diff --git a/src/olympia/amo/fields.py b/src/olympia/amo/fields.py
index ffbc251f3472..9fad7739cc86 100644
--- a/src/olympia/amo/fields.py
+++ b/src/olympia/amo/fields.py
@@ -120,7 +120,11 @@ def to_python(self, value):
         value = value.strip()
 
         try:
-            return ipaddress.ip_network(value)
+            # We pass strict=False to allow networks with host bits from the
+            # database to avoid generating an exception even though they should
+            # not have passed validation in case they were added by automation.
+            # It should still represent the correct network anyway.
+            return ipaddress.ip_network(value, strict=False)
         except Exception as exc:
             raise exceptions.ValidationError(exc) from exc
 
diff --git a/src/olympia/amo/tests/test_fields.py b/src/olympia/amo/tests/test_fields.py
index bf84836bf3ab..7cdbd014e913 100644
--- a/src/olympia/amo/tests/test_fields.py
+++ b/src/olympia/amo/tests/test_fields.py
@@ -123,6 +123,12 @@ def test_validates_ip4_cidr(self):
 
         self.field.clean('127.0.0.0/28')
 
+    def test_to_python(self):
+        # Technically invalid because it has the same bits set as the netmask
+        # but we want to be able to load those from the db.
+        assert self.field.to_python('127.0.0.1/28')
+        assert self.field.to_python('::1/28')
+
 
 class TestIPAddressBinaryField(TestCase):
     def test_from_db_value(self):