Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6456D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N503DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC

Hex
A6456D
Octal
51442555
Decimal
10,896,749
Country
US
Tail
N503DN
Type
A359
No current signal · last broadcast 2h ago
Flights observed
223
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A6456D.

Country allocation

The ICAO 24-bit address A6456D 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
DAL281 - 18 2026-07-10
DAL69 - 17 2026-07-07
DAL68 - 16 2026-07-08
DAL389 - 16 2026-07-02
DAL197 - 14 2026-07-08
DAL274 - 13 2026-07-01
DAL275 - 12 2026-06-30
DAL196 - 11 2026-07-09
DAL388 - 10 2026-07-11
DAL96 - 9 2026-07-11
DAL280 - 9 2026-07-03
DAL173 Delta Air Lines 8 2026-06-04
DAL95 Delta Air Lines 7 2026-06-30
DAL172 Delta Air Lines 7 2026-06-03
DAL83 - 6 2026-07-12
DAL71 - 6 2026-06-28
DAL70 - 5 2026-06-27
DAL137 Delta Air Lines 5 2026-05-29
DAL136 Delta Air Lines 5 2026-05-29
DAL82 - 4 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL82 - Jul 13, 21:40 UTCJul 14, 05:15 UTC7h 35m
2026-07-12 DAL1036 MSP → ATL Jul 12, 23:45 UTCJul 13, 01:45 UTC2h 0m
2026-07-12 DAL2825 ATL → MSP Jul 12, 19:52 UTCJul 12, 21:46 UTC1h 54m
2026-07-12 DAL2825 ATL → MSP Jul 12, 19:55 UTCJul 12, 21:55 UTC2h 0m
2026-07-12 DAL83 CDG → ATL Jul 12, 08:05 UTCJul 12, 16:35 UTC8h 30m
2026-07-11 DAL96 - Jul 11, 21:20 UTCJul 12, 04:25 UTC7h 5m
2026-07-11 DAL388 PVG → DTW Jul 11, 02:03 UTCJul 11, 15:34 UTC13h 31m
2026-07-10 DAL281 - Jul 10, 00:10 UTCJul 10, 11:25 UTC11h 15m
2026-07-09 DAL196 - Jul 9, 10:30 UTCJul 9, 12:30 UTC2h 0m
2026-07-09 DAL196 ICN → SEA Jul 9, 10:30 UTCJul 9, 20:11 UTC9h 41m
2026-07-09 DAL196 ICN → SEA Jul 9, 10:30 UTCJul 9, 20:08 UTC9h 38m
2026-07-08 DAL197 - Jul 8, 20:50 UTCJul 9, 00:25 UTC3h 35m
2026-07-08 DAL197 SEA → ICN Jul 8, 20:50 UTCJul 9, 08:05 UTC11h 15m
2026-07-08 DAL68 - Jul 8, 02:05 UTCJul 8, 02:25 UTC20m
2026-07-08 DAL68 TPE → SEA Jul 8, 02:04 UTCJul 8, 12:48 UTC10h 44m
2026-07-08 DAL68 TPE → SEA Jul 8, 02:04 UTCJul 8, 12:38 UTC10h 34m
2026-07-07 DAL69 - Jul 7, 11:00 UTCJul 7, 11:25 UTC25m
2026-07-07 DAL69 - Jul 7, 00:05 UTCJul 7, 09:50 UTC9h 45m
2026-07-06 DAL196 - Jul 6, 10:10 UTCJul 6, 19:35 UTC9h 25m
2026-07-05 DAL197 SEA → ICN Jul 5, 20:15 UTCJul 6, 06:55 UTC10h 40m
2026-07-05 DAL197 SEA → ICN Jul 5, 20:13 UTCJul 6, 06:56 UTC10h 43m
2026-07-05 DAL68 - Jul 5, 03:15 UTCJul 5, 12:10 UTC8h 55m
