diff --git a/icingabot.py b/icingabot.py
index d9ae33d..7b33307 100755
--- a/icingabot.py
+++ b/icingabot.py
@@ -15,6 +15,7 @@ import json
 import os.path
 import re
 import sys
+from itertools import groupby
 
 import requests
 
@@ -107,7 +108,7 @@ class Icinga2ServiceManager:
             "X-HTTP-Method-Override": "GET",
         }
         data = {
-            "attrs": ["last_check_result"],
+            "attrs": ["last_check_result", "display_name", "host_name"],
             "filter": "service.state!=ServiceOK",
         }
         try:
@@ -309,18 +310,35 @@ class IcingaBot(Icinga2ServiceManager, irc.bot.SingleServerIRCBot):
     def do_leave(self, c, e):
         self.disconnect()
 
+    def regrouped_ko_services(self):
+        def regroup_key(elem):
+            return elem["attrs"]["display_name"]
+
+        return [
+            (group, [service["attrs"]["host_name"] for service in services])
+            for group, services in groupby(
+                sorted(self.ko_services, key=regroup_key), regroup_key
+            )
+        ]
+
     def do_list(self, c, e):
-        if self.notifications:
-            for srv in self.notifications:
-                try:
-                    self.send(
-                        "{}: => {}".format(
-                            srv["name"],
-                            srv["attrs"]["last_check_result"]["output"],
+        if self.ko_services:
+            host_by_service = [
+                (service, [hostname.split(".")[0] for hostname in hosts])
+                for service, hosts in sorted(
+                    self.regrouped_ko_services(), key=lambda x: -len(x[1])
+                )
+            ]
+            self.send(
+                "\n".join(
+                    [
+                        "{} ({}): {}".format(
+                            service, len(hostnames), ", ".join(hostnames)
                         )
-                    )
-                except Exception:
-                    self.send("{}: => No check result.".format(srv["name"]))
+                        for service, hostnames in host_by_service
+                    ]
+                )
+            )
         else:
             self.send("Nothing particularly exciting.")