Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4DBEF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N412DX · AIRBUS A-330-900 · operated by DELTA AIR LINES INC

Hex
A4DBEF
Octal
51155757
Decimal
10,804,207
Country
US
Tail
N412DX
Type
A339
No current signal · last broadcast 3d ago
Flights observed
267
Distinct callsigns
20
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S A4DBEF.

Country allocation

The ICAO 24-bit address A4DBEF falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
DAL157 Delta Air Lines 12 2026-05-26
DAL272 - 10 2026-06-30
DAL226 - 10 2026-07-07
DAL273 - 9 2026-06-30
DAL137 Delta Air Lines 9 2026-06-24
DAL156 Delta Air Lines 8 2026-05-25
DAL144 - 8 2026-06-21
DAL257 Delta Air Lines 7 2026-06-13
DAL242 - 7 2026-06-18
DAL227 - 7 2026-06-26
DAL136 - 7 2026-06-25
DAL9 - 6 2026-07-08
DAL3 - 6 2026-07-08
DAL145 - 6 2026-07-04
DAL143 - 6 2026-06-19
DAL298 - 5 2026-07-03
DAL237 - 5 2026-06-21
DAL124 - 5 2026-06-14
DAL81 Delta Air Lines 4 2026-06-11
DAL80 Delta Air Lines 4 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 DAL101 ATL → EZE Jul 10, 14:19 UTCJul 10, 23:45 UTC9h 26m
2026-07-10 DAL101 - Jul 10, 14:20 UTCJul 10, 19:55 UTC5h 35m
2026-07-09 DAL75 AMS → ATL Jul 9, 13:46 UTCJul 9, 22:41 UTC8h 55m
2026-07-09 DAL75 AMS → ATL Jul 9, 13:50 UTCJul 9, 22:50 UTC9h 0m
2026-07-09 DAL164 MSP → AMS Jul 9, 03:30 UTCJul 9, 11:00 UTC7h 30m
2026-07-08 DAL9 - Jul 8, 11:45 UTCJul 8, 19:40 UTC7h 55m
2026-07-08 DAL3 JFK → LHR Jul 8, 03:10 UTCJul 8, 09:45 UTC6h 35m
2026-07-07 DAL226 - Jul 7, 06:00 UTCJul 7, 15:30 UTC9h 30m
2026-07-06 DAL227A - Jul 6, 18:50 UTCJul 7, 03:50 UTC9h 0m
2026-07-05 DAL4 - Jul 5, 17:10 UTCJul 5, 18:40 UTC1h 30m
2026-07-05 DAL4 LHR → JFK Jul 5, 17:09 UTCJul 6, 00:24 UTC7h 15m
2026-07-05 DAL20 SEA → LHR Jul 5, 05:10 UTCJul 5, 05:45 UTC35m
2026-07-05 DAL20 SEA → LHR Jul 5, 05:10 UTCJul 5, 13:55 UTC8h 45m
2026-07-04 DAL145 AMS → SEA Jul 4, 14:35 UTCJul 5, 00:25 UTC9h 50m
2026-07-04 DAL145 AMS → SEA Jul 4, 14:34 UTCJul 5, 00:19 UTC9h 45m
2026-07-04 DAL164 - Jul 4, 02:55 UTCJul 4, 10:20 UTC7h 25m
2026-07-03 DAL299 - Jul 3, 13:20 UTCJul 3, 23:35 UTC10h 15m
2026-07-03 DAL298 MSP → FCO Jul 3, 02:06 UTCJul 3, 10:52 UTC8h 46m
2026-07-03 DAL298 - Jul 3, 02:10 UTCJul 3, 04:40 UTC2h 30m
2026-07-02 DAL9 - Jul 2, 11:50 UTCJul 2, 20:20 UTC8h 30m
2026-07-02 DAL9 LHR → MSP Jul 2, 11:46 UTCJul 2, 20:14 UTC8h 28m
2026-07-02 DAL3 JFK → LHR Jul 2, 02:55 UTCJul 2, 09:20 UTC6h 25m
