diff --git a/homeassistant/components/cert_expiry/sensor.py b/homeassistant/components/cert_expiry/sensor.py
index 56bcf07a3bb..306ac7f9e3d 100644
--- a/homeassistant/components/cert_expiry/sensor.py
+++ b/homeassistant/components/cert_expiry/sensor.py
@@ -14,6 +14,8 @@ from homeassistant.config_entries import SOURCE_IMPORT, ConfigEntry
 from homeassistant.const import CONF_HOST, CONF_PORT, EVENT_HOMEASSISTANT_START
 from homeassistant.core import HomeAssistant, callback
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.device_registry import DeviceEntryType
+from homeassistant.helpers.entity import DeviceInfo
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.event import async_call_later
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
@@ -99,6 +101,11 @@ class SSLCertificateTimestamp(CertExpiryEntity, SensorEntity):
         super().__init__(coordinator)
         self._attr_name = f"Cert Expiry Timestamp ({coordinator.name})"
         self._attr_unique_id = f"{coordinator.host}:{coordinator.port}-timestamp"
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, f"{coordinator.host}:{coordinator.port}")},
+            name=coordinator.name,
+            entry_type=DeviceEntryType.SERVICE,
+        )
 
     @property
     def native_value(self) -> datetime | None: