diff --git a/Cargo.lock b/Cargo.lock
index 9347958..041f73d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -448,6 +448,12 @@ version = "0.2.158"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
 
+[[package]]
+name = "macaddr"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baee0bbc17ce759db233beb01648088061bf678383130602a298e6998eedb2d8"
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
@@ -675,6 +681,7 @@ dependencies = [
  "glob",
  "gtk4",
  "libadwaita",
+ "macaddr",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index b562951..49bd35f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,8 +11,9 @@ publish = false
 build = "build.rs"
 
 [dependencies]
-gtk = { package = "gtk4", version = "0.9.1", features = ["gnome_46"] }
 adw = { package = "libadwaita", version = "0.7.0", features = ["v1_5"] }
+gtk = { package = "gtk4", version = "0.9.1", features = ["gnome_46"] }
+macaddr = { version = "1.0.1", default-features = false }
 
 [build-dependencies]
 glib-build-tools = "0.20.0"
diff --git a/resources/ui/add-device-dialog.blp b/resources/ui/add-device-dialog.blp
index f7cb022..79ac8b1 100644
--- a/resources/ui/add-device-dialog.blp
+++ b/resources/ui/add-device-dialog.blp
@@ -53,9 +53,16 @@ template $AddDeviceDialog: Adw.Dialog {
 
         Adw.EntryRow {
           title: _("_MAC address");
-          tooltip-text: _("Te hardware address for this device");
+          tooltip-text: _("The hardware address for this device");
           input-hints: no_emoji | no_spellcheck | uppercase_chars | private;
           use-underline: true;
+          text: bind template.mac_address bidirectional;
+
+          [suffix]
+          $ValidationIndicator {
+            is_valid: bind template.mac_address_valid;
+            feedback: _("This is no valid 48-bit MAC address.");
+          }
         }
 
         Adw.EntryRow {
diff --git a/resources/ui/add-device-dialog.ui b/resources/ui/add-device-dialog.ui
index 9a92465..f90c61b 100644
--- a/resources/ui/add-device-dialog.ui
+++ b/resources/ui/add-device-dialog.ui
@@ -57,9 +57,16 @@ corresponding .blp file and regenerate this file with blueprint-compiler.
                 <child>
                   <object class="AdwEntryRow">
                     <property name="title" translatable="yes">_MAC address</property>
-                    <property name="tooltip-text" translatable="yes">Te hardware address for this device</property>
+                    <property name="tooltip-text" translatable="yes">The hardware address for this device</property>
                     <property name="input-hints">1024|2|16|2048</property>
                     <property name="use-underline">true</property>
+                    <property name="text" bind-source="AddDeviceDialog" bind-property="mac_address" bind-flags="sync-create|bidirectional"/>
+                    <child type="suffix">
+                      <object class="ValidationIndicator">
+                        <property name="is_valid" bind-source="AddDeviceDialog" bind-property="mac_address_valid" bind-flags="sync-create"/>
+                        <property name="feedback" translatable="yes">This is no valid 48-bit MAC address.</property>
+                      </object>
+                    </child>
                   </object>
                 </child>
                 <child>
diff --git a/src/widgets/add_device_dialog.rs b/src/widgets/add_device_dialog.rs
index e97b07b..6cae42c 100644
--- a/src/widgets/add_device_dialog.rs
+++ b/src/widgets/add_device_dialog.rs
@@ -49,6 +49,10 @@ mod imp {
         #[property(get)]
         pub label_valid: Cell<bool>,
         #[property(get, set)]
+        pub mac_address: RefCell<String>,
+        #[property(get)]
+        pub mac_address_valid: Cell<bool>,
+        #[property(get, set)]
         pub host: RefCell<String>,
         #[property(get, default = "empty")]
         pub host_indicator: RefCell<String>,
@@ -67,6 +71,17 @@ mod imp {
             self.obj().notify_is_valid();
         }
 
+        fn is_mac_address_valid(&self) -> bool {
+            let text = self.mac_address.borrow();
+            !text.is_empty() && macaddr::MacAddr::from_str(&text).is_ok()
+        }
+
+        fn validate_mac_address(&self) {
+            self.mac_address_valid.set(self.is_mac_address_valid());
+            self.obj().notify_mac_address_valid();
+            self.obj().notify_is_valid();
+        }
+
         fn validate_host(&self) {
             let host = self.host.borrow();
             let indicator = match IpAddr::from_str(&host) {
@@ -86,6 +101,7 @@ mod imp {
 
         fn validate_all(&self) {
             self.validate_label();
+            self.validate_mac_address();
             self.validate_host();
         }
 
@@ -104,9 +120,11 @@ mod imp {
 
         fn new() -> Self {
             Self {
-                label: RefCell::new(String::new()),
-                label_valid: Cell::new(false),
-                host: RefCell::new(String::new()),
+                label: Default::default(),
+                label_valid: Default::default(),
+                mac_address: Default::default(),
+                mac_address_valid: Default::default(),
+                host: Default::default(),
                 host_indicator: RefCell::new("empty".to_string()),
                 is_valid: (),
             }
@@ -131,6 +149,9 @@ mod imp {
             self.obj().connect_label_notify(|dialog| {
                 dialog.imp().validate_label();
             });
+            self.obj().connect_mac_address_notify(|dialog| {
+                dialog.imp().validate_mac_address();
+            });
             self.obj().connect_host_notify(|dialog| {
                 dialog.imp().validate_host();
             });