diff --git a/custom_components/localthings/diagnostics.py b/custom_components/localthings/diagnostics.py
index b42f821..b22896b 100644
--- a/custom_components/localthings/diagnostics.py
+++ b/custom_components/localthings/diagnostics.py
@@ -31,9 +31,19 @@ async def async_get_config_entry_diagnostics(
     # detector when called inline here. Offload it to the executor.
     stl_version = await hass.async_add_executor_job(pkg_version, "smartthings-local")
 
+    # /oic/p and /oic/d sit outside the /device/0 batch captured below, so
+    # they'd otherwise never reach an issue report. /oic/d's `rt` is OCF's
+    # standard device-type declaration -- see registry/identity.py.
+    identity = coordinator._identity
     return {
         "device_type": coordinator.device_type_name or "unknown",
         "one_ui_version": coordinator.one_ui_version,
+        "identity": {
+            "manufacturer": identity.manufacturer,
+            "model": identity.model,
+            "device_types": list(identity.device_types),
+            "resources": redact_resources(identity.raw),
+        } if identity is not None else None,
         "unbound_hrefs": sorted(coordinator._unbound_hrefs),
         "resources": redact_resources(coordinator.last_resources),
         "integration_version": integration.version,
diff --git a/custom_components/localthings/registry/identity.py b/custom_components/localthings/registry/identity.py
index 7c16fe9..c5445d1 100644
--- a/custom_components/localthings/registry/identity.py
+++ b/custom_components/localthings/registry/identity.py
@@ -1,7 +1,7 @@
 """Read device identity from standard OCF resources (/oic/p, /oic/d)."""
 from __future__ import annotations
 
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Optional
 
 import cbor2
@@ -13,6 +13,8 @@ class DeviceIdentity:
     model: str
     name: str
     serial: Optional[str]
+    device_types: tuple[str, ...] = ()
+    raw: dict[str, dict] = field(default_factory=dict)
 
 
 def _get(sess, path) -> dict:
@@ -26,6 +28,27 @@ def _get(sess, path) -> dict:
     return {}
 
 
+def _device_types(d: dict) -> tuple[str, ...]:
+    """/oic/d's `rt` -- the device's own OCF device-type declaration.
+
+    In OCF this is the one standardized "what am I" field: alongside the
+    generic 'oic.wk.d' it carries a concrete type such as 'oic.d.airconditioner'
+    or a Samsung 'x.com.samsung.da.*' equivalent. Nothing routes on it yet --
+    device-type detection currently parses board part numbers out of
+    /information/vs/0's modelNum instead (see registry/by_type/__init__.py) --
+    because no captured dump has ever included it: /device/0 batch responses
+    don't carry /oic/d, and diagnostics didn't report it. It's surfaced in
+    diagnostics so incoming issue reports can tell us whether real hardware
+    populates it usefully enough to route on.
+    """
+    rt = d.get('rt')
+    if isinstance(rt, str):
+        rt = [rt]
+    if not isinstance(rt, (list, tuple)):
+        return ()
+    return tuple(t for t in rt if isinstance(t, str))
+
+
 def read_identity(sess, serial: Optional[str]) -> DeviceIdentity:
     p = _get(sess, ['oic', 'p'])
     d = _get(sess, ['oic', 'd'])
@@ -34,4 +57,9 @@ def read_identity(sess, serial: Optional[str]) -> DeviceIdentity:
         model=p.get('mnmo') or '',
         name=d.get('n') or '',
         serial=serial,
+        device_types=_device_types(d),
+        # Kept whole rather than field-by-field: these resources are outside
+        # the /device/0 dump diagnostics already captures, and we don't yet
+        # know which of their fields will turn out to identify a device type.
+        raw={'/oic/p': p, '/oic/d': d},
     )
diff --git a/custom_components/localthings/registry/redact.py b/custom_components/localthings/registry/redact.py
index 9ff6f60..2d4d0f0 100644
--- a/custom_components/localthings/registry/redact.py
+++ b/custom_components/localthings/registry/redact.py
@@ -19,9 +19,18 @@ _SENSITIVE_SUBSTRINGS = (
     'userid', 'deviceid', 'uuid', 'duid', 'password', 'secret',
 )
 
