookupService.getRecentAgents(applicationName);
         final TickHandler handler = new TickHandler(session, applicationName, agentKeys, getFetchers(agentKeys));
         final Runnable decoratedHandler = decorateHandler(ctx.getTaskDecorator(), handler);
         return t -> decoratedHandler.run();
diff --git a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupService.java b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupService.java
index 509a96d84a5f..3ce2dcff4cce 100644
--- a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupService.java
+++ b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupService.java
@@ -24,6 +24,6 @@
  */
 public interface AgentLookupService {
 
-    List<ClusterKey> getRecentAgents(String applicationName, long timeDiffMs);
+    List<ClusterKey> getRecentAgents(String applicationName);
 
 }
diff --git a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupServiceImpl.java b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupServiceImpl.java
index 32de03c731ca..a5e4e4349d37 100644
--- a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupServiceImpl.java
+++ b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/AgentLookupServiceImpl.java
@@ -16,15 +16,17 @@
 package com.navercorp.pinpoint.web.realtime.service;
 
 import com.navercorp.pinpoint.common.server.cluster.ClusterKey;
-import com.navercorp.pinpoint.common.server.util.AgentLifeCycleState;
-import com.navercorp.pinpoint.web.cluster.ClusterKeyAndStatus;
-import com.navercorp.pinpoint.web.service.AgentService;
-import com.navercorp.pinpoint.web.vo.agent.AgentStatus;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import com.navercorp.pinpoint.common.server.util.time.Range;
+import com.navercorp.pinpoint.web.service.AgentInfoService;
+import com.navercorp.pinpoint.web.vo.agent.AgentInfo;
+import com.navercorp.pinpoint.web.vo.agent.AgentStatusAndLink;
+import com.navercorp.pinpoint.web.vo.agent.AgentStatusFilter;
+import com.navercorp.pinpoint.web.vo.agent.AgentStatusFilterChain;
+import com.navercorp.pinpoint.web.vo.tree.AgentsMapByHost;
+import com.navercorp.pinpoint.web.vo.tree.InstancesList;
+import com.navercorp.pinpoint.web.vo.tree.SortByAgentInfo;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 
@@ -33,37 +35,35 @@
  */
 class AgentLookupServiceImpl implements AgentLookupService {
 
-    private static final Logger logger = LogManager.getLogger(AgentLookupServiceImpl.class);
+    private final AgentInfoService agentInfoService;
 
-    private final AgentService agentService;
-
-    AgentLookupServiceImpl(AgentService agentService) {
-        this.agentService = Objects.requireNonNull(agentService, "agentService");
+    AgentLookupServiceImpl(AgentInfoService agentInfoService) {
+        this.agentInfoService = Objects.requireNonNull(agentInfoService, "agentInfoService");
     }
 
     @Override
-    public List<ClusterKey> getRecentAgents(String applicationName, long timeDiffMs) {
-        final List<ClusterKeyAndStatus> keyAndStatuses = getRecentAgentInfoList0(applicationName, timeDiffMs);
-        final List<ClusterKey> keys = new ArrayList<>(keyAndStatuses.size());
-        for (final ClusterKeyAndStatus keyAndStatus: keyAndStatuses) {
-            if (isActive(keyAndStatus.getStatus())) {
-                keys.add(keyAndStatus.getClusterKey());
-            }
-        }
-        return keys;
+    public List<ClusterKey> getRecentAgents(String applicationName) {
+        final long now = System.currentTimeMillis();
+        return intoClusterKeyList(this.agentInfoService.getAgentsListByApplicationName(
+                new AgentStatusFilterChain(AgentStatusFilter::filterRunning),
+                applicationName,
+                Range.between(now, now),
+                SortByAgentInfo.Rules.AGENT_NAME_ASC
+        ));
     }
 
-    private List<ClusterKeyAndStatus> getRecentAgentInfoList0(String applicationName, long timeDiffMs) {
-        try {
-            return agentService.getRecentAgentInfoList(applicationName, timeDiffMs);
-        } catch (Exception e) {
-            logger.warn("Failed to get recent agent info list for {}", applicationName, e);
+    private static List<ClusterKey> intoClusterKeyList(AgentsMapByHost src) {
+        final List<ClusterKey> result = new ArrayList<>(src.getAgentsListsList().size());
+        for (final InstancesList<AgentStatusAndLink> instancesList: src.getAgentsListsList()) {
+            for (final AgentStatusAndLink instance: instancesList.getInstancesList()) {
+                result.add(intoClusterKey(instance.getAgentInfo()));
+            }
         }
-        return Collections.emptyList();
+        return result;
     }
 
-    private boolean isActive(AgentStatus agentStatus) {
-        return agentStatus != null && agentStatus.getState() != AgentLifeCycleState.UNKNOWN;
+    private static ClusterKey intoClusterKey(AgentInfo src) {
+        return new ClusterKey(src.getApplicationName(), src.getAgentId(), src.getStartTimestamp());
     }
 
 }
diff --git a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/RealtimeWebServiceConfig.java b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/RealtimeWebServiceConfig.java
index c9a7b34dd514..8117f2c2f1bc 100644
--- a/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/RealtimeWebServiceConfig.java
+++ b/realtime/realtime-web/src/main/java/com/navercorp/pinpoint/web/realtime/service/RealtimeWebServiceConfig.java
@@ -15,6 +15,7 @@
  */
 package com.navercorp.pinpoint.web.realtime.service;
 
+import com.navercorp.pinpoint.web.service.AgentInfoService;
 import com.navercorp.pinpoint.web.service.AgentService;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.context.annotation.Bean;
@@ -28,8 +29,8 @@ public class RealtimeWebServiceConfig {
 
     @Bean
     @ConditionalOnBean(AgentService.class)
-    AgentLookupService agentLookupService(AgentService agentService) {
-        return new AgentLookupServiceImpl(agentService);
+    AgentLookupService agentLookupService(AgentInfoService agentInfoService) {
+        return new AgentLookupServiceImpl(agentInfoService);
     }
 
 }