diff --git a/dyndomain b/dyndomain
index f53c8bf..b3d71f9 100755
--- a/dyndomain
+++ b/dyndomain
@@ -28,16 +28,16 @@ def load_conf():
     zone_filename = conf['Files']['zonefile']
     log_filename = conf['Files']['logfile']
 
-    wan_hostname = conf['Wan']['hostname']
-    zone_domain = conf['Zone']['domain']
-    zone_subdomain = conf['Zone']['subdomain']
+    wan_hostname = conf['Wan']['hostname'].lower()
+    zone_domain = conf['Zone']['domain'].lower()
+    zone_subdomain = conf['Zone']['subdomain'].lower()
     mail_from = conf['Mail']['from']
     mail_to   = conf['Mail']['to']
     mail_ignore_list = [ host for host in conf['MailIgnore'] ]
 
-    hosts_list = [ host for host in conf['Hosts'] ]
-    hosts_ipv4_nat_list = [ host for host in conf['NatHosts'] ]
-    hosts_alias_list = conf['Aliases']
+    hosts_list = [ host.lower() for host in conf['Hosts'] ]
+    hosts_ipv4_nat_list = [ host.lower() for host in conf['NatHosts'] ]
+    hosts_alias_list = [ h.lower() for h in conf['Aliases'] ]
 
 
 def ping(hostname):
@@ -53,7 +53,7 @@ def get_ipv6_hosts():
     for h in r['status']:
         if not 'IPv6Address' in h or not h['IPv6Address']:
             continue
-        hostname = h['Name']
+        hostname = h['Name'].lower()
         if hostname in hosts_alias_list:
             hostname = hosts_alias_list[hostname]
         for a in h['IPv6Address']:
@@ -105,7 +105,7 @@ def read_zone_list_from_file(zone_filename):
     for host in config:
         for p in config[host]:
             for target in config[host][p].split('\n'):
-                zone_list.append([host, p.upper(), target])
+                zone_list.append([host.lower(), p.upper(), target])
     return zone_list