diff --git a/at.cfg.dist b/at.cfg.dist
index 5dd9c9f..c37efdf 100644
--- a/at.cfg.dist
+++ b/at.cfg.dist
@@ -11,4 +11,9 @@ CLAIMABLE_EXCLUDE = [
 #    '127.0.0.1',
 ]
 
+SPECIAL_DEVICES = {
+    'kektops': ('90:e6:ba:84'),
+    'esps': ('ec:fa:bc', 'dc:4f:22', 'd8:a0:1d', 'b4:e6:2d', 'ac:d0:74', 'a4:7b:9d', 'a0:20:a6', '90:97:d5', '68:c6:3a', '60:01:94', '5c:cf:7f', '54:5a:a6', '30:ae:a4', '2c:3a:e8', '24:b2:de', '24:0a:c4', '18:fe:34'),
+}
+
 SECRET_KEY = 'adaba'
diff --git a/at.py b/at.py
index 5f545b8..01347bb 100644
--- a/at.py
+++ b/at.py
@@ -254,30 +254,28 @@ def list_all():
 
 
 def now_at():
+    result = dict()
     devices = app.updater.get_active_devices()
     device_infos = list(get_device_infos(g.db, devices.keys()))
     device_infos.sort(key=lambda di: devices.__getitem__)
     all_unknown = set(devices.keys()) - set(d.hwaddr for d in device_infos)
     # das kektop sorting maschine
-    kektops = set()
-    unknown = set()
-    esps = set()
-    for u in all_unknown:
-        if u.startswith('90:e6:ba:84'):
-            kektops.add(u)
-        elif u.startswith('5c:cf:7f'):
-            esps.add(u)
-        else:
-            unknown.add(u)
+    unknown = all_unknown
+    for name, prefixes in app.config['SPECIAL_DEVICES'].items():
+        result[name] = set()
+        for u in all_unknown:
+            if u.startswith(prefixes):
+                result[name].add(u)
+                unknown.discard(u)
+    result['unknown'] = unknown
 
     users = {}
     for info in device_infos:
         if info.owner not in users:
             users[info.owner] = devices[info.hwaddr][0]
-    users_sorted = sorted(users.items(), key=lambda (u, a): a, reverse=True)
+    result['users'] = sorted(users.items(), key=lambda (u, a): a, reverse=True)
 
-    return dict(users=users_sorted, unknown=unknown, kektops=kektops,
-                esps=esps)
+    return result
 
 
 restrict_to_hs = restrict_ip(prefix=app.config['CLAIMABLE_PREFIX'],