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 Jul 26, 22:00 UTC
Flights observed
315
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

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 - 14 2026-07-19
DAL9 - 10 2026-07-16
DAL4 - 10 2026-07-11
DAL215 - 9 2026-07-05
DAL165 - 9 2026-07-10
DAL164 Delta Air Lines 9 2026-07-18
DAL145 Delta Air Lines 9 2026-07-18
DAL80 - 8 2026-07-19
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
DAL3 - 7 2026-07-16
DAL256 Delta Air Lines 7 2026-07-25
DAL225 Delta Air Lines 7 2026-07-23
DAL223 - 7 2026-07-03
DAL67 Delta Air Lines 6 2026-05-21
DAL66 - 6 2026-07-07
DAL63 Delta Air Lines 6 2026-06-28
DAL226 - 6 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL42 SYD → LAX Jul 26, 21:30 UTCJul 26, 22:00 UTC30m
2026-07-26 DAL143 FRA → DTW Jul 26, 08:55 UTCJul 26, 18:20 UTC9h 25m
2026-07-25 DAL256 BOS → AMS Jul 25, 20:55 UTCJul 26, 02:55 UTC6h 0m
2026-07-25 DAL59 LHR → BOS Jul 25, 09:05 UTCJul 25, 10:20 UTC1h 15m
2026-07-25 DAL59 LHR → BOS Jul 25, 09:00 UTCJul 25, 15:37 UTC6h 37m
2026-07-24 DAL16 DTW → LHR Jul 24, 23:05 UTCJul 25, 05:45 UTC6h 40m
2026-07-24 DAL16 DTW → LHR Jul 24, 23:00 UTCJul 25, 05:41 UTC6h 41m
2026-07-24 DAL135 AMS → DTW Jul 24, 09:25 UTCJul 24, 17:25 UTC8h 0m
2026-07-24 DAL135 AMS → DTW Jul 24, 09:21 UTCJul 24, 17:22 UTC8h 1m
2026-07-23 DAL256 BOS → AMS Jul 23, 22:15 UTCJul 24, 04:10 UTC5h 55m
2026-07-23 DAL225 CDG → BOS Jul 23, 17:10 UTCJul 23, 17:15 UTC5m
2026-07-23 DAL225 CDG → BOS Jul 23, 10:10 UTCJul 23, 17:15 UTC7h 5m
2026-07-23 DAL225 CDG → BOS Jul 23, 10:08 UTCJul 23, 16:55 UTC6h 47m
2026-07-22 DAL220 - Jul 22, 21:50 UTCJul 23, 00:10 UTC2h 20m
2026-07-22 DAL220 SLC → CDG Jul 22, 21:45 UTCJul 23, 07:22 UTC9h 37m
2026-07-22 DAL57 AMS → SLC Jul 22, 09:15 UTCJul 22, 19:00 UTC9h 45m
2026-07-21 DAL142 - Jul 21, 21