diff --git a/napalm_opnsense/opnsense.py b/napalm_opnsense/opnsense.py
index 89dae3d..c8fdc2a 100644
--- a/napalm_opnsense/opnsense.py
+++ b/napalm_opnsense/opnsense.py
@@ -220,6 +220,11 @@ class OPNsenseDriver(OPNsensePingMixin, FirewallDriver):
         Each entry contains NAPALM standard keys:
         ``is_up``, ``is_enabled``, ``description``, ``last_flapped``,
         ``mac_address``, ``speed``, ``mtu``.
+
+        Plus one non-standard key, ``identifier``: OPNsense's *assigned*
+        interface name ("lan", "opt1"), as opposed to the physical device the
+        dict is keyed by ("em0"). Empty for unassigned interfaces. This is the
+        name :meth:`send_wake_on_lan` requires — see the note there.
         """
         data = self._get("/api/interfaces/overview/export")
         interfaces: dict[str, dict[str, Any]] = {}
@@ -240,6 +245,7 @@ class OPNsenseDriver(OPNsensePingMixin, FirewallDriver):
                 "mac_address": (iface.get("macaddr") or iface.get("mac") or "").lower(),
                 "speed": float(iface["speed_mbps"]) if iface.get("speed_mbps") else 0.0,
                 "mtu": int(iface["mtu"]) if iface.get("mtu") else 0,
+                "identifier": iface.get("identifier") or "",
             }
 
         return interfaces
diff --git a/tests/unit/test_driver.py b/tests/unit/test_driver.py
index 906b789..21b7970 100644
--- a/tests/unit/test_driver.py
+++ b/tests/unit/test_driver.py
@@ -61,6 +61,31 @@ INTERFACES_RESPONSE = {
     ]
 }
 
+# Bare-list shape with the "identifier" field: OPNsense's assigned interface
+# name, distinct from the physical "device" the dict is keyed by. Wake-on-LAN
+# is addressed by the former, everything else in this driver by the latter.
+IDENTIFIED_INTERFACES_RESPONSE = [
+    {
+        "device": "em0",
+        "identifier": "lan",
+        "description": "LAN",
+        "status": "up",
+        "enabled": True,
+        "macaddr": "AA:BB:CC:DD:EE:FF",
+        "speed_mbps": 1000,
+        "mtu": 1500,
+    },
+    {
+        "device": "em1",
+        "identifier": "opt1",
+        "description": "GUEST",
+        "status": "down",
+        "enabled": True,
+        "macaddr": "AA:BB:CC:DD:EE:00",
+        "mtu": 1500,
+    },
+]
+
 # Real shape confirmed against a live OPNsense 24.7 instance's
 # GET /api/interfaces/overview/export (see issue #14): a bare top-level list
 # of interface dicts, addressed via "device" and CIDR "addr4"/"addr6"
@@ -262,6 +287,20 @@ class TestGetInterfaces:
         ifaces = driver.get_interfaces()
         assert ifaces["em0"]["last_flapped"] == -1.0
 
+    def test_identifier_passed_through(self, driver):
+        # OPNsense's *assigned* name, which is what send_wake_on_lan() needs —
+        # the dict key is the physical device ("em0"), which it rejects.
+        driver._get = lambda path: IDENTIFIED_INTERFACES_RESPONSE
+        ifaces = driver.get_interfaces()
+        assert ifaces["em0"]["identifier"] == "lan"
+        assert ifaces["em1"]["identifier"] == "opt1"
+
+    def test_identifier_empty_when_unassigned(self, driver):
+        # An interface OPNsense has not assigned carries no identifier.
+        driver._get = lambda path: INTERFACES_RESPONSE
+        ifaces = driver.get_interfaces()
+        assert ifaces["em0"]["identifier"] == ""
+
     def test_empty_response(self, driver):
         driver._get = lambda path: {"interfaces": []}
         assert driver.get_interfaces() == {}