diff --git a/locale/fr/LC_MESSAGES/tiramisu.po b/locale/fr/LC_MESSAGES/tiramisu.po
index 18c79ad..eb8b124 100644
--- a/locale/fr/LC_MESSAGES/tiramisu.po
+++ b/locale/fr/LC_MESSAGES/tiramisu.po
@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Tiramisu\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2024-12-15 11:03+0100\n"
+"POT-Creation-Date: 2025-02-07 07:55+0100\n"
 "PO-Revision-Date: \n"
 "Last-Translator: Emmanuel Garette <egarette@cadoles.com>\n"
 "Language-Team: Tiramisu's team <egarette@cadoles.com>\n"
@@ -205,14 +205,16 @@ msgstr ""
 "l'option {0} n'est pas une dynoptiondescription ou n'est pas dans une "
 "dynoptiondescription"
 
-#: tiramisu/autolib.py:685
+#: tiramisu/autolib.py:687
 msgid ""
-"cannot calculate arguments for \"{0}\", cannot find dynamic variable \"{1}\""
+"cannot calculate arguments for \"{0}\", cannot find dynamic variable \"{1}\" "
+"with identifier \"{2}\", list of valid identifiers: {3}"
 msgstr ""
-"impossible de calculer les arguments de \"{0}\", la variable dynamic \"{1}\" "
-"ne peut être trouvée"
+"impossible de calculer les arguments de \"{0}\", ne peut trouver la variable "
+"dynamique \"{1}\" avec l'identifiant \"{2}\", voici la liste des "
+"identifiants valables : {3}"
 
-#: tiramisu/autolib.py:864
+#: tiramisu/autolib.py:866
 msgid ""
 "the \"{}\" function with positional arguments \"{}\" and keyword arguments "
 "\"{}\" must not return a list (\"{}\") for the follower option {}"
@@ -221,7 +223,7 @@ msgstr ""
 "nommés \"{}\" ne doit pas retourner une liste (\"{}\") pour l'option "
 "suiveuse {}"
 
-#: tiramisu/autolib.py:879
+#: tiramisu/autolib.py:881
 msgid ""
 "the \"{}\" function must not return a list (\"{}\") for the follower option "
 "{}"
@@ -229,7 +231,7 @@ msgstr ""
 "la fonction \"{}\" ne doit pas retourner une liste (\"{}\") pour l'option "
 "suiveuse {}"
 
-#: tiramisu/autolib.py:920
+#: tiramisu/autolib.py:922
 msgid ""
 "unexpected error \"{0}\" in function \"{1}\" with arguments \"{3}\" and "
 "\"{4}\" for option {2}"
@@ -237,7 +239,7 @@ msgstr ""
 "erreur inattendue \"{0}\" dans la fonction \"{1}\" avec les arguments "
 "\"{3}\" et \"{4}\" pour l'option {2}"
 
-#: tiramisu/autolib.py:931
+#: tiramisu/autolib.py:933
 msgid "unexpected error \"{0}\" in function \"{1}\" for option {2}"
 msgstr "erreur inattendue \"{0}\" dans la fonction \"{1}\" pour l'option {2}"
 
@@ -382,14 +384,23 @@ msgstr "ne peut accéder à l'{0} {1} à cause {2} {3}"
 msgid "invalid value"
 msgstr "valeur invalide"
 
-#: tiramisu/error.py:201
+#: tiramisu/error.py:202
 msgid "attention, \"{0}\" could be an invalid {1} for \"{2}\""
 msgstr "attention, \"{0}\" peut être un {1} invalide pour \"{2}\""
 
-#: tiramisu/error.py:219 tiramisu/error.py:228
+#: tiramisu/error.py:204
+msgid "attention, \"{0}\" could be an invalid {1} for \"{2}\" at index \"{3}\""
+msgstr ""
+"attention, \"{0}\" peut être un {1} invalide pour \"{2}\" à l'index \"{3}\""
+
+#: tiramisu/error.py:223 tiramisu/error.py:234
 msgid "\"{0}\" is an invalid {1} for \"{2}\""
 msgstr "\"{0}\" est une valeur invalide pour l'option \"{2}\" de type {1}"
 
+#: tiramisu/error.py:225
+msgid "\"{0}\" is an invalid {1} for \"{2}\" at index \"{3}\""
+msgstr "\"{0}\" est un {1} invalide pour \"{2}\" à l'index \"{3}\""
+
 #: tiramisu/function.py:65
 msgid "network \"{0}\" ({1}) does not match with this netmask"
 msgstr "le réseau \"{0}\" (\"{1}\") ne correspond pas avec le masque de réseau"
@@ -511,27 +522,27 @@ msgstr "seul \"{0}\" est autorisé"
 msgid "only {0} are allowed"
 msgstr "seul {0} sont autorisées"
 
