diff --git a/admin/admin.css b/admin/admin.css
index 07817e7..92fb01d 100644
--- a/admin/admin.css
+++ b/admin/admin.css
@@ -325,6 +325,35 @@ textarea {
     margin-bottom: 10px;
 }
 
+#network-info-box {
+    margin-top: 0;
+    margin-bottom: 16px;
+}
+
+.network-info-table {
+    width: 100%;
+    border-collapse: collapse;
+    font-size: 12px;
+}
+
+.network-info-table th,
+.network-info-table td {
+    text-align: left;
+    padding: 6px 10px;
+    border-bottom: 1px solid rgba(92, 148, 252, 0.3);
+}
+
+.network-info-table th {
+    font-family: 'Press Start 2P', monospace;
+    font-size: 8px;
+    color: #b4d4ec;
+}
+
+.network-info-table td {
+    color: #54fc54;
+    font-family: 'Courier New', monospace;
+}
+
 /* Toast Notification */
 .toast {
     position: fixed;
diff --git a/admin/admin.html b/admin/admin.html
index 7114f3b..aeb4d84 100644
--- a/admin/admin.html
+++ b/admin/admin.html
@@ -76,6 +76,10 @@
             <!-- Receivers Tab -->
             <section id="tab-receivers" class="tab-pane hidden">
                 <h2>Receiver Configuration</h2>
+                <div id="network-info-box" class="info-box">
+                    <h3>Host Network</h3>
+                    <div id="network-info">Loading...</div>
+                </div>
                 <div class="form-group">
                     <label>Discovery Mode</label>
                     <select id="receiver-mode">
@@ -91,6 +95,10 @@
                     <label>Receiver Port</label>
                     <input type="number" id="receiver-port" value="30003" min="1" max="65535">
                 </div>
+                <div class="form-group">
+                    <label>Custom Subnet (optional)</label>
+                    <input type="text" id="scan-subnet" placeholder="e.g. 10.0.0.0/24 (leave empty to scan all local subnets)">
+                </div>
                 <div class="button-row">
                     <button id="scan-receivers-btn" class="btn">SCAN NOW</button>
                     <button id="restart-receivers-btn" class="btn">RESTART CONNECTIONS</button>
diff --git a/admin/admin.js b/admin/admin.js
index 5e5a6c9..c3aff6e 100644
--- a/admin/admin.js
+++ b/admin/admin.js
@@ -27,6 +27,7 @@
         adminPanel.classList.remove('hidden');
         loadConfig();
         loadThemes();
+        loadNetworkInfo();
         refreshStatus();
         statusInterval = setInterval(refreshStatus, 5000);
     }
@@ -170,6 +171,31 @@
         } catch (e) { /* ignore */ }
     }
 
+    // ------- Network Info -------
+    async function loadNetworkInfo() {
+        const el = document.getElementById('network-info');
+        if (!el) return;
+        try {
+            const res = await fetch('/api/admin/network-info');
+            if (!res.ok) { el.textContent = 'Failed to load'; return; }
+            const data = await res.json();
+            const ifaces = data.interfaces || [];
+            if (!ifaces.length) {
+                el.textContent = 'No network interfaces found';
+                return;
+            }
+            let html = '<table class="network-info-table">';
+            html += '<tr><th>Interface</th><th>IP Address</th><th>Network</th></tr>';
+            ifaces.forEach(i => {
+                html += `<tr><td>${i.name}</td><td>${i.ip}</td><td>${i.network}</td></tr>`;
+            });
+            html += '</table>';
+            el.innerHTML = html;
+        } catch (e) {
+            el.textContent = 'Error loading network info';
+        }
+    }
+
     // ------- Receivers -------
     function toggleManualIps(mode) {
         document.getElementById('manual-ips-group').classList.toggle('hidden', mode === 'AUTO');
@@ -184,12 +210,20 @@
         btn.textContent = 'SCANNING...';
         btn.disabled = true;
         try {
-            const res = await fetch('/api/admin/scan-receivers', { method: 'POST' });
+            const subnet = (document.getElementById('scan-subnet').value || '').trim();
+            const fetchOpts = { method: 'POST' };
+            if (subnet) {
+                fetchOpts.headers = { 'Content-Type': 'application/json' };
+                fetchOpts.body = JSON.stringify({ subnet });
+            }
+            const res = await fetch('/api/admin/scan-receivers', fetchOpts);
             const data = await res.json();
             const box = document.getElementById('scan-results');
             const list = document.getElementById('scan-results-list');
             box.classList.remove('hidden');
-            if (data.receivers && data.receivers.length) {
+            if (data.error) {
+                list.textContent = data.error;
+            } else if (data.receivers && data.receivers.length) {
                 list.textContent = data.receivers.join(', ');
             } else {
                 list.textContent = 'No receivers found on network';
diff --git a/server.py b/server.py
index bd8a80c..267695d 100755
--- a/server.py
+++ b/server.py
@@ -302,6 +302,25 @@ async def connect_to_receiver(host: str, port: int = 30003):
             await asyncio.sleep(reconnect_delay)
 
 
+async def _scan_subnet(network, port):
+    """Scan a single subnet for hosts with an open port. Returns list of IPs."""
+    found = []
+    print(f"Scanning {network} ({network.num_addresses} hosts) on port {port}...")
+    host_ips = [str(host) for host in network.hosts()]
+
+    async def check_ip(test_ip):
+        if await test_port(test_ip, port):
+            return test_ip
+        return None
+
+    results = await asyncio.gather(*[check_ip(h) for h in host_ips])
+    for result in results:
+        if result:
+            print(f"Found receiver at {result}:{port}")
+            found.append(result)
+    return found
+
+
 async def scan_for_receivers():
     """Scan local network for ADS-B receivers on configured port"""
     port = config['receiver_port']
@@ -317,20 +336,7 @@ async def scan_for_receivers():
                 if ip and netmask and not ip.startswith('127.'):
                     try:
                         network = ipaddress.IPv4Network(f"{ip}/{netmask}", strict=False)
-                        print(f"Scanning {network} ({network.num_addresses} hosts)...")
-
-                        host_ips = [str(host) for host in network.hosts()]
-
-                        async def check_ip(test_ip):
-                            if await test_port(test_ip, port):
-                                return test_ip
-                            return None
-
-                        results = await asyncio.gather(*[check_ip(h) for h in host_ips])
-                        for result in results:
-                            if result:
-                                print(f"Found receiver at {result}:{port}")
-                                found.append(result)
+                        found.extend(await _scan_subnet(network, port))
                     except ValueError as e:
                         print(f"Invalid network {ip}/{netmask}: {e}")
 
@@ -856,10 +862,58 @@ async def handle_admin_password(request):
     return web.json_response({"ok": True})
 
 
+@require_auth
+async def handle_admin_network_info(request):
+    """GET /api/admin/network-info - Return the server's network interfaces."""
+    interfaces = []
+    for iface in netifaces.interfaces():
+        addrs = netifaces.ifaddresses(iface)
+        if netifaces.AF_INET in addrs:
+            for addr in addrs[netifaces.AF_INET]:
+                ip = addr.get('addr')
+                netmask = addr.get('netmask')
+                if ip and netmask and not ip.startswith('127.'):
+                    try:
+                        network = ipaddress.IPv4Network(f"{ip}/{netmask}", strict=False)
+                        interfaces.append({
+                            "name": iface,
+                            "ip": ip,
+                            "netmask": netmask,
+                            "network": str(network)
+                        })
+                    except ValueError:
+                        pass
+    return web.json_response({"interfaces": interfaces})
+
+
 @require_auth
 async def handle_admin_scan_receivers(request):
     """POST /api/admin/scan-receivers - Trigger a receiver scan."""
-    found = await scan_for_receivers()
+    # Check for optional subnet in request body
+    subnet = None
+    try:
+        body = await request.json()
+        subnet = body.get("subnet")
+    except:
+        pass  # No body or invalid JSON — fall back to full scan
+
+    if subnet:
+        # Validate and scan a specific subnet
+        try:
+            network = ipaddress.IPv4Network(subnet, strict=False)
+        except (ValueError, TypeError):
+            return web.json_response(
+                {"error": f"Invalid subnet: {subnet}"}, status=400)
+
+        if network.prefixlen < 20:
+            return web.json_response(
+                {"error": "Subnet too large (max /20 = 4096 hosts)"}, status=400)
+
+        port = config['receiver_port']
+        found = await _scan_subnet(network, port)
+    else:
+        found = await scan_for_receivers()
+
     return web.json_response({"receivers": found})
 
 
@@ -1046,6 +1100,7 @@ async def start_http_server():
     app.router.add_put('/api/admin/themes/{id}', handle_admin_theme_rename)
     app.router.add_post('/api/admin/themes/{id}/{direction}', handle_admin_theme_upload)
     app.router.add_post('/api/admin/password', handle_admin_password)
+    app.router.add_get('/api/admin/network-info', handle_admin_network_info)
     app.router.add_post('/api/admin/scan-receivers', handle_admin_scan_receivers)
     app.router.add_post('/api/admin/restart-receivers', handle_admin_restart_receivers)
     app.router.add_get('/api/admin/sprites', handle_admin_sprites)