diff --git a/iotlabcli/parser/common.py b/iotlabcli/parser/common.py
index 1ef9ee5..f4236c4 100644
--- a/iotlabcli/parser/common.py
+++ b/iotlabcli/parser/common.py
@@ -24,6 +24,7 @@
 import argparse
 import contextlib
 import errno
+import os
 import sys
 from argparse import ArgumentParser
 from collections import OrderedDict
@@ -46,6 +47,16 @@
 DOMAIN_DNS = "iot-lab.info"
 
 
+def domain_dns() -> str:
+    """Domain of the sites and nodes: IOTLAB_DOMAIN environment variable
+    (another testbed, e.g. a local testbed), iot-lab.info by default
+
+    >>> domain_dns()
+    'iot-lab.info'
+    """
+    return os.getenv("IOTLAB_DOMAIN") or DOMAIN_DNS
+
+
 def base_parser(user_required: bool = False) -> ArgumentParser:
     """Base parser giving 'user' 'password' and 'version' arguments
     :param user_required: set 'user' argument as required or not"""
@@ -238,10 +249,10 @@ def check_site_with_server(
     raise argparse.ArgumentTypeError(f"Unknown site name {site_name!r}")
 
 
-def site_with_domain_checked(site: str, domain: str = DOMAIN_DNS) -> str:
+def site_with_domain_checked(site: str, domain: str | None = None) -> str:
     """Return site with domain and check site exists."""
     check_site_with_server(site)
-    return f"{site}.{domain}"
+    return f"{site}.{domain or domain_dns()}"
 
 
 def nodes_list_from_info(site: str, archi: str, nodes_str: str) -> list[str]:
@@ -264,7 +275,7 @@ def nodes_list_from_info(site: str, archi: str, nodes_str: str) -> list[str]:
     """
 
     nodes_list = nodes_id_list(archi, nodes_str)
-    fmt = f"%s.{site}.{DOMAIN_DNS}"
+    fmt = f"%s.{site}.{domain_dns()}"
     nodes_url_list = [fmt % node for node in nodes_list]
     return nodes_url_list
 
diff --git a/iotlabcli/tests/common_parser_test.py b/iotlabcli/tests/common_parser_test.py
index 745a287..c918498 100644
--- a/iotlabcli/tests/common_parser_test.py
+++ b/iotlabcli/tests/common_parser_test.py
@@ -23,6 +23,7 @@
 # pylint: disable=too-many-public-methods
 
 import argparse
+import os
 import sys
 import unittest
 from io import StringIO
@@ -268,6 +269,18 @@ def test_site_with_domain_checked(self):
         ret = common.site_with_domain_checked("grenoble", domain="localhost")
         self.assertEqual(ret, "grenoble.localhost")
 
+    @patch.dict(os.environ, {"IOTLAB_DOMAIN": "iotlab.internal"})
+    def test_domain_from_environment(self):
+        """IOTLAB_DOMAIN replaces iot-lab.info in the sites and nodes"""
+        self.assertEqual(common.domain_dns(), "iotlab.internal")
+        self.assertEqual(
+            common.site_with_domain_checked("grenoble"), "grenoble.iotlab.internal"
+        )
+        self.assertEqual(
+            common.nodes_list_from_info("local", "custom", "1-2"),
+            ["custom-1.local.iotlab.internal", "custom-2.local.iotlab.internal"],
+        )
+
 
 class TestHelpAction(unittest.TestCase):
     """Test HelpAction class."""