diff --git a/CHANGES.rst b/CHANGES.rst
index 5d4984b1..0ca9542a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -44,6 +44,7 @@ New Features
   * ophyd-registry
 
 * Build ``oregistry`` of all ophyd objects.
+* Post a warning if at APS but not on controls subnet.
 
 Maintenance
 ------------
diff --git a/bluesky/instrument/framework/initialize.py b/bluesky/instrument/framework/initialize.py
index b44676da..34c3a8f3 100644
--- a/bluesky/instrument/framework/initialize.py
+++ b/bluesky/instrument/framework/initialize.py
@@ -22,6 +22,7 @@
 sys.path.append(str(pathlib.Path(__file__).absolute().parent.parent.parent))
 
 from .. import iconfig
+from apstools.utils import warn_if_not_aps_controls_subnet
 from bluesky import RunEngine
 from bluesky import SupplementalData
 from bluesky.callbacks.best_effort import BestEffortCallback
@@ -42,6 +43,9 @@
 import bluesky.preprocessors as bpp  # noqa
 import numpy as np  # noqa
 
+# Post a warning if at APS but not on controls subnet.
+warn_if_not_aps_controls_subnet()
+
 
 def get_md_path():
     path = iconfig.get("RUNENGINE_MD_PATH")
@@ -52,12 +56,10 @@ def get_md_path():
     logger.info("RunEngine metadata saved in directory: %s", str(path))
     return str(path)
 
-
 # Set up a RunEngine and use metadata backed PersistentDict
 RE = RunEngine({})
 RE.md = PersistentDict(get_md_path())
 
-
 # Connect with our mongodb database
 catalog_name = iconfig.get("DATABROKER_CATALOG", "training")
 # databroker v2 api
@@ -68,7 +70,6 @@ def get_md_path():
     cat = databroker.temp().v2
     logger.info("using TEMPORARY databroker catalog '%s'", cat.name)
 
-
 # Subscribe metadatastore to documents.
 # If this is removed, data is not saved to metadatastore.
 RE.subscribe(cat.v1.insert)