2026-07-05 DAL68 - Jul 5, 01:45 UTCJul 5, 02:00 UTC15m
2026-07-04 DAL69 - Jul 4, 01:35 UTCJul 4, 02:20 UTC45m
2026-07-04 DAL69 SEA → TPE Jul 4, 01:32 UTCJul 4, 14:25 UTC12h 53m
2026-07-03 DAL280 - Jul 3, 04:20 UTCJul 3, 21:25 UTC17h 5m
2026-07-02 DAL389 - Jul 2, 22:00 UTCJul 3, 21:15 UTC23h 15m
2026-07-02 DAL389 - Jul 2, 17:20 UTCJul 3, 13:50 UTC20h 30m
2026-07-02 DAL389 - Jul 2, 16:50 UTCJul 3, 13:50 UTC21h 0m
2026-07-01 DAL274 HND → DTW Jul 1, 09:53 UTCJul 1, 21:07 UTC11h 14m
2026-07-01 DAL274 HND → DTW Jul 1, 09:53 UTCJul 1, 21:01 UTC11h 8m
2026-07-01 DAL274 - Jul 1, 09:55 UTCJul 1, 10:35 UTC40m
2026-06-30 DAL275 - Jun 30, 18:05 UTCJul 1, 06:15 UTC12h 10m
2026-06-30 DAL275 DTW → HND Jun 30, 18:01 UTCJul 1, 06:11 UTC12h 10m
2026-06-30 DAL95 DTW → CDG Jun 30, 07:50 UTCJun 30, 15:35 UTC7h 45m
2026-06-29 DAL82 ATL → CDG Jun 29, 20:00 UTCJun 30, 03:30 UTC7h 31m
2026-06-28 DAL71 AMS → ATL Jun 28, 07:34 UTCJun 28, 16:05 UTC8h 30m
2026-06-27 DAL70 - Jun 27, 21:10 UTCJun 28, 04:35 UTC7h 25m
2026-06-27 DAL83 - Jun 27, 09:50 UTCJun 27, 11:25 UTC1h 35m
2026-06-27 DAL83 CDG → ATL Jun 27, 09:47 UTCJun 27, 18:21 UTC8h 34m
2026-06-26 DAL96 NRT → GUM Jun 26, 23:39 UTCJun 27, 05:15 UTC5h 35m
2026-06-26 DAL96 NRT → GUM Jun 26, 23:38 UTCJun 27, 06:38 UTC7h 0m
2026-06-26 DAL274 - Jun 26, 09:59 UTCJun 26, 21:10 UTC11h 10m
2026-06-26 DAL274 HND → DTW Jun 26, 09:58 UTCJun 26, 21:10 UTC11h 12m
2026-06-25 DAL275 - Jun 25, 18:24 UTCJun 26, 06:50 UTC12h 25m
2026-06-25 DAL95 DTW → CDG Jun 25, 07:49 UTCJun 25, 15:54 UTC8h 5m
2026-06-24 DAL82 ATL → CDG Jun 24, 20:40 UTCJun 25, 04:20 UTC7h 40m
2026-06-24 DAL71 AMS → ATL Jun 24, 07:48 UTCJun 24, 16:34 UTC8h 46m
2026-06-24 DAL71 - Jun 24, 07:50 UTCJun 24, 09:19 UTC1h 30m
2026-06-23 DAL70 - Jun 23, 19:59 UTCJun 24, 03:29 UTC7h 30m

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 N503DN page for operator, model, and routing details .

Mode-S A6456D frequently asked

What is Mode-S code A6456D?
A6456D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N503DN.
Where is Mode-S A6456D registered?
Mode-S code A6456D 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 A6456D broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6456D, octal 51442555, decimal 10,896,749.
What flights does A6456D operate?
Mode-S A6456D has broadcast 20 distinct callsigns, including DAL281, DAL69, DAL68, DAL389, DAL197.