-#: tiramisu/option/domainnameoption.py:60
+#: tiramisu/option/domainnameoption.py:62
 msgid "unknown type {0} for hostname"
 msgstr "type_ inconnu {0} pour le nom d'hôte"
 
-#: tiramisu/option/domainnameoption.py:63
+#: tiramisu/option/domainnameoption.py:65
 msgid "allow_ip must be a boolean"
 msgstr "allow_ip doit être un booléen"
 
-#: tiramisu/option/domainnameoption.py:65
+#: tiramisu/option/domainnameoption.py:67
 msgid "allow_cidr_network must be a boolean"
 msgstr "allow_cidr_network doit être un booléen"
 
-#: tiramisu/option/domainnameoption.py:67
+#: tiramisu/option/domainnameoption.py:69
 msgid "allow_without_dot must be a boolean"
 msgstr "allow_without_dot doit être un booléen"
 
-#: tiramisu/option/domainnameoption.py:69
+#: tiramisu/option/domainnameoption.py:71
 msgid "allow_startswith_dot must be a boolean"
 msgstr "allow_startswith_dot doit être un booléen"
 
-#: tiramisu/option/domainnameoption.py:81
+#: tiramisu/option/domainnameoption.py:82
 msgid ""
 "must start with lowercase characters followed by lowercase characters, "
 "number, \"-\" and \".\" characters are allowed"
@@ -539,7 +550,7 @@ msgstr ""
 "doit démarrer par un caractère en minuscule suivi par des caractères en "
 "minuscule, des nombres, \"-\" et \".\" sont autorisés"
 
-#: tiramisu/option/domainnameoption.py:84
+#: tiramisu/option/domainnameoption.py:85
 msgid ""
 "must start with lowercase characters followed by lowercase characters, "
 "number, \"-\" and \".\" characters are recommanded"
@@ -547,32 +558,56 @@ msgstr ""
 "doit démarrer par un caractère en minuscule suivi par des caractères en "
 "minuscule, des nombres, \"-\" et \".\" sont recommandés"
 
-#: tiramisu/option/domainnameoption.py:88
-#: tiramisu/option/domainnameoption.py:89
+#: tiramisu/option/domainnameoption.py:90
+msgid ""
+"must start with lowercase characters followed by lowercase characters, "
+"number and \"-\" characters are allowed"
+msgstr ""
+"doit démarrer par un caractère en minuscule suivi par des caractères en "
+"minuscule, des nombres et \"-\" sont autorisés"
+
+#: tiramisu/option/domainnameoption.py:93
+msgid ""
+"must start with lowercase characters followed by lowercase characters, "
+"number and \"-\" characters are recommanded"
+msgstr ""
+"doit démarrer par un caractère en minuscule suivi par des caractères en "
+"minuscule, des nombres et\"-\" sont recommandés"
+
+#: tiramisu/option/domainnameoption.py:97
+#: tiramisu/option/domainnameoption.py:98
 msgid "could be a IP, otherwise {}"
 msgstr "peut être une IP, autrement {}"
 
-#: tiramisu/option/domainnameoption.py:134
+#: tiramisu/option/domainnameoption.py:143
 msgid "invalid length (min 1)"
 msgstr "longueur invalide (min 1)"
 
-#: tiramisu/option/domainnameoption.py:137
+#: tiramisu/option/domainnameoption.py:146
 msgid "invalid length (max {0})"
 msgstr "longueur invalide (max {0})"
 
-#: tiramisu/option/domainnameoption.py:143
+#: tiramisu/option/domainnameoption.py:152
 msgid "must have dot"
 msgstr "doit avoir un point"
 
-#: tiramisu/option/domainnameoption.py:145
+#: tiramisu/option/domainnameoption.py:154
 msgid "invalid length (max 255)"
 msgstr "longueur invalide (max 255)"
 
-#: tiramisu/option/domainnameoption.py:163
+#: tiramisu/option/domainnameoption.py:175
+msgid "DNS resolution failed"
+msgstr "la résolution DNS a échoué"
+
+#: tiramisu/option/domainnameoption.py:179
+msgid "error resolving DNS: {1}"
+msgstr "erreur de résolution DNS : {1}"
+
+#: tiramisu/option/domainnameoption.py:186
 msgid "must not be an IP"
 msgstr "ne doit pas être une IP"
 
-#: tiramisu/option/domainnameoption.py:186
+#: tiramisu/option/domainnameoption.py:209
 msgid "some characters are uppercase"
 msgstr "des caractères sont en majuscule"
 
