diff --git a/flake.lock b/flake.lock
index f382057..e786722 100644
--- a/flake.lock
+++ b/flake.lock
@@ -216,11 +216,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1713294767,
-        "narHash": "sha256-LmaabaQZdx52MPGKPRt9Opoc9Gd9RbwvCdysUUYQoXI=",
+        "lastModified": 1713453913,
+        "narHash": "sha256-vbXq52VRlL1defMHrwhsoeHm95O3mFefsSSJyNEghbA=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "fa8c16e2452bf092ac76f09ee1fb1e9f7d0796e7",
+        "rev": "178e26895b3aef028a00a32fb7e7ed0fc660645c",
         "type": "github"
       },
       "original": {
diff --git a/hosts/falkenstein/modules/dns/default.nix b/hosts/falkenstein/modules/dns/default.nix
index 6a3c289..4467a00 100644
--- a/hosts/falkenstein/modules/dns/default.nix
+++ b/hosts/falkenstein/modules/dns/default.nix
@@ -1,19 +1,22 @@
 { self, pkgs, lib, config, dns, ... }:
 let
-  modulo = number: mod: (number - ((number / mod) * mod));
   secondary = "185.181.104.96";
   domain = config.networking.domain;
   zonefile = with dns.lib.combinators; pkgs.writeText "rfive.de.zone.txt" (dns.lib.toString domain {
     TTL = 3600;
-    SOA = {
-      nameServer = "ns.rfive.de.";
-      adminEmail = "hostmaster@rfive.de";
-      serial = lib.strings.toInt (builtins.substring 0 8 self.sourceInfo.lastModifiedDate + toString ((modulo self.sourceInfo.lastModified 86400) / 864));
-      refresh = 10800;
-      retry = 3600;
-      expire = 604800;
-      minimum = 3600;
-    };
+    SOA =
+      let
+        modulo = number: mod: (number - ((number / mod) * mod));
+      in
+      {
+        nameServer = "ns.rfive.de.";
+        adminEmail = "hostmaster@rfive.de";
+        serial = lib.strings.toInt (builtins.substring 0 8 self.sourceInfo.lastModifiedDate + toString ((modulo self.sourceInfo.lastModified 86400) / 864));
+        refresh = 10800;
+        retry = 3600;
+        expire = 604800;
+        minimum = 3600;
+      };
     NS = [
       "ns.inwx.de."
       "ns2.inwx.de."
@@ -30,24 +33,29 @@ let
       (spf.soft [ "mx" ])
     ];
 
-    subdomains = lib.attrsets.mergeAttrsList [
-      rec {
-        nuc = {
-          A = [ "141.30.227.6" ];
-        };
-        falkenstein = {
-          A = [ "23.88.121.184" ];
-          AAAA = [ "2a01:4f8:c012:49de::1" ];
-        };
-        ns = falkenstein;
-        mail = falkenstein;
-        _dmarc.TXT = [ "v=DMARC1; p=none; adkim=s; fo=1; rua=mailto:dmarc@rfive.de; ruf=mailto:dmarc@rfive.de" ];
-        _domainkey.subdomains.rspamd.TXT = [ "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDoirUMubro4nlmY6a8JMwK9QB2agAXiJzexDU/7ba6KCggONfoSTfUHlrM/XeM1GG/9oKpngApxDPP97adJuxc8/EELyo4HjTyYD8GBFZhg0AN7V8IPaJ1o5k6dGDk8ZLh41ZCnlAVWkhVSKs5pYtzkrlJIfUSzyuoe8nuFsVe3QIDAQAB" ];
+    subdomains =
+      let
+        getVirtualHosts = hostname: map (name: builtins.substring 0 (builtins.stringLength name - (builtins.stringLength domain + 1)) name) (builtins.attrNames self.nixosConfigurations."${hostname}".config.services.nginx.virtualHosts);
+        genCNAMEs = hostname: lib.attrsets.genAttrs (getVirtualHosts hostname) (label: { CNAME = [ "${hostname}.${domain}." ]; });
+      in
+      lib.attrsets.mergeAttrsList [
+        rec {
+          nuc = {
+            A = [ "141.30.227.6" ];
+          };
+          falkenstein = {
+            A = [ "23.88.121.184" ];
+            AAAA = [ "2a01:4f8:c012:49de::1" ];
+          };
+          ns = falkenstein;
+          mail = falkenstein;
+          _dmarc.TXT = [ "v=DMARC1; p=none; adkim=s; fo=1; rua=mailto:dmarc@rfive.de; ruf=mailto:dmarc@rfive.de" ];
+          _domainkey.subdomains.rspamd.TXT = [ "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDoirUMubro4nlmY6a8JMwK9QB2agAXiJzexDU/7ba6KCggONfoSTfUHlrM/XeM1GG/9oKpngApxDPP97adJuxc8/EELyo4HjTyYD8GBFZhg0AN7V8IPaJ1o5k6dGDk8ZLh41ZCnlAVWkhVSKs5pYtzkrlJIfUSzyuoe8nuFsVe3QIDAQAB" ];
 
-      }
-      (lib.attrsets.genAttrs (map (name: builtins.substring 0 (builtins.stringLength name - (builtins.stringLength domain + 1)) name) (builtins.attrNames self.nixosConfigurations.nuc.config.services.nginx.virtualHosts)) (label: { CNAME = [ "nuc.rfive.de." ]; }))
-      (lib.attrsets.genAttrs (map (name: builtins.substring 0 (builtins.stringLength name - (builtins.stringLength domain + 1)) name) (builtins.attrNames self.nixosConfigurations.falkenstein.config.services.nginx.virtualHosts)) (label: { CNAME = [ "falkenstein.rfive.de." ]; }))
-    ];
+        }
+        (genCNAMEs "nuc")
+        (genCNAMEs "falkenstein")
+      ];
   });
 in
 {