BACnet property identifiers

Updated 7 November 2026

Short answer

Every BACnet property has a number. Packet captures, error messages and tools such as Wireshark often show the number. Look any of them up here. Examples: 4 = active-text, 22 = cov-increment, 28 = description.

Looking for a number but not sure which list it belongs to? Use the BACnet number lookup, which searches every table at once.

Property identifiers (485)

Number	Property	Notes
0	acked-transitions Acked_Transitions
1	ack-required Ack_Required
2	action Action
3	action-text Action_Text
4	active-text Active_Text	Text for the active (1) state of a binary object.
5	active-vt-sessions Active_VT_Sessions
6	alarm-value Alarm_Value
7	alarm-values Alarm_Values
8	all All
9	all-writes-successful All_Writes_Successful
10	apdu-segment-timeout APDU_Segment_Timeout
11	apdu-timeout APDU_Timeout
12	application-software-version Application_Software_Version
13	archive Archive
14	bias Bias
15	change-of-state-count Change_Of_State_Count
16	change-of-state-time Change_Of_State_Time
17	notification-class Notification_Class
19	controlled-variable-reference Controlled_Variable_Reference
20	controlled-variable-units Controlled_Variable_Units
21	controlled-variable-value Controlled_Variable_Value
22	cov-increment COV_Increment	How much an analog value must change before a COV notification is sent.
23	date-list Date_List
24	daylight-savings-status Daylight_Savings_Status
25	deadband Deadband
26	derivative-constant Derivative_Constant
27	derivative-constant-units Derivative_Constant_Units
28	description Description	Free-text description of the object.
29	description-of-halt Description_Of_Halt
30	device-address-binding Device_Address_Binding
31	device-type Device_Type
32	effective-period Effective_Period
33	elapsed-active-time Elapsed_Active_Time
34	error-limit Error_Limit
35	event-enable Event_Enable
36	event-state Event_State
37	event-type Event_Type
38	exception-schedule Exception_Schedule
39	fault-values Fault_Values
40	feedback-value Feedback_Value
41	file-access-method File_Access_Method
42	file-size File_Size
43	file-type File_Type
44	firmware-revision Firmware_Revision
45	high-limit High_Limit
46	inactive-text Inactive_Text	Text for the inactive (0) state of a binary object.
47	in-process In_Process
48	instance-of Instance_Of
49	integral-constant Integral_Constant
50	integral-constant-units Integral_Constant_Units
51	issue-confirmed-notifications Issue_Confirmed_Notifications
52	limit-enable Limit_Enable
53	list-of-group-members List_Of_Group_Members
54	list-of-object-property-references List_Of_Object_Property_References
55	list-of-session-keys List_Of_Session_Keys
56	local-date Local_Date
57	local-time Local_Time
58	location Location
59	low-limit Low_Limit
60	manipulated-variable-reference Manipulated_Variable_Reference
61	maximum-output Maximum_Output
62	max-apdu-length-accepted Max_APDU_Length_Accepted
63	max-info-frames Max_Info_Frames
64	max-master Max_Master
65	max-pres-value Max_Pres_Value
66	minimum-off-time Minimum_Off_Time
67	minimum-on-time Minimum_On_Time
68	minimum-output Minimum_Output
69	min-pres-value Min_Pres_Value
70	model-name Model_Name
71	modification-date Modification_Date
72	notify-type Notify_Type
73	number-of-apdu-retries Number_Of_APDU_Retries
74	number-of-states Number_Of_States	How many states a multi-state object has (states are numbered from 1).
75	object-identifier Object_Identifier	Object type plus instance number, packed into one 32-bit value.
76	object-list Object_List	Every object in the device. Reading it is how a scan finds the points.
77	object-name Object_Name	The point name. Unique within a device.
78	object-property-reference Object_Property_Reference
79	object-type Object_Type	Which kind of object this is (AI, BO, MV...).