@@ -723,15 +758,15 @@ msgstr "validators doit être une liste de Calculation pour \"{0}\""
 msgid "validators must be a Calculation for \"{0}\""
 msgstr "validators doit être un Calculation pour \"{0}\""
 
-#: tiramisu/option/option.py:146
+#: tiramisu/option/option.py:141
 msgid "invalid default_multi value \"{0}\" for option {1}"
 msgstr "la valeur default_multi est invalide {0} pour l'option {1}"
 
-#: tiramisu/option/option.py:154
+#: tiramisu/option/option.py:149
 msgid "invalid default_multi value \"{0}\" for option {1}, {2}"
 msgstr "la valeur default_multi est invalide \"{0}\" pour l'option {1}, {2}"
 
-#: tiramisu/option/option.py:167
+#: tiramisu/option/option.py:162
 msgid ""
 "invalid default_multi value \"{0}\" for option {1}, must be a list for a "
 "submulti"
@@ -739,19 +774,19 @@ msgstr ""
 "valeur invalide pour default_multi \"{0}\" pour l'option {1}, doit être une "
 "liste pour une submulti"
 
-#: tiramisu/option/option.py:290
+#: tiramisu/option/option.py:285
 msgid "the value \"{}\" is not unique"
 msgstr "la valeur de \"{}\" n'est pas unique"
 
-#: tiramisu/option/option.py:352
+#: tiramisu/option/option.py:347
 msgid "which must not be a list"
 msgstr "qui ne doit pas être une liste"
 
-#: tiramisu/option/option.py:404 tiramisu/option/option.py:430
+#: tiramisu/option/option.py:399 tiramisu/option/option.py:425
 msgid "which must be a list"
 msgstr "qui doit être une liste"
 
-#: tiramisu/option/option.py:424
+#: tiramisu/option/option.py:419
 msgid "which \"{}\" must be a list of list"
 msgstr "lequel \"{}\" doit être une liste de liste"
 
@@ -858,6 +893,10 @@ msgstr "devrait être une nombre entre {0} et {1}"
 msgid "must be between {0} and {1}"
 msgstr "doit être une nombre entre {0} et {1}"
 
+#: tiramisu/option/stroption.py:41
+msgid "which is not a string"
+msgstr "qui n'est pas une chaîne de caractères"
+
 #: tiramisu/option/symlinkoption.py:51
 msgid ""
 "malformed symlink second parameters must be an option for \"{0}\", not {1}"
@@ -869,7 +908,15 @@ msgstr ""
 msgid "must start with http:// or https://"
 msgstr "doit débuter par http:// ou https://"
 
-#: tiramisu/option/urloption.py:119
+#: tiramisu/option/urloption.py:116
+msgid "the port \"{0}\" is invalid: {1}"
+msgstr "le port \"{0}\" est invalide : {1}"
+
+#: tiramisu/option/urloption.py:123
+msgid "the domain \"{0}\" is invalid: {1}"
+msgstr "le domaine \"{0}\" est invalide : {1}"
+
+#: tiramisu/option/urloption.py:127
 msgid "must ends with a valid resource name"
 msgstr "doit finir par un nom de ressource valide"
 
diff --git a/locale/tiramisu.pot b/locale/tiramisu.pot
index c0311fe..bb56be6 100644
--- a/locale/tiramisu.pot
+++ b/locale/tiramisu.pot
@@ -5,7 +5,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2024-12-15 11:06+0100\n"
+"POT-Creation-Date: 2025-02-07 08:01+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -187,23 +187,23 @@ msgstr ""
 msgid "option {0} is not a dynoptiondescription or in a dynoptiondescription"
 msgstr ""
 
-#: tiramisu/autolib.py:685
-msgid "cannot calculate arguments for \"{0}\", cannot find dynamic variable \"{1}\""
+#: tiramisu/autolib.py:687
+msgid "cannot calculate arguments for \"{0}\", cannot find dynamic variable \"{1}\" with identifier \"{2}\", list of valid identifiers: {3}"
 msgstr ""
 
-#: tiramisu/autolib.py:864
+#: tiramisu/autolib.py:866
 msgid "the \"{}\" function with positional arguments \"{}\" and keyword arguments \"{}\" must not return a list (\"{}\") for the follower option {}"
 msgstr ""
 
-#: tiramisu/autolib.py:879
+#: tiramisu/autolib.py:881
 msgid "the \"{}\" function must not return a list (\"{}\") for the follower option {}"
 msgstr ""
 
