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 7h ago
Flights observed
117
Distinct callsigns
20
Country
US
Last broadcast
7h 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
DAL69 Delta Air Lines 11 2026-05-12
DAL68 Delta Air Lines 8 2026-05-13
DAL281 Delta Air Lines 8 2026-05-25
DAL197 Delta Air Lines 8 2026-05-21
DAL389 Delta Air Lines 7 2026-05-10
DAL388 Delta Air Lines 7 2026-05-26
DAL275 Delta Air Lines 7 2026-05-26
DAL173 Delta Air Lines 7 2026-05-23
DAL274 Delta Air Lines 6 2026-05-27
DAL196 Delta Air Lines 6 2026-05-24
DAL172 Delta Air Lines 6 2026-05-22
DAL137 Delta Air Lines 5 2026-05-29
DAL136 Delta Air Lines 5 2026-05-29
DAL8 Delta Air Lines 4 2026-04-17
DAL280 Delta Air Lines 4 2026-05-11
DAL167 Delta Air Lines 4 2026-04-17
DAL290 Delta Air Lines 3 2026-04-18
DAL166 Delta Air Lines 3 2026-05-21
DAL7 Delta Air Lines 2 2026-05-20
DAL295 Delta Air Lines 2 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DAL137 AMS → DTW May 29, 13:00 UTCMay 29, 20:25 UTC7h 25m
2026-05-29 DAL136 DTW → AMS May 29, 02:55 UTCMay 29, 10:05 UTC7h 10m
2026-05-29 DAL136 DTW → AMS May 29, 02:50 UTCMay 29, 10:09 UTC7h 19m
2026-05-28 DAL137 AMS → DTW May 28, 13:20 UTCMay 28, 19:15 UTC5h 55m
2026-05-28 DAL137 AMS → DTW May 28, 13:17 UTCMay 28, 20:42 UTC7h 25m
2026-05-28 DAL136 DTW → AMS May 28, 03:20 UTCMay 28, 10:30 UTC7h 10m
2026-05-28 DAL136 DTW → AMS May 28, 03:16 UTCMay 28, 10:37 UTC7h 21m
2026-05-27 DAL274 ATL → CDG May 27, 09:55 UTCMay 27, 21:45 UTC11h 50m
2026-05-26 DAL275 DTW → HND May 26, 18:50 UTCMay 27, 07:15 UTC12h 26m
2026-05-26 DAL388 SFO → JFK May 26, 03:55 UTCMay 26, 16:20 UTC12h 25m
2026-05-26 DAL388 SFO → JFK May 26, 02:53 UTCMay 26, 16:16 UTC13h 23m
2026-05-25 DAL388 SFO → JFK May 25, 09:20 UTCMay 26, 05:10 UTC19h 49m
2026-05-25 DAL281 SEA → PVG May 25, 08:40 UTCMay 26, 05:10 UTC20h 29m
2026-05-25 DAL281 SEA → PVG May 25, 02:10 UTCMay 25, 10:00 UTC7h 50m
2026-05-24 DAL196 ICN → SEA May 24, 10:20 UTCMay 24, 12:05 UTC1h 45m
2026-05-24 DAL196 ICN → SEA May 24, 10:19 UTCMay 24, 19:40 UTC9h 21m
2026-05-23 DAL173 MXP → JFK May 23, 18:18 UTCMay 24, 06:43 UTC12h 25m
2026-05-23 DAL173 MXP → JFK May 23, 18:20 UTCMay 23, 21:15 UTC2h 55m
2026-05-22 DAL172 MNL → JFK May 22, 10:45 UTCMay 22, 20:40 UTC9h 55m
2026-05-21 DAL197 SEA → ICN May 21, 20:15 UTCMay 22, 07:05 UTC10h 50m
2026-05-21 DAL166 HND → SEA May 21, 07:58 UTCMay 21, 15:56 UTC7h 58m
2026-05-21 DAL166 HND → SEA May 21, 08:00 UTCMay 21, 16:01 UTC8h 0m
2026-05-20 DAL7 LAX → HND May 20, 17:45 UTCMay 21, 05:20 UTC11h 35m
2026-05-20 DAL7 LAX → HND May 20, 17:44 UTCMay 21, 05:28 UTC11h 44m
2026-05-20 DAL9755 JFK → ATL May 20, 10:40 UTCMay 20, 15:05 UTC4h 25m
2026-05-19 DAL274 ATL → CDG May 19, 09:50 UTCMay 19, 21:15 UTC11h 25m
2026-05-18 DAL275 DTW → HND May 18, 18:25 UTCMay 19, 06:55 UTC12h 29m
2026-05-18 DAL275 DTW → HND May 18, 18:23 UTCMay 19, 06:59 UTC12h 36m
2026-05-18 DAL388 SFO → JFK May 18, 03:30 UTCMay 18, 15:40 UTC12h 10m
2026-05-17 DAL388 SFO → JFK May 17, 09:20 UTCMay 18, 04:51 UTC19h 31m
2026-05-17 DAL281 SEA → PVG May 17, 08:40 UTCMay 18, 04:51 UTC20h 11m
2026-05-16 DAL281 SEA → PVG May 16, 23:40 UTCMay 17, 10:00 UTC10h 20m
2026-05-16 DAL281 SEA → PVG May 16, 23:36 UTCMay 17, 10:57 UTC11h 21m
2026-05-16 DAL196 ICN → SEA May 16, 10:16 UTCMay 16, 19:30 UTC9h 15m
2026-05-16 DAL196 ICN → SEA May 16, 10:12 UTCMay 16, 19:37 UTC9h 25m
2026-05-15 DAL173 MXP → JFK May 15, 17:25 UTCMay 16, 05:15 UTC11h 50m
2026-05-14 DAL172 MNL → JFK May 14, 10:25 UTCMay 14, 21:10 UTC10h 45m
2026-05-14 DAL197 SEA → ICN May 14, 06:55 UTCMay 14, 07:00 UTC5m
2026-05-13 DAL197 SEA → ICN May 13, 20:30 UTCMay 14, 06:50 UTC10h 20m
2026-05-13 DAL197 SEA → ICN May 13, 20:30 UTCMay 14, 07:02 UTC10h 32m
2026-05-13 DAL68 TPE → SEA May 13, 03:30 UTCMay 13, 12:15 UTC8h 45m
2026-05-13 DAL68 TPE → SEA May 13, 02:05 UTCMay 13, 02:15 UTC10m
2026-05-13 DAL68 TPE → SEA May 13, 02:01 UTCMay 13, 12:13 UTC10h 12m
2026-05-12 DAL69 SEA → TPE May 12, 10:40 UTCMay 12, 11:15 UTC35m
2026-05-12 DAL69 SEA → TPE May 12, 02:45 UTCMay 12, 09:10 UTC6h 25m
2026-05-11 DAL69 SEA → TPE May 11, 23:12 UTCMay 12, 11:09 UTC11h 57m
2026-05-11 DAL280 SIN → ATL May 11, 09:30 UTCMay 11, 19:01 UTC9h 31m
2026-05-10 DAL389 JFK → DEN May 10, 21:35 UTCMay 11, 19:05 UTC21h 31m
2026-05-10 DAL389 JFK → DEN May 10, 17:30 UTCMay 11, 11:50 UTC18h 20m
2026-05-10 DAL389 JFK → DEN May 10, 16:25 UTCMay 11, 11:50 UTC19h 25m

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 7h 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 DAL69, DAL68, DAL281, DAL197, DAL389.