diff --git a/cluster/staging/node/df-pw5.nix b/cluster/staging/node/df-pw5.nix
index e1a132c..2f20f1c 100644
--- a/cluster/staging/node/df-pw5.nix
+++ b/cluster/staging/node/df-pw5.nix
@@ -10,7 +10,7 @@
   boot.loader.timeout = 20;
 
   deuxfleurs.hostName = "df-pw5";
-  deuxfleurs.staticIPv4.address = "192.168.5.130/24";
+  deuxfleurs.staticIPv4.address = "192.168.5.130";
   deuxfleurs.staticIPv6.address = "2a02:a03f:6510:5102:223:24ff:feb0:e8a7";
 
   system.stateVersion = "22.11";
diff --git a/cluster/staging/node/origan.nix b/cluster/staging/node/origan.nix
index 6906f4d..49ecbbf 100644
--- a/cluster/staging/node/origan.nix
+++ b/cluster/staging/node/origan.nix
@@ -9,7 +9,7 @@
   boot.loader.efi.canTouchEfiVariables = true;
 
   deuxfleurs.hostName = "origan";
-  deuxfleurs.staticIPv4.address = "192.168.1.33/24";
+  deuxfleurs.staticIPv4.address = "192.168.1.33";
   deuxfleurs.staticIPv6.address = "2a01:e0a:5e4:1d0:223:24ff:feaf:fdec";
   deuxfleurs.isRaftServer = true;
 
diff --git a/cluster/staging/node/piranha.nix b/cluster/staging/node/piranha.nix
index bc1aa03..896f169 100644
--- a/cluster/staging/node/piranha.nix
+++ b/cluster/staging/node/piranha.nix
@@ -9,7 +9,7 @@
   boot.loader.efi.canTouchEfiVariables = true;
 
   deuxfleurs.hostName = "piranha";
-  deuxfleurs.staticIPv4.address = "192.168.1.25/24";
+  deuxfleurs.staticIPv4.address = "192.168.1.25";
   deuxfleurs.staticIPv6.address = "2a01:cb05:9142:7400:223:24ff:feb0:ea82";
   deuxfleurs.isRaftServer = true;
 
diff --git a/nix/deuxfleurs.nix b/nix/deuxfleurs.nix
index 57486c2..74a5734 100644
--- a/nix/deuxfleurs.nix
+++ b/nix/deuxfleurs.nix
@@ -37,6 +37,11 @@ in
       type = nullOr str;
       default = null;
     };
+    staticIPv4.prefixLength = mkOption {
+      description = "IPv4 prefix length for LAN addresses, only used with static configuration";
+      type = int;
+      default = 24;
+    };
     staticIPv6.defaultGateway = mkOption {
       description = ''
         IPv6 address of the default route on the local network interface.
@@ -161,7 +166,7 @@ in
         matchConfig.Name = "en* eth*";
 
         address =
-          optional noDHCP "${cfg.staticIPv4.address}"
+          optional noDHCP "${cfg.staticIPv4.address}/${toString cfg.staticIPv4.prefixLength}"
           ++ optional noRA "${cfg.staticIPv6.address}/${toString cfg.staticIPv6.prefixLength}";
 
         routes =