-#: tiramisu/autolib.py:920
+#: tiramisu/autolib.py:922
 msgid "unexpected error \"{0}\" in function \"{1}\" with arguments \"{3}\" and \"{4}\" for option {2}"
 msgstr ""
 
-#: tiramisu/autolib.py:931
+#: tiramisu/autolib.py:933
 msgid "unexpected error \"{0}\" in function \"{1}\" for option {2}"
 msgstr ""
 
@@ -331,14 +331,22 @@ msgstr ""
 msgid "invalid value"
 msgstr ""
 
-#: tiramisu/error.py:201
+#: tiramisu/error.py:202
 msgid "attention, \"{0}\" could be an invalid {1} for \"{2}\""
 msgstr ""
 
-#: tiramisu/error.py:219 tiramisu/error.py:228
+#: tiramisu/error.py:204
+msgid "attention, \"{0}\" could be an invalid {1} for \"{2}\" at index \"{3}\""
+msgstr ""
+
+#: tiramisu/error.py:223 tiramisu/error.py:234
 msgid "\"{0}\" is an invalid {1} for \"{2}\""
 msgstr ""
 
+#: tiramisu/error.py:225
+msgid "\"{0}\" is an invalid {1} for \"{2}\" at index \"{3}\""
+msgstr ""
+
 #: tiramisu/function.py:65
 msgid "network \"{0}\" ({1}) does not match with this netmask"
 msgstr ""
@@ -443,60 +451,76 @@ msgstr ""
 msgid "only {0} are allowed"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:60
+#: tiramisu/option/domainnameoption.py:62
 msgid "unknown type {0} for hostname"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:63
+#: tiramisu/option/domainnameoption.py:65
 msgid "allow_ip must be a boolean"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:65
+#: tiramisu/option/domainnameoption.py:67
 msgid "allow_cidr_network must be a boolean"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:67
+#: tiramisu/option/domainnameoption.py:69
 msgid "allow_without_dot must be a boolean"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:69
+#: tiramisu/option/domainnameoption.py:71
 msgid "allow_startswith_dot must be a boolean"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:81
+#: tiramisu/option/domainnameoption.py:82
 msgid "must start with lowercase characters followed by lowercase characters, number, \"-\" and \".\" characters are allowed"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:84
+#: tiramisu/option/domainnameoption.py:85
 msgid "must start with lowercase characters followed by lowercase characters, number, \"-\" and \".\" characters are recommanded"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:88
-#: tiramisu/option/domainnameoption.py:89
+#: tiramisu/option/domainnameoption.py:90
+msgid "must start with lowercase characters followed by lowercase characters, number and \"-\" characters are allowed"
+msgstr ""
+
+#: tiramisu/option/domainnameoption.py:93
+msgid "must start with lowercase characters followed by lowercase characters, number and \"-\" characters are recommanded"
+msgstr ""
+
+#: tiramisu/option/domainnameoption.py:97
+#: tiramisu/option/domainnameoption.py:98
 msgid "could be a IP, otherwise {}"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:134
+#: tiramisu/option/domainnameoption.py:143
 msgid "invalid length (min 1)"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:137
+#: tiramisu/option/domainnameoption.py:146
 msgid "invalid length (max {0})"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:143
+#: tiramisu/option/domainnameoption.py:152
 msgid "must have dot"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:145
+#: tiramisu/option/domainnameoption.py:154
 msgid "invalid length (max 255)"
 msgstr ""
 
-#: tiramisu/option/domainnameoption.py:163
-msgid "must not be an IP"
+#: tiramisu/option/domainnameoption.py:175
+msgid "DNS resolution failed"
+msgstr ""
+
+#: tiramisu/option/domainnameoption.py:179
+msgid "error resolving DNS: {1}"
 msgstr ""
 
 #: tiramisu/option/domainnameoption.py:186
+msgid "must not be an IP"
+msgstr ""
+
+#: tiramisu/option/domainnameoption.py:209
 msgid "some characters are uppercase"
 msgstr ""
 
@@ -632,31 +656,31 @@ msgstr ""
 msgid "validators must be a Calculation for \"{0}\""
 msgstr ""
 
-#: tiramisu/option/option.py:146
+#: tiramisu/option/option.py:141
 msgid "invalid default_multi value \"{0}\" for option {1}"
 msgstr ""
 
-#: tiramisu/option/option.py:154
+#: tiramisu/option/option.py:149
 msgid "invalid default_multi value \"{0}\" for option {1}, {2}"
 msgstr ""
 
-#: tiramisu/option/option.py:167
+#: tiramisu/option/option.py:162
 msgid "invalid default_multi value \"{0}\" for option {1}, must be a list for a submulti"
 msgstr ""
 
