diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cf3ba77..412dd608 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   [#243](https://github.com/fabric-testbed/fabrictestbed-extensions/issues/243),
   PR [#251](https://github.com/fabric-testbed/fabrictestbed-extensions/pull/251))
 
+### Changed
+
+- Use defaults for FABRIC CM, orchestrator and bastion hosts (Issue
+  [#258](https://github.com/fabric-testbed/fabrictestbed-extensions/issues/258))
+
 
 ## [1.5.5]
 
diff --git a/fabrictestbed_extensions/fablib/fablib.py b/fabrictestbed_extensions/fablib/fablib.py
index aa02b776..c54305eb 100644
--- a/fabrictestbed_extensions/fablib/fablib.py
+++ b/fabrictestbed_extensions/fablib/fablib.py
@@ -573,6 +573,10 @@ class FablibManager:
         "CRITICAL": logging.CRITICAL,
     }
 
+    DEFAULT_FABRIC_CREDMGR_HOST = "cm.fabric-testbed.net"
+    DEFAULT_FABRIC_ORCHESTRATOR_HOST = "orchestrator.fabric-testbed.net"
+    DEFAULT_FABRIC_BASTION_HOST = "bastion.fabric-testbed.net"
+
     default_fabric_rc = os.environ["HOME"] + "/work/fabric_config/fabric_rc"
     default_log_level = "DEBUG"
     default_log_file = "/tmp/fablib/fablib.log"
@@ -784,6 +788,15 @@ def __init__(
         self.bastion_private_ipv4_addr = "0.0.0.0"
         self.bastion_private_ipv6_addr = "0:0:0:0:0:0"
 
+        if self.credmgr_host is None:
+            self.credmgr_host = self.DEFAULT_FABRIC_CREDMGR_HOST
+
+        if self.orchestrator_host is None:
+            self.orchestrator_host = self.DEFAULT_FABRIC_ORCHESTRATOR_HOST
+
+        if self.bastion_public_addr is None:
+            self.bastion_public_addr = self.DEFAULT_FABRIC_BASTION_HOST
+
         self._validate_configuration()
 
         # Create slice manager