diff --git a/web/system.py b/web/system.py
index a5e130c..8d2d699 100644
--- a/web/system.py
+++ b/web/system.py
@@ -42,15 +42,6 @@ def run(fun, args=()):
             fun(*args)
     multiprocessing.Process(target=task).start()
 
-# For a network named 'xyzzy-foo', return xyzzy. Used for creating
-# ipsets for office-* and server-* networks.
-def network_group(name):
-    match name.split('-'):
-        case group, _:
-            return group
-        case _:
-            return None
-
 def ipset_add(ipsets, name, ip=None, ip6=None):
     ipsets[name].update(ip or ())
     ipsets[f'{name}/6'].update(ip6 or ())
@@ -95,11 +86,10 @@ def save_config():
 
             # Populate IP sets.
             ipsets = collections.defaultdict(set)
+            # Sets corresponding to VLANs in NetBox. Prefixes for these sets are configured on firewall nodes with ansible.
             for name, network in db.read('networks').items():
-                if group := network_group(name):
-                    ipset_add(ipsets, group, network.get('ip'), network.get('ip6'))
-                ipset_add(ipsets, name, network.get('ip'), network.get('ip6'))
-
+                ipset_add(ipsets, name)
+            # Sets defined by user in friwall app.
             for name, network in db.read('ipsets').items():
                 ipset_add(ipsets, name, network.get('ip'), network.get('ip6'))
 
@@ -110,8 +100,6 @@ def save_config():
                 ip4 = [f'{ip}/32']
                 ip6 = [f'{key["ip6"]}'] if key.get('ip6') else None
                 for network in user_networks.get(key.get('user', ''), ()):
-                    if group := network_group(network):
-                        ipset_add(ipsets, group, ip4, ip6)
                     ipset_add(ipsets, network, ip4, ip6)
 
             # Create config files.