diff --git a/homeassistant/components/whois/sensor.py b/homeassistant/components/whois/sensor.py
index 0459651e693..6df920f385c 100644
--- a/homeassistant/components/whois/sensor.py
+++ b/homeassistant/components/whois/sensor.py
@@ -80,13 +80,6 @@ def _ensure_timezone(timestamp: datetime | None) -> datetime | None:
     return timestamp
 
 
-def _fetch_attr_if_exists(domain: Domain, attr: str) -> str | None:
-    """Fetch an attribute if it exists and is truthy or return None."""
-    if hasattr(domain, attr) and (value := getattr(domain, attr)):
-        return cast(str, value)
-    return None
-
-
 SENSORS: tuple[WhoisSensorEntityDescription, ...] = (
     WhoisSensorEntityDescription(
         key="admin",
@@ -94,7 +87,7 @@ SENSORS: tuple[WhoisSensorEntityDescription, ...] = (
         icon="mdi:account-star",
         entity_category=EntityCategory.DIAGNOSTIC,
         entity_registry_enabled_default=False,
-        value_fn=lambda domain: _fetch_attr_if_exists(domain, "admin"),
+        value_fn=lambda domain: getattr(domain, "admin", None),
     ),
     WhoisSensorEntityDescription(
         key="creation_date",
@@ -130,7 +123,7 @@ SENSORS: tuple[WhoisSensorEntityDescription, ...] = (
         icon="mdi:account",
         entity_category=EntityCategory.DIAGNOSTIC,
         entity_registry_enabled_default=False,
-        value_fn=lambda domain: _fetch_attr_if_exists(domain, "owner"),
+        value_fn=lambda domain: getattr(domain, "owner", None),
     ),
     WhoisSensorEntityDescription(
         key="registrant",
@@ -138,7 +131,7 @@ SENSORS: tuple[WhoisSensorEntityDescription, ...] = (
         icon="mdi:account-edit",
         entity_category=EntityCategory.DIAGNOSTIC,
         entity_registry_enabled_default=False,
-        value_fn=lambda domain: _fetch_attr_if_exists(domain, "registrant"),
+        value_fn=lambda domain: getattr(domain, "registrant", None),
     ),
     WhoisSensorEntityDescription(
         key="registrar",
@@ -154,7 +147,7 @@ SENSORS: tuple[WhoisSensorEntityDescription, ...] = (
         icon="mdi:store",
         entity_category=EntityCategory.DIAGNOSTIC,
         entity_registry_enabled_default=False,
-        value_fn=lambda domain: _fetch_attr_if_exists(domain, "reseller"),
+        value_fn=lambda domain: getattr(domain, "reseller", None),
     ),
 )