80	optional Optional
81	out-of-service Out_Of_Service	True disconnects the object from its real input/output; Present_Value can then be written freely.
82	output-units Output_Units
83	event-parameters Event_Parameters
84	polarity Polarity
85	present-value Present_Value	The live value. Commands are written here at a priority (1-16).
86	priority Priority
87	priority-array Priority_Array	16 command slots. The lowest-numbered slot that is not empty wins.
88	priority-for-writing Priority_For_Writing
89	process-identifier Process_Identifier
90	program-change Program_Change
91	program-location Program_Location
92	program-state Program_State
93	proportional-constant Proportional_Constant
94	proportional-constant-units Proportional_Constant_Units
95	protocol-conformance-class Protocol_Conformance_Class (newer)
96	protocol-object-types-supported Protocol_Object_Types_Supported
97	protocol-services-supported Protocol_Services_Supported
98	protocol-version Protocol_Version
99	read-only Read_Only
100	reason-for-halt Reason_For_Halt
101	recipient Recipient (newer)
102	recipient-list Recipient_List
103	reliability Reliability	Why a value may be wrong (no sensor, open loop, communication failure...).
104	relinquish-default Relinquish_Default	The value used when all 16 priority slots are empty.
105	required Required
106	resolution Resolution
107	segmentation-supported Segmentation_Supported
108	setpoint Setpoint
109	setpoint-reference Setpoint_Reference
110	state-text State_Text	The names of a multi-state object's states, starting at state 1.
111	status-flags Status_Flags	Four bits: in-alarm, fault, overridden, out-of-service.
112	system-status System_Status
113	time-delay Time_Delay
114	time-of-active-time-reset Time_Of_Active_Time_Reset
115	time-of-state-count-reset Time_Of_State_Count_Reset
116	time-synchronization-recipients Time_Synchronization_Recipients
117	units Units	Engineering units of an analog value, as a number (see the units table).
118	update-interval Update_Interval
119	utc-offset UTC_Offset
120	vendor-identifier Vendor_Identifier	The manufacturer's ASHRAE vendor ID.
121	vendor-name Vendor_Name	The manufacturer's name as text.
122	vt-classes-supported VT_Classes_Supported
123	weekly-schedule Weekly_Schedule
124	attempted-samples Attempted_Samples
125	average-value Average_Value
126	buffer-size Buffer_Size
127	client-cov-increment Client_COV_Increment
128	cov-resubscription-interval COV_Resubscription_Interval
129	current-notify-time Current_Notify_Time (newer)
130	event-time-stamps Event_Time_Stamps
131	log-buffer Log_Buffer
132	log-device-object-property Log_Device_Object_Property
133	enable Enable
134	log-interval Log_Interval
135	maximum-value Maximum_Value
136	minimum-value Minimum_Value
137	notification-threshold Notification_Threshold
138	previous-notify-time Previous_Notify_Time (newer)
139	protocol-revision Protocol_Revision
140	records-since-notification Records_Since_Notification
141	record-count Record_Count
142	start-time Start_Time
143	stop-time Stop_Time
144	stop-when-full Stop_When_Full
145	total-record-count Total_Record_Count
146	valid-samples Valid_Samples
147	window-interval Window_Interval
148	window-samples Window_Samples
149	maximum-value-timestamp Maximum_Value_Timestamp
150	minimum-value-timestamp Minimum_Value_Timestamp
151	variance-value Variance_Value
152	active-cov-subscriptions Active_COV_Subscriptions
153	backup-failure-timeout Backup_Failure_Timeout
154	configuration-files Configuration_Files
