diff --git a/diagnostic/index.html b/diagnostic/index.html
index 58fdecc..7505ca2 100644
--- a/diagnostic/index.html
+++ b/diagnostic/index.html
@@ -4902,7 +4902,8 @@
           (scanning ? ' disabled' : '') + '>Geraete scannen</button>' +
           '</div>' +
           '<div style="color:#8888AA;font-size:11px;margin-top:4px;">kann: ' + escapeHtml(caps) + ' · ' + ctrl +
-          (s.net && s.net.primary_ip ? ' · Netz: ' + escapeHtml(s.net.primary_ip) : '') + '</div>' +
+          (s.net && s.net.primary_ip ? ' · Netz: ' + escapeHtml(s.net.primary_ip) : '') +
+          (s.net && s.net.mac ? ' · MAC: <span style="font-family:monospace;">' + escapeHtml(s.net.mac) + '</span>' : '') + '</div>' +
           (s.net && s.net.warning ? '<div style="color:#FF6E6E;font-size:11px;margin-top:6px;padding:6px;background:#3A1F1F;border-radius:4px;">⚠ ' + escapeHtml(s.net.warning) + '</div>' : '') +
           devHtml +
           '</div>';
diff --git a/satellite/satellite.py b/satellite/satellite.py
index 80338d9..d81e448 100644
--- a/satellite/satellite.py
+++ b/satellite/satellite.py
@@ -333,7 +333,48 @@ def _net_context() -> dict:
                    "mDNS/SSDP erreichen die realen Geraete so nicht. Auf Docker Desktop "
                    "(Mac/Windows) geht LAN-Discovery nicht — den Satelliten NATIV (python "
                    "satellite.py) oder auf einem Linux-Host im Ziel-LAN betreiben.")
-    return {"primary_ip": p, "ips": ips, "warning": warning}
+    return {"primary_ip": p, "ips": ips, "mac": _own_mac(p), "warning": warning}
+
+
+def _own_mac(ip: str) -> str:
+    """MAC der eigenen (primaeren) Netzwerkkarte — identifiziert die Kiste
+    eindeutig (DHCP-Reservierung, WOL). Liest /sys/class/net (Linux); faellt auf
+    uuid.getnode() zurueck, wenn das Interface nicht zuzuordnen ist."""
+    import subprocess
+    try:
+        base = "/sys/class/net"
+        if os.path.isdir(base):
+            # Interface zur primaeren IP finden (ueber die Adressen im /proc-Netz).
+            want = ""
+            if ip:
+                try:
+                    out = subprocess.run(["ip", "-o", "-4", "addr", "show"],
+                                         capture_output=True, text=True, timeout=3).stdout
+                    for line in out.splitlines():
+                        parts = line.split()
+                        if len(parts) >= 4 and parts[3].split("/")[0] == ip:
+                            want = parts[1]
+                            break
+                except Exception:
+                    pass
+            names = [want] if want else []
+            names += [n for n in sorted(os.listdir(base)) if n != "lo" and n not in names]
+            for n in names:
+                try:
+                    with open(os.path.join(base, n, "address"), "r") as f:
+                        mac = f.read().strip()
+                    if mac and mac != "00:00:00:00:00:00":
+                        return mac.lower()
+                except Exception:
+                    continue
+    except Exception:
+        pass
+    try:
+        import uuid
+        node = uuid.getnode()
+        return ":".join(f"{(node >> e) & 0xFF:02x}" for e in range(40, -8, -8))
+    except Exception:
+        return ""
 
 
 NET = _net_context()
@@ -1686,7 +1727,8 @@ class Satellite:
 def main() -> None:
     logger.info("ARIA Satellit startet — id=%s location=%s control=%s",
                 SATELLITE_ID, SATELLITE_LOCATION, CONTROL_ENABLED)
-    logger.info("Netz: primary_ip=%s alle=%s", NET.get("primary_ip"), NET.get("ips"))
+    logger.info("Netz: primary_ip=%s mac=%s alle=%s",
+                NET.get("primary_ip"), NET.get("mac") or "?", NET.get("ips"))
     if NET.get("warning"):
         logger.warning("⚠ %s", NET["warning"])
     try: