diff --git a/custom_components/mikrotik_router/diagnostics.py b/custom_components/mikrotik_router/diagnostics.py
new file mode 100644
index 0000000..237160e
--- /dev/null
+++ b/custom_components/mikrotik_router/diagnostics.py
@@ -0,0 +1,57 @@
+"""Diagnostics support for Mikrotik Router."""
+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
+
+from .const import DOMAIN
+
+TO_REDACT = {
+    "ip-address",
+    "client-ip-address",
+    "address",
+    "active-address",
+    "mac-address",
+    "active-mac-address",
+    "orig-mac-address",
+    "port-mac-address",
+    "client-mac-address",
+    "client-id",
+    "active-client-id",
+    "eeprom",
+    "sfp-vendor-serial",
+    "gateway",
+    "dns-server",
+    "wins-server",
+    "ntp-server",
+    "caps-manager",
+    "serial-number",
+    "source",
+    "from-addresses",
+    "to-addresses",
+    "src-address",
+    "dst-address",
+    "username",
+    "password",
+    "caller-id",
+    "target",
+    "ssid",
+}
+
+
+async def async_get_config_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry
+) -> dict[str, Any]:
+    """Return diagnostics for a config entry."""
+    controller = hass.data[DOMAIN][config_entry.entry_id]
+    diag: dict[str, Any] = {}
+    diag["entry"]: dict[str, Any] = {}
+
+    diag["entry"]["data"] = async_redact_data(config_entry.data, TO_REDACT)
+    diag["entry"]["options"] = async_redact_data(config_entry.options, TO_REDACT)
+    diag["data"] = async_redact_data(controller.data, TO_REDACT)
+
+    return diag