2026-07-01 DAL213 ATH → JFK Jul 1, 12:50 UTCJul 1, 22:50 UTC10h 0m
2026-07-01 DAL212 JFK → ATH Jul 1, 00:55 UTCJul 1, 09:50 UTC8h 55m
2026-06-30 DAL273 LIS → JFK Jun 30, 09:50 UTCJun 30, 16:40 UTC6h 50m
2026-06-30 DAL272 JFK → LIS Jun 30, 01:00 UTCJun 30, 07:20 UTC6h 20m
2026-06-29 DAL185 MXP → JFK Jun 29, 13:19 UTCJun 29, 21:34 UTC8h 15m
2026-06-29 DAL184 JFK → MXP Jun 29, 02:55 UTCJun 29, 10:18 UTC7h 23m
2026-06-29 DAL184 - Jun 29, 02:59 UTCJun 29, 03:44 UTC45m
2026-06-28 DAL185 MXP → JFK Jun 28, 12:59 UTCJun 28, 21:13 UTC8h 14m
2026-06-28 DAL185 MXP → JFK Jun 28, 13:00 UTCJun 28, 13:45 UTC45m
2026-06-28 DAL184 JFK → MXP Jun 28, 02:49 UTCJun 28, 09:58 UTC7h 9m
2026-06-28 DAL184 - Jun 28, 02:49 UTCJun 28, 03:40 UTC50m
2026-06-27 DAL226 - Jun 27, 00:50 UTCJun 27, 07:15 UTC6h 25m
2026-06-27 DAL226 GRU → JFK Jun 27, 00:43 UTCJun 27, 10:13 UTC9h 30m
2026-06-27 DAL226 GRU → JFK Jun 27, 00:43 UTCJun 27, 10:14 UTC9h 31m
2026-06-26 DAL227 - Jun 26, 02:20 UTCJun 26, 11:09 UTC8h 50m
2026-06-25 DAL49 AMS → JFK Jun 25, 13:09 UTCJun 25, 13:45 UTC35m
2026-06-25 DAL49 AMS → JFK Jun 25, 13:08 UTCJun 25, 20:45 UTC7h 37m
2026-06-25 DAL49 AMS → JFK Jun 25, 13:08 UTCJun 25, 20:55 UTC7h 47m
2026-06-25 DAL136 - Jun 25, 02:39 UTCJun 25, 09:40 UTC7h 0m
2026-06-24 DAL137 AMS → DTW Jun 24, 12:54 UTCJun 24, 20:49 UTC7h 55m
2026-06-24 DAL136 - Jun 24, 02:40 UTCJun 24, 09:34 UTC6h 55m
2026-06-23 DAL137 AMS → DTW Jun 23, 12:47 UTCJun 23, 20:55 UTC8h 8m
2026-06-23 DAL137 AMS → DTW Jun 23, 12:49 UTCJun 23, 14:19 UTC1h 30m
2026-06-23 DAL136 - Jun 23, 02:49 UTCJun 23, 09:40 UTC6h 50m
2026-06-23 DAL136 DTW → AMS Jun 23, 02:46 UTCJun 23, 09:40 UTC6h 54m
2026-06-22 DAL137 AMS → DTW Jun 22, 13:44 UTCJun 22, 15:10 UTC1h 25m
2026-06-22 DAL137 AMS → DTW Jun 22, 13:41 UTCJun 22, 21:45 UTC8h 4m
2026-06-22 DAL236 TPA → AMS Jun 22, 01:15 UTCJun 22, 09:24 UTC8h 10m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N412DX page for operator, model, and routing details .

Mode-S A4DBEF frequently asked

What is Mode-S code A4DBEF?
A4DBEF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N412DX.
Where is Mode-S A4DBEF registered?
Mode-S code A4DBEF is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4DBEF broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DBEF, octal 51155757, decimal 10,804,207.
What flights does A4DBEF operate?
Mode-S A4DBEF has broadcast 20 distinct callsigns, including DAL157, DAL272, DAL226, DAL273, DAL137.