python-zeroconf
diff --git a/‎src/zeroconf/_utils/net.py‎
Lines changed: 11 additions & 3 deletions b/‎src/zeroconf/_utils/net.py‎
Lines changed: 11 additions & 3 deletions
diff --git a/‎tests/utils/test_net.py‎
Lines changed: 29 additions & 0 deletions b/‎tests/utils/test_net.py‎
Lines changed: 29 additions & 0 deletions
@@ -126,13 +126,21 @@ def ip6_addresses_to_indexes(
     :param interfaces: List of IP addresses and indexes.
     :returns: List of indexes.
     """
-    result = []
+    result: list[tuple[tuple[str, int, int], int]] = []
+    needs_scan = [
+        iface
+        for iface in interfaces
+        if isinstance(iface, int) or (isinstance(iface, str) and ipaddress.ip_address(iface).version == 6)
+    ]
+    if not needs_scan:
+        return result
+
     adapters = ifaddr.get_adapters()
 
-    for iface in interfaces:
+    for iface in needs_scan:
         if isinstance(iface, int):
             result.append((interface_index_to_ip6_address(adapters, iface), iface))  # type: ignore[arg-type]
-        elif isinstance(iface, str) and ipaddress.ip_address(iface).version == 6:
+        else:
             result.append(ip6_to_address_and_index(adapters, iface))  # type: ignore[arg-type]
 
     return result
 
@@ -118,6 +118,35 @@ def test_ip6_addresses_to_indexes():
         assert netutils.ip6_addresses_to_indexes(interfaces_2) == [(("2001:db8::", 1, 1), 1)]
 
 
+@pytest.mark.parametrize("interfaces", [[], ["192.168.1.5"], ["192.168.1.5", "169.254.3.2"]])
+def test_ip6_addresses_to_indexes_skips_scan_without_ipv6(interfaces: list[str]) -> None:
+    """Test the adapters are not scanned when there are no IPv6 entries."""
+    with patch("zeroconf._utils.net.ifaddr.get_adapters") as mock_get_adapters:
+        assert netutils.ip6_addresses_to_indexes(interfaces) == []
+    mock_get_adapters.assert_not_called()
+
+
+def test_ip6_addresses_to_indexes_scans_once() -> None:
+    """Test the adapters are scanned once for a mixed list."""
+    with patch(
+        "zeroconf._utils.net.ifaddr.get_adapters",
+        return_value=_generate_mock_adapters(),
+    ) as mock_get_adapters:
+        assert netutils.ip6_addresses_to_indexes(["192.168.1.5", "2001:db8::", 1, "fd00:db8::"]) == [
+            (("2001:db8::", 1, 1), 1),
+            (("2001:db8::", 1, 1), 1),
+            (("fd00:db8::", 1, 1), 1),
+        ]
+    mock_get_adapters.assert_called_once()
+
+
+def test_normalize_interface_choice_ipv4_list_skips_scan() -> None:
+    """Test an IPv4 only list is normalized without scanning the adapters."""
+    with patch("zeroconf._utils.net.ifaddr.get_adapters") as mock_get_adapters:
+        assert netutils.normalize_interface_choice(["192.168.1.5"]) == ["192.168.1.5"]
+    mock_get_adapters.assert_not_called()
+
+
 def test_normalize_interface_choice_errors():
     """Test we generate exception on invalid input."""
     with (