diff --git a/.coveragerc b/.coveragerc
index f48943388c3..95856947fb6 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -960,6 +960,7 @@ omit =
     homeassistant/components/remote_rpi_gpio/*
     homeassistant/components/rest/notify.py
     homeassistant/components/rest/switch.py
+    homeassistant/components/rfxtrx/diagnostics.py
     homeassistant/components/ridwell/__init__.py
     homeassistant/components/ridwell/sensor.py
     homeassistant/components/ridwell/switch.py
diff --git a/homeassistant/components/rfxtrx/__init__.py b/homeassistant/components/rfxtrx/__init__.py
index d2afda81f9f..ba4cb9eb226 100644
--- a/homeassistant/components/rfxtrx/__init__.py
+++ b/homeassistant/components/rfxtrx/__init__.py
@@ -42,12 +42,11 @@ from .const import (
     CONF_PROTOCOLS,
     DATA_RFXOBJECT,
     DEVICE_PACKET_TYPE_LIGHTING4,
+    DOMAIN,
     EVENT_RFXTRX_EVENT,
     SERVICE_SEND,
 )
 
-DOMAIN = "rfxtrx"
-
 DEFAULT_OFF_DELAY = 2.0
 
 SIGNAL_EVENT = f"{DOMAIN}_event"
diff --git a/homeassistant/components/rfxtrx/const.py b/homeassistant/components/rfxtrx/const.py
index 529289090a6..7a6e333d3db 100644
--- a/homeassistant/components/rfxtrx/const.py
+++ b/homeassistant/components/rfxtrx/const.py
@@ -44,3 +44,5 @@ DEVICE_PACKET_TYPE_LIGHTING4 = 0x13
 EVENT_RFXTRX_EVENT = "rfxtrx_event"
 
 DATA_RFXOBJECT = "rfxobject"
+
+DOMAIN = "rfxtrx"
diff --git a/homeassistant/components/rfxtrx/diagnostics.py b/homeassistant/components/rfxtrx/diagnostics.py
new file mode 100644
index 00000000000..bc2fae2452d
--- /dev/null
+++ b/homeassistant/components/rfxtrx/diagnostics.py
@@ -0,0 +1,19 @@
+"""Diagnostics support for RFXCOM RFXtrx."""
+from __future__ import annotations
+
+from typing import Any
+
+from homeassistant.components.diagnostics import async_redact_data
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+TO_REDACT = {"host"}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    return {
+        "entry": async_redact_data(entry.as_dict(), TO_REDACT),
+    }