Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A53D80

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N437DX · AIRBUS A-330-900 · operated by DELTA AIR LINES INC

Hex
A53D80
Octal
51236600
Decimal
10,829,184
Country
US
Tail
N437DX
Type
A339
No current signal · last broadcast 4h ago
Flights observed
278
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A53D80.

Country allocation

The ICAO 24-bit address A53D80 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
DAL81 Delta Air Lines 12 2026-06-20
DAL4 - 10 2026-07-11
DAL215 - 9 2026-07-05
DAL165 - 9 2026-07-10
DAL9 Delta Air Lines 8 2026-06-10
DAL742 Delta Air Lines 8 2026-06-09
DAL214 Delta Air Lines 8 2026-07-04
DAL10 - 8 2026-07-11
DAL951 Delta Air Lines 7 2026-05-05
DAL223 - 7 2026-07-03
DAL164 - 7 2026-06-19
DAL145 - 7 2026-06-19
DAL80 - 6 2026-06-20
DAL67 Delta Air Lines 6 2026-05-21
DAL66 - 6 2026-07-07
DAL63 Delta Air Lines 6 2026-06-28
DAL3 Delta Air Lines 6 2026-06-10
DAL226 - 6 2026-07-12
DAL71 Delta Air Lines 5 2026-05-27
DAL256 Delta Air Lines 5 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL156 - Jul 13, 21:20 UTCJul 14, 04:40 UTC7h 20m
2026-07-12 DAL226 - Jul 12, 23:50 UTCJul 13, 09:15 UTC9h 25m
2026-07-12 DAL226 GRU → JFK Jul 12, 23:47 UTCJul 13, 09:13 UTC9h 26m
2026-07-12 DAL227 - Jul 12, 03:10 UTCJul 12, 12:20 UTC9h 10m
2026-07-11 DAL4 LHR → JFK Jul 11, 15:50 UTCJul 11, 23:10 UTC7h 20m
2026-07-11 DAL4 LHR → JFK Jul 11, 15:49 UTCJul 11, 23:08 UTC7h 19m
2026-07-11 DAL10 MSP → LHR Jul 11, 04:15 UTCJul 11, 11:55 UTC7h 40m
2026-07-10 DAL165 - Jul 10, 13:10 UTCJul 10, 21:25 UTC8h 15m
2026-07-10 DAL136 - Jul 10, 02:50 UTCJul 10, 04:40 UTC1h 50m
2026-07-10 DAL136 DTW → AMS Jul 10, 02:46 UTCJul 10, 09:45 UTC6h 59m
2026-07-09 DAL137 AMS → DTW Jul 9, 12:55 UTCJul 9, 21:10 UTC8h 15m
2026-07-09 DAL236 - Jul 9, 01:55 UTCJul 9, 05:25 UTC3h 30m
2026-07-09 DAL236 TPA → AMS Jul 9, 01:51 UTCJul 9, 10:25 UTC8h 34m
2026-07-08 DAL237 - Jul 8, 14:10 UTCJul 8, 15:50 UTC1h 40m
2026-07-08 DAL237 AMS → TPA Jul 8, 14:07 UTCJul 8, 23:16 UTC9h 9m
2026-07-08 DAL144 - Jul 8, 02:20 UTCJul 8, 05:40 UTC3h 20m
2026-07-08 DAL144 SEA → AMS Jul 8, 02:18 UTCJul 8, 11:17 UTC8h 59m
2026-07-07 DAL43 - Jul 7, 12:35 UTCJul 7, 23:55 UTC11h 20m
2026-07-07 DAL66 ATL → FCO Jul 7, 00:25 UTCJul 7, 09:45 UTC9h 20m
2026-07-06 DAL297 SPN → NRT Jul 6, 09:50 UTCJul 6, 21:25 UTC11h 35m
2026-07-05 DAL296 HND → ATL Jul 5, 20:55 UTCJul 6, 06:55 UTC10h 0m
2026-07-05 DAL215 - Jul 5, 08:20 UTCJul 5, 18:15 UTC9h 55m
2026-07-04 DAL214 ATL → FCO Jul 4, 20:30 UTCJul 4, 23:30 UTC3h 0m
2026-07-04 DAL214 ATL → FCO Jul 4, 20:27 UTCJul 5, 05:26 UTC8h 59m
2026-07-03 DAL223 - Jul 3, 20:30 UTCJul 3, 21:05 UTC35m
2026-07-03 DAL223 - Jul 3, 07:00 UTCJul 3, 18:50 UTC11h 50m
2026-07-03 DAL223 ATH → SAV Jul 3, 06:58 UTCJul 3, 18:27 UTC11h 29m
2026-07-02 DAL240 BOS → ATH Jul 2, 19:50 UTCJul 3, 04:15 UTC8h 25m
2026-07-02 DAL243 AMS → BOS Jul 2, 09:40 UTCJul 2, 17:05 UTC7h 25m
2026-07-01 DAL242 BOS → AMS Jul 1, 23:30 UTCJul 2, 05:45 UTC6h 15m
2026-07-01 DAL257 AMS → BOS Jul 1, 13:22 UTCJul 1, 20:45 UTC7h 23m
2026-07-01 DAL257 - Jul 1, 13:25 UTCJul 1, 14:00 UTC35m
2026-07-01 DAL144 SEA → AMS Jul 1, 01:00 UTCJul 1, 10:20 UTC9h 20m
2026-06-30 DAL43 LAX → SYD Jun 30, 11:05 UTCJun 30, 15:25 UTC4h 20m
2026-06-30 DAL43 LAX → SYD Jun 30, 11:01 UTCJun 30, 22:05 UTC11h 4m
2026-06-30 DAL43 LAX → SYD Jun 30, 11:01 UTCJun 30, 22:09 UTC11h 8m
2026-06-29 DAL42 SYD → LAX Jun 29, 21:27 UTCJun 30, 08:17 UTC10h 50m
2026-06-29 DAL42 SYD → LAX Jun 29, 21:30 UTCJun 30, 08:15 UTC10h 46m
2026-06-29 DAL143 AMS → SEA Jun 29, 09:05 UTCJun 29, 18:14 UTC9h 10m
2026-06-28 DAL242 - Jun 28, 23:25 UTCJun 29, 05:30 UTC6h 5m
2026-06-28 DAL63 FCO → ATL Jun 28, 12:55 UTCJun 28, 20:29 UTC7h 35m
2026-06-28 DAL63 FCO → ATL Jun 28, 12:51 UTCJun 28, 20:25 UTC7h 34m
2026-06-28 DAL108 - Jun 28, 02:05 UTCJun 28, 09:45 UTC7h 40m
2026-06-27 DAL215 - Jun 27, 08:20 UTCJun 27, 11:20 UTC3h 0m
2026-06-27 DAL215 FCO → ATL Jun 27, 08:18 UTCJun 27, 18:26 UTC10h 8m
2026-06-26 DAL214 ATL → FCO Jun 26, 20:00 UTCJun 27, 04:44 UTC8h 45m
2026-06-26 DAL109 MAD → ATL Jun 26, 08:05 UTCJun 26, 16:49 UTC8h 45m
2026-06-25 DAL62 ATL → FCO Jun 25, 23:05 UTCJun 26, 05:19 UTC6h 15m
2026-06-25 DAL125 LIS → BOS Jun 25, 12:11 UTCJun 25, 19:07 UTC6h 56m
2026-06-25 DAL125 LIS → BOS Jun 25, 12:15 UTCJun 25, 19:05 UTC6h 50m

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 N437DX page for operator, model, and routing details .

Mode-S A53D80 frequently asked

What is Mode-S code A53D80?
A53D80 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N437DX.
Where is Mode-S A53D80 registered?
Mode-S code A53D80 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 A53D80 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53D80, octal 51236600, decimal 10,829,184.
What flights does A53D80 operate?
Mode-S A53D80 has broadcast 20 distinct callsigns, including DAL81, DAL4, DAL215, DAL165, DAL9.