-#: tiramisu/option/option.py:290
+#: tiramisu/option/option.py:285
 msgid "the value \"{}\" is not unique"
 msgstr ""
 
-#: tiramisu/option/option.py:352
+#: tiramisu/option/option.py:347
 msgid "which must not be a list"
 msgstr ""
 
-#: tiramisu/option/option.py:404 tiramisu/option/option.py:430
+#: tiramisu/option/option.py:399 tiramisu/option/option.py:425
 msgid "which must be a list"
 msgstr ""
 
-#: tiramisu/option/option.py:424
+#: tiramisu/option/option.py:419
 msgid "which \"{}\" must be a list of list"
 msgstr ""
 
@@ -757,6 +781,10 @@ msgstr ""
 msgid "must be between {0} and {1}"
 msgstr ""
 
+#: tiramisu/option/stroption.py:41
+msgid "which is not a string"
+msgstr ""
+
 #: tiramisu/option/symlinkoption.py:51
 msgid "malformed symlink second parameters must be an option for \"{0}\", not {1}"
 msgstr ""
@@ -765,7 +793,15 @@ msgstr ""
 msgid "must start with http:// or https://"
 msgstr ""
 
-#: tiramisu/option/urloption.py:119
+#: tiramisu/option/urloption.py:116
+msgid "the port \"{0}\" is invalid: {1}"
+msgstr ""
+
+#: tiramisu/option/urloption.py:123
+msgid "the domain \"{0}\" is invalid: {1}"
+msgstr ""
+
+#: tiramisu/option/urloption.py:127
 msgid "must ends with a valid resource name"
 msgstr ""
 
diff --git a/tests/test_config_domain.py b/tests/test_config_domain.py
index b329c75..3b2afae 100644
--- a/tests/test_config_domain.py
+++ b/tests/test_config_domain.py
@@ -275,3 +275,9 @@ def test_url(config_type):
         with pytest.raises(ValueError):
             cfg.option('u').value.set('https://FOO.COM:8443')
 #    assert not list_sessions()
+
+
+def test_domainname_existence():
+    DomainnameOption('d', '', 'google.fr', test_existence=True)
+    with pytest.raises(ValueError):
+        DomainnameOption('d', '', 'ljijouuuehyfr.com', test_existence=True)
diff --git a/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo b/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo
index b7017b2..6d44c40 100644
Binary files a/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo and b/tiramisu/locale/fr/LC_MESSAGES/tiramisu.mo differ
diff --git a/tiramisu/option/domainnameoption.py b/tiramisu/option/domainnameoption.py
index 331524d..9d061a1 100644
--- a/tiramisu/option/domainnameoption.py
+++ b/tiramisu/option/domainnameoption.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-# Copyright (C) 2017-2024 Team tiramisu (see AUTHORS for all contributors)
+# Copyright (C) 2017-2025 Team tiramisu (see AUTHORS for all contributors)
 #
 # This program is free software: you can redistribute it and/or modify it
 # under the terms of the GNU Lesser General Public License as published by the
@@ -21,6 +21,7 @@
 """DomainnameOption
 """
 import re
+import socket
 from ipaddress import ip_interface
 from typing import Any, Optional, List
 
@@ -53,6 +54,7 @@ class DomainnameOption(StrOption):
         type: str = "domainname",
         allow_without_dot: bool = False,
         allow_startswith_dot: bool = False,
+        test_existence: bool = False,
         **kwargs,
     ) -> None:
         # pylint: disable=too-many-branches,too-many-locals,too-many-arguments
@@ -68,6 +70,7 @@ class DomainnameOption(StrOption):
         if not isinstance(allow_startswith_dot, bool):
             raise ValueError(_("allow_startswith_dot must be a boolean"))
         extra["_allow_without_dot"] = allow_without_dot
+        extra["_test_existence"] = test_existence
         if type == "domainname":
             if allow_without_dot:
                 min_time = 0
@@ -161,6 +164,20 @@ class DomainnameOption(StrOption):
                 _valid_length(dom)
         else:
             _valid_length(value)
+        self._validate_domain_resolution(value)
+
+    def _validate_domain_resolution(self, value: str) -> None:
+        if not value.startswith(".") and self.impl_get_extra("_test_existence") is True:
+            try:
+                socket.gethostbyname(value)
+            except socket.gaierror as err:
+                raise ValueError(
+                    _("DNS resolution failed").format(value)
+                ) from err
+            except Exception as err:
+                raise ValueError(
+                    _("error resolving DNS: {1}").format(value, err)
+                ) from err
 
     def _validate_ip_network(self, value: str) -> None:
         allow_ip = self.impl_get_extra("_allow_ip")