+# Matched whole, not as substrings. OCF's /oic/d and /oic/p identify the unit
+# with bare two-letter keys -- 'di' (device UUID) and 'pi' (platform UUID) --
+# which are as identifying as the serial number above but far too short to
+# match on: 'di' alone is a substring of 'condition', 'display', 'dispenser'
+# and plenty of other perfectly ordinary appliance fields.
+_SENSITIVE_EXACT = frozenset({'di', 'pi'})
+
 
 def _is_sensitive_key(key: str) -> bool:
     lowered = key.lower()
+    if lowered in _SENSITIVE_EXACT:
+        return True
     return any(s in lowered for s in _SENSITIVE_SUBSTRINGS)
 
 
diff --git a/tests/localthings/test_diagnostics.py b/tests/localthings/test_diagnostics.py
index 13fde6b..6385e05 100644
--- a/tests/localthings/test_diagnostics.py
+++ b/tests/localthings/test_diagnostics.py
@@ -38,6 +38,55 @@ async def test_diagnostics_shape_and_redaction(
     assert resources['/status/lock/vs/0']['x.com.samsung.da.ado.devicecontrol'] == 'On'
 
 
+async def test_diagnostics_include_ocf_identity(
+    hass: HomeAssistant, mock_entry, mock_coordinator_session
+) -> None:
+    """/oic/p and /oic/d are outside the /device/0 batch, so diagnostics is
+    the only place an issue report can carry them -- and `rt` there is OCF's
+    own device-type declaration."""
+    from custom_components.localthings.registry.identity import DeviceIdentity
+
+    await hass.config_entries.async_setup(mock_entry.entry_id)
+    await hass.async_block_till_done()
+
+    coordinator = hass.data[DOMAIN][mock_entry.entry_id]
+    coordinator._identity = DeviceIdentity(
+        manufacturer='Samsung Electronics',
+        model='RF9000B',
+        name='Family Hub',
+        serial=None,
+        device_types=('oic.wk.d', 'oic.d.refrigerator'),
+        raw={
+            '/oic/p': {'mnmn': 'Samsung Electronics', 'pi': '12-34-56'},
+            '/oic/d': {'n': 'Family Hub', 'di': 'ab-cd-ef'},
+        },
+    )
+
+    diag = await async_get_config_entry_diagnostics(hass, mock_entry)
+
+    identity = diag['identity']
+    assert identity['model'] == 'RF9000B'
+    assert identity['device_types'] == ['oic.wk.d', 'oic.d.refrigerator']
+    # The raw payloads ride along redacted -- we don't yet know which of
+    # their fields identify a device type, so none are dropped up front.
+    assert identity['resources']['/oic/p']['mnmn'] == 'Samsung Electronics'
+    assert identity['resources']['/oic/d']['di'] == REDACTED
+    assert identity['resources']['/oic/p']['pi'] == REDACTED
+
+
+async def test_diagnostics_identity_none_when_unavailable(
+    hass: HomeAssistant, mock_entry, mock_coordinator_session
+) -> None:
+    """read_identity is best-effort: a device that answers neither resource
+    (or a session that never connected) must not break the download."""
+    await hass.config_entries.async_setup(mock_entry.entry_id)
+    await hass.async_block_till_done()
+
+    diag = await async_get_config_entry_diagnostics(hass, mock_entry)
+
+    assert diag['identity'] is None
+
+
 async def test_diagnostics_include_observe_mode_fields(
     hass: HomeAssistant, mock_entry, mock_coordinator_session
 ) -> None:
diff --git a/tests/test_identity.py b/tests/test_identity.py
index 4d0a138..d9fa4dd 100644
--- a/tests/test_identity.py
+++ b/tests/test_identity.py
@@ -31,3 +31,41 @@ def test_read_identity_tolerates_missing_resources():
     assert ident.manufacturer == 'Samsung'
     assert ident.model == ''
     assert ident.serial is None
+    assert ident.device_types == ()
+    assert ident.raw == {'/oic/p': {}, '/oic/d': {}}
+
+
+def test_read_identity_captures_oic_d_device_types():
+    """/oic/d's `rt` is OCF's own device-type declaration -- captured so
+    diagnostics can show whether real hardware populates it usefully."""
+    sess = FakeSession({
+        ('oic', 'd'): {
+            'n': 'Living Room AC',
+            'rt': ['oic.wk.d', 'oic.d.airconditioner'],
+        },
+    })
+    ident = read_identity(sess, serial=None)
+    assert ident.device_types == ('oic.wk.d', 'oic.d.airconditioner')
+
+
+def test_read_identity_normalizes_scalar_and_malformed_rt():
+    """Firmware that reports a bare string, or a non-list, must not explode."""
+    assert read_identity(
+        FakeSession({('oic', 'd'): {'rt': 'oic.d.refrigerator'}}), None
+    ).device_types == ('oic.d.refrigerator',)
+    assert read_identity(
+        FakeSession({('oic', 'd'): {'rt': 42}}), None
+    ).device_types == ()
+    assert read_identity(
+        FakeSession({('oic', 'd'): {'rt': ['oic.wk.d', 7, None]}}), None
+    ).device_types == ('oic.wk.d',)
+
+
+def test_read_identity_keeps_raw_payloads_for_diagnostics():
+    sess = FakeSession({
+        ('oic', 'p'): {'mnmn': 'Samsung Electronics', 'mnmo': 'RF9000B'},
+        ('oic', 'd'): {'n': 'Family Hub', 'di': 'abc-123'},
+    })
+    ident = read_identity(sess, serial=None)
+    assert ident.raw['/oic/p']['mnmo'] == 'RF9000B'
+    assert ident.raw['/oic/d']['di'] == 'abc-123'
diff --git a/tests/test_redact.py b/tests/test_redact.py
index 21287a0..b80542b 100644
--- a/tests/test_redact.py
+++ b/tests/test_redact.py
@@ -72,3 +72,34 @@ def test_redact_resources_does_not_mutate_input():
     redact_resources(resources)
 
     assert resources['/information/vs/0']['x.com.samsung.da.serialNum'] == original_serial
+
+
+def test_redacts_bare_ocf_identity_keys():
+    """/oic/d and /oic/p identify the unit with two-letter keys ('di', 'pi')
+    that the substring rules can't see."""
+    redacted = redact_resources({
+        '/oic/d': {'di': 'ab-cd-ef', 'n': 'Family Hub'},
+        '/oic/p': {'pi': '12-34-56', 'mnmo': 'RF9000B'},
+    })
+
+    assert redacted['/oic/d']['di'] == REDACTED
+    assert redacted['/oic/p']['pi'] == REDACTED
+    # Non-identifying neighbours in the same payloads survive.
+    assert redacted['/oic/d']['n'] == 'Family Hub'
+    assert redacted['/oic/p']['mnmo'] == 'RF9000B'
+
+
+def test_bare_key_redaction_does_not_leak_into_substring_matching():
+    """'di'/'pi' are whole-key matches only -- plenty of ordinary appliance
+    fields contain those two letters and must survive untouched."""
+    redacted = redact_resources({
+        '/x': {
+            'condition': 'Normal', 'display': 'On', 'dispenser': 'Cubed',
+            'humidity': '45', 'spinSpeed': '1200',
+        },
+    })
+
+    assert redacted['/x'] == {
+        'condition': 'Normal', 'display': 'On', 'dispenser': 'Cubed',
+        'humidity': '45', 'spinSpeed': '1200',
+    }