diff --git a/frontend/src/lib/components/DeviceForm.svelte b/frontend/src/lib/components/DeviceForm.svelte
index 8d299324..cf744848 100644
--- a/frontend/src/lib/components/DeviceForm.svelte
+++ b/frontend/src/lib/components/DeviceForm.svelte
@@ -231,7 +231,7 @@
 					<input
 						id="device-netmask"
 						type="text"
-						placeholder="255.255.255.0"
+						placeholder="255.255.255.255"
 						class="input w-full max-w-xs"
 						bind:value={device.netmask}
 						required
diff --git a/frontend/src/lib/components/NetworkScan.svelte b/frontend/src/lib/components/NetworkScan.svelte
index 2734b261..897a0b97 100644
--- a/frontend/src/lib/components/NetworkScan.svelte
+++ b/frontend/src/lib/components/NetworkScan.svelte
@@ -219,7 +219,7 @@
 							id="replaceNetmaskInput"
 							class="input input-bordered"
 							type="text"
-							placeholder="255.255.0.0"
+							placeholder="255.255.255.0"
 							bind:value={replaceNetmask}
 						/>
 					</div>