155	database-revision Database_Revision
156	direct-reading Direct_Reading
157	last-restore-time Last_Restore_Time
158	maintenance-required Maintenance_Required
159	member-of Member_Of
160	mode Mode
161	operation-expected Operation_Expected
162	setting Setting
163	silenced Silenced
164	tracking-value Tracking_Value
165	zone-members Zone_Members
166	life-safety-alarm-values Life_Safety_Alarm_Values
167	max-segments-accepted Max_Segments_Accepted
168	profile-name Profile_Name
169	auto-slave-discovery Auto_Slave_Discovery
170	manual-slave-address-binding Manual_Slave_Address_Binding
171	slave-address-binding Slave_Address_Binding
172	slave-proxy-enable Slave_Proxy_Enable
173	last-notify-record Last_Notify_Record
174	schedule-default Schedule_Default
175	accepted-modes Accepted_Modes
176	adjust-value Adjust_Value
177	count Count
178	count-before-change Count_Before_Change
179	count-change-time Count_Change_Time
180	cov-period COV_Period
181	input-reference Input_Reference
182	limit-monitoring-interval Limit_Monitoring_Interval
183	logging-object Logging_Object
184	logging-record Logging_Record
185	prescale Prescale
186	pulse-rate Pulse_Rate
187	scale Scale
188	scale-factor Scale_Factor
189	update-time Update_Time
190	value-before-change Value_Before_Change
191	value-set Value_Set
192	value-change-time Value_Change_Time
193	align-intervals Align_Intervals
195	interval-offset Interval_Offset
196	last-restart-reason Last_Restart_Reason
197	logging-type Logging_Type
202	restart-notification-recipients Restart_Notification_Recipients
203	time-of-device-restart Time_Of_Device_Restart
204	time-synchronization-interval Time_Synchronization_Interval
205	trigger Trigger
206	utc-time-synchronization-recipients UTC_Time_Synchronization_Recipients
207	node-subtype Node_Subtype
208	node-type Node_Type
209	structured-object-list Structured_Object_List
210	subordinate-annotations Subordinate_Annotations
211	subordinate-list Subordinate_List
212	actual-shed-level Actual_Shed_Level
213	duty-window Duty_Window
214	expected-shed-level Expected_Shed_Level
215	full-duty-baseline Full_Duty_Baseline
218	requested-shed-level Requested_Shed_Level
219	shed-duration Shed_Duration
220	shed-level-descriptions Shed_Level_Descriptions
221	shed-levels Shed_Levels
222	state-description State_Description
226	door-alarm-state Door_Alarm_State
227	door-extended-pulse-time Door_Extended_Pulse_Time
228	door-members Door_Members
229	door-open-too-long-time Door_Open_Too_Long_Time
230	door-pulse-time Door_Pulse_Time
231	door-status Door_Status
232	door-unlock-delay-time Door_Unlock_Delay_Time
233	lock-status Lock_Status
234	masked-alarm-values Masked_Alarm_Values
235	secured-status Secured_Status
244	absentee-limit Absentee_Limit
245	access-alarm-events Access_Alarm_Events
246	access-doors Access_Doors
247	access-event Access_Event
248	access-event-authentication-factor Access_Event_Authentication_Factor
249	access-event-credential Access_Event_Credential
250	access-event-time Access_Event_Time
251	access-transaction-events Access_Transaction_Events
252	accompaniment Accompaniment
253	accompaniment-time Accompaniment_Time
254	activation-time Activation_Time
255	active-authentication-policy Active_Authentication_Policy
256	assigned-access-rights Assigned_Access_Rights
257	authentication-factors Authentication_Factors
258	authentication-policy-list Authentication_Policy_List
259	authentication-policy-names Authentication_Policy_Names
260	authentication-status Authentication_Status
