diff --git a/pnpdevice/server.py b/pnpdevice/server.py
index 24b48d6..f2c63fd 100644
--- a/pnpdevice/server.py
+++ b/pnpdevice/server.py
@@ -37,10 +37,13 @@ def index(request: Request):
 def relay_create_get(request: Request):
 	"Get the form to create a new relay."
 	relays.load_all_pins()
-	pins = relays.pins
+	used_pin_names = {relay.pin.name for relay in relays}
+	pins = [p for p in relays.pins if p.name not in used_pin_names]
+	sorted_pins = sorted(pins, key=lambda p: p.name)
 	return templates.TemplateResponse("relay-create.template.html", {
+		"relays": relays,
 		"request": request,
-		"pins": pins,
+		"pins": sorted_pins,
 	})
 
 @app.post("/relay/create")
diff --git a/templates/relay-create.template.html b/templates/relay-create.template.html
index 84e5dc0..181f453 100644
--- a/templates/relay-create.template.html
+++ b/templates/relay-create.template.html
@@ -1,5 +1,14 @@
 <html>
 <h1>Relay Creation</h1>
+<h2>Existing relays</h2>
+<table>
+  <thead><th>Relay</th><th>Pin</th></thead>
+  <tbody>
+  {% for relay in relays %}
+    <tr><td>{{ relay.name }}</td><td>{{ relay.pin.name }}</td></tr>
+  {% endfor %}
+</table>
+
 <form method="POST" action="/relay/create">
   <input type="text" name="name" placeholder="Pool Pump 1"></input>
   <select name="pin_id">:
