diff --git a/fastapi-vue/fastapi_vue/hostutil.py b/fastapi-vue/fastapi_vue/hostutil.py
index 6b2d893..50bee9b 100644
--- a/fastapi-vue/fastapi_vue/hostutil.py
+++ b/fastapi-vue/fastapi_vue/hostutil.py
@@ -12,6 +12,7 @@ def parse_endpoint(value: str | None, default_port: int = 0) -> list[dict]:
 
     Returns:
         List of dicts with uvicorn bind kwargs (host/port or uds).
+        Two entries may be returned for IPv4 and IPv6 (all interaces).
 
     Supported forms:
     - None or empty -> [{host: "localhost", port: default_port}]
@@ -65,3 +66,19 @@ def parse_endpoint(value: str | None, default_port: int = 0) -> list[dict]:
         ipaddress.ip_address(host)
 
     return [{"host": host, "port": port}]
+
+
+def parse_endpoints(
+    listen: str | list[str] | None = None, default_port: int = 8000
+) -> list[dict]:
+    """Parse listen strings into a list of endpoint dicts.
+
+    Args:
+        listen: Endpoint string(s) (see parse_endpoint for formats).
+        default_port: Port to use when not specified in listen args.
+    """
+    if listen is None:
+        listen = [f"localhost:{default_port}"]
+    elif isinstance(listen, str):
+        listen = [listen]
+    return [ep for s in listen for ep in parse_endpoint(s, default_port)]
diff --git a/fastapi-vue/fastapi_vue/server.py b/fastapi-vue/fastapi_vue/server.py
index f57fceb..503112f 100644
--- a/fastapi-vue/fastapi_vue/server.py
+++ b/fastapi-vue/fastapi_vue/server.py
@@ -6,7 +6,7 @@ from contextlib import suppress
 import uvicorn
 from uvicorn import Config, Server
 
-from .hostutil import parse_endpoint
+from .hostutil import parse_endpoints
 
 logger = logging.getLogger(__name__)
 
@@ -30,13 +30,9 @@ def run(
         workers: Number of worker processes (requires uvicorn.run, single endpoint only).
         **uvicorn_config: Additional uvicorn config options (overrides all other settings).
     """
-    if listen is None:
-        listen = [f"localhost:{default_port}"]
-    elif isinstance(listen, str):
-        listen = [listen]
-    endpoints: list[dict] = []
-    for ep in listen:
-        endpoints.extend(parse_endpoint(ep, default_port))
+    endpoints = parse_endpoints(listen, default_port)
+    if not endpoints:
+        raise ValueError("No endpoints to serve; check listen configuration")
 
     conf: dict[str, object] = {"app": app, "reload": reload, "workers": workers}
     proxy = os.getenv("FORWARDED_ALLOW_IPS", "127.0.0.1,::1")