261	authorization-mode Authorization_Mode
262	belongs-to Belongs_To
263	credential-disable Credential_Disable
264	credential-status Credential_Status
265	credentials Credentials
266	credentials-in-zone Credentials_In_Zone
267	days-remaining Days_Remaining
268	entry-points Entry_Points
269	exit-points Exit_Points
270	expiration-time Expiration_Time
271	extended-time-enable Extended_Time_Enable
272	failed-attempt-events Failed_Attempt_Events
273	failed-attempts Failed_Attempts
274	failed-attempts-time Failed_Attempts_Time
275	last-access-event Last_Access_Event
276	last-access-point Last_Access_Point
277	last-credential-added Last_Credential_Added
278	last-credential-added-time Last_Credential_Added_Time
279	last-credential-removed Last_Credential_Removed
280	last-credential-removed-time Last_Credential_Removed_Time
281	last-use-time Last_Use_Time
282	lockout Lockout
283	lockout-relinquish-time Lockout_Relinquish_Time
284	master-exemption Master_Exemption
285	max-failed-attempts Max_Failed_Attempts
286	members Members
287	muster-point Muster_Point
288	negative-access-rules Negative_Access_Rules
289	number-of-authentication-policies Number_Of_Authentication_Policies
290	occupancy-count Occupancy_Count
291	occupancy-count-adjust Occupancy_Count_Adjust
292	occupancy-count-enable Occupancy_Count_Enable
293	occupancy-exemption Occupancy_Exemption
294	occupancy-lower-limit Occupancy_Lower_Limit
295	occupancy-lower-limit-enforced Occupancy_Lower_Limit_Enforced
296	occupancy-state Occupancy_State
297	occupancy-upper-limit Occupancy_Upper_Limit
298	occupancy-upper-limit-enforced Occupancy_Upper_Limit_Enforced
299	passback-exemption Passback_Exemption
300	passback-mode Passback_Mode
301	passback-timeout Passback_Timeout
302	positive-access-rules Positive_Access_Rules
303	reason-for-disable Reason_For_Disable
304	supported-formats Supported_Formats
305	supported-format-classes Supported_Format_Classes
306	threat-authority Threat_Authority
307	threat-level Threat_Level
308	trace-flag Trace_Flag
309	transaction-notification-class Transaction_Notification_Class
310	user-external-identifier User_External_Identifier
311	user-information-reference User_Information_Reference
317	user-name User_Name
318	user-type User_Type
319	uses-remaining Uses_Remaining
320	zone-from Zone_From
321	zone-to Zone_To
322	access-event-tag Access_Event_Tag
323	global-identifier Global_Identifier
326	verification-time Verification_Time
327	base-device-security-policy Base_Device_Security_Policy
328	distribution-key-revision Distribution_Key_Revision
329	do-not-hide Do_Not_Hide
330	key-sets Key_Sets
331	last-key-server Last_Key_Server
332	network-access-security-policies Network_Access_Security_Policies
333	packet-reorder-time Packet_Reorder_Time
334	security-pdu-timeout Security_PDU_Timeout
335	security-time-window Security_Time_Window
336	supported-security-algorithm Supported_Security_Algorithm
337	update-key-set-timeout Update_Key_Set_Timeout
338	backup-and-restore-state Backup_And_Restore_State
339	backup-preparation-time Backup_Preparation_Time
340	restore-completion-time Restore_Completion_Time
341	restore-preparation-time Restore_Preparation_Time
342	bit-mask Bit_Mask
343	bit-text Bit_Text
344	is-utc Is_UTC
345	group-members Group_Members
346	group-member-names Group_Member_Names
347	member-status-flags Member_Status_Flags
348	requested-update-interval Requested_Update_Interval
349	covu-period Covu_Period
350	covu-recipients Covu_Recipients
351	event-message-texts Event_Message_Texts
352	event-message-texts-config Event_Message_Texts_Config
353	event-detection-enable Event_Detection_Enable
354	event-algorithm-inhibit Event_Algorithm_Inhibit
355	event-algorithm-inhibit-ref Event_Algorithm_Inhibit_Ref
356	time-delay-normal Time_Delay_Normal
357	reliability-evaluation-inhibit Reliability_Evaluation_Inhibit
358	fault-parameters Fault_Parameters
359	fault-type Fault_Type
360	local-forwarding-only Local_Forwarding_Only
361	process-identifier-filter Process_Identifier_Filter
362	subscribed-recipients Subscribed_Recipients
363	port-filter Port_Filter
364	authorization-exemptions Authorization_Exemptions
365	allow-group-delay-inhibit Allow_Group_Delay_Inhibit
366	channel-number Channel_Number
367	control-groups Control_Groups
368	execution-delay Execution_Delay
369	last-priority Last_Priority
370	write-status Write_Status
371	property-list Property_List
372	serial-number Serial_Number
373	blink-warn-enable Blink_Warn_Enable
374	default-fade-time Default_Fade_Time
375	default-ramp-rate Default_Ramp_Rate
376	default-step-increment Default_Step_Increment
377	egress-time Egress_Time
378	in-progress In_Progress
379	instantaneous-power Instantaneous_Power
380	lighting-command Lighting_Command
381	lighting-command-default-priority Lighting_Command_Default_Priority
382	max-actual-value Max_Actual_Value
383	min-actual-value Min_Actual_Value
384	power Power
385	transition Transition
386	egress-active Egress_Active
387	interface-value Interface_Value
388	fault-high-limit Fault_High_Limit
389	fault-low-limit Fault_Low_Limit
390	low-diff-limit Low_Diff_Limit
391	strike-count Strike_Count
392	time-of-strike-count-reset Time_Of_Strike_Count_Reset
393	default-timeout Default_Timeout
394	initial-timeout Initial_Timeout
395	last-state-change Last_State_Change
396	state-change-values State_Change_Values
397	timer-running Timer_Running
398	timer-state Timer_State
399	apdu-length APDU_Length
400	ip-address IP_Address
401	ip-default-gateway IP_Default_Gateway
402	ip-dhcp-enable IP_DHCP_Enable
403	ip-dhcp-lease-time IP_DHCP_Lease_Time
404	ip-dhcp-lease-time-remaining IP_DHCP_Lease_Time_Remaining
405	ip-dhcp-server IP_DHCP_Server
406	ip-dns-server IP_DNS_Server
407	bacnet-ip-global-address Bacnet_IP_Global_Address
408	bacnet-ip-mode Bacnet_IP_Mode
409	bacnet-ip-multicast-address Bacnet_IP_Multicast_Address
410	bacnet-ip-nat-traversal Bacnet_IP_Nat_Traversal
411	ip-subnet-mask IP_Subnet_Mask
412	bacnet-ip-udp-port Bacnet_IP_UDP_Port
413	bbmd-accept-fd-registrations BBMD_Accept_Fd_Registrations
414	bbmd-broadcast-distribution-table BBMD_Broadcast_Distribution_Table
415	bbmd-foreign-device-table BBMD_Foreign_Device_Table
416	changes-pending Changes_Pending
417	command Command
418	fd-bbmd-address Fd_BBMD_Address
419	fd-subscription-lifetime Fd_Subscription_Lifetime
420	link-speed Link_Speed
421	link-speeds Link_Speeds
422	link-speed-autonegotiate Link_Speed_Autonegotiate
423	mac-address MAC_Address
424	network-interface-name Network_Interface_Name
425	network-number Network_Number
426	network-number-quality Network_Number_Quality
427	network-type Network_Type
428	routing-table Routing_Table
429	virtual-mac-address-table Virtual_MAC_Address_Table
430	command-time-array Command_Time_Array
431	current-command-priority Current_Command_Priority
432	last-command-time Last_Command_Time
433	value-source Value_Source
434	value-source-array Value_Source_Array
435	bacnet-ipv6-mode Bacnet_IPV6_Mode
436	ipv6-address IPV6_Address
437	ipv6-prefix-length IPV6_Prefix_Length
438	bacnet-ipv6-udp-port Bacnet_IPV6_UDP_Port
439	ipv6-default-gateway IPV6_Default_Gateway
440	bacnet-ipv6-multicast-address Bacnet_IPV6_Multicast_Address
441	ipv6-dns-server IPV6_DNS_Server
442	ipv6-auto-addressing-enable IPV6_Auto_Addressing_Enable
443	ipv6-dhcp-lease-time IPV6_DHCP_Lease_Time
444	ipv6-dhcp-lease-time-remaining IPV6_DHCP_Lease_Time_Remaining
445	ipv6-dhcp-server IPV6_DHCP_Server
446	ipv6-zone-index IPV6_Zone_Index
447	assigned-landing-calls Assigned_Landing_Calls
448	car-assigned-direction Car_Assigned_Direction
449	car-door-command Car_Door_Command
450	car-door-status Car_Door_Status
451	car-door-text Car_Door_Text
452	car-door-zone Car_Door_Zone
453	car-drive-status Car_Drive_Status
454	car-load Car_Load
455	car-load-units Car_Load_Units
456	car-mode Car_Mode
457	car-moving-direction Car_Moving_Direction
458	car-position Car_Position
459	elevator-group Elevator_Group
460	energy-meter Energy_Meter
461	energy-meter-ref Energy_Meter_Ref
462	escalator-mode Escalator_Mode
463	fault-signals Fault_Signals
464	floor-text Floor_Text
465	group-id Group_ID
467	group-mode Group_Mode
468	higher-deck Higher_Deck
469	installation-id Installation_ID
470	landing-calls Landing_Calls
471	landing-call-control Landing_Call_Control
472	landing-door-status Landing_Door_Status
473	lower-deck Lower_Deck
474	machine-room-id Machine_Room_ID
475	making-car-call Making_Car_Call
476	next-stopping-floor Next_Stopping_Floor
477	operation-direction Operation_Direction
478	passenger-alarm Passenger_Alarm
479	power-mode Power_Mode
480	registered-car-call Registered_Car_Call
481	active-cov-multiple-subscriptions Active_COV_Multiple_Subscriptions
482	protocol-level Protocol_Level
483	reference-port Reference_Port
484	deployed-profile-location Deployed_Profile_Location
485	profile-location Profile_Location
486	tags Tags
487	subordinate-node-types Subordinate_Node_Types
488	subordinate-tags Subordinate_Tags
489	subordinate-relationships Subordinate_Relationships
490	default-subordinate-relationship Default_Subordinate_Relationship
491	represents Represents
492	default-present-value Default_Present_Value
493	present-stage Present_Stage
494	stages Stages
495	stage-names Stage_Names
496	target-references Target_References
497	audit-source-level Audit_Source_Level
498	audit-level Audit_Level
499	audit-notification-recipient Audit_Notification_Recipient
500	audit-priority-filter Audit_Priority_Filter
501	auditable-operations Auditable_Operations
502	delete-on-forward Delete_On_Forward
503	maximum-send-delay Maximum_Send_Delay
504	monitored-objects Monitored_Objects
505	send-now Send_Now
506	floor-number Floor_Number
507	device-uuid Device_UUID
508	additional-reference-ports Additional_Reference_Ports (newer)
509	certificate-signing-request-file Certificate_Signing_Request_File (newer)
510	command-validation-result Command_Validation_Result (newer)
511	issuer-certificate-files Issuer_Certificate_Files (newer)

Values come from the open-source bacnet-stack 1.6.1 (bacenum.h), which follows ANSI/ASHRAE Standard 135, and were cross-checked one by one against two other independent BACnet stacks (bacpypes and @bacnet-js/client). Entries marked (newer) are in bacnet-stack only, because the other two stacks predate them. Numbers 0-255 (and the higher ASHRAE ranges) are standard; vendors may use proprietary numbers above them.

More BACnet reference

Easy BACnet reads these values straight off the device from an Android phone and shows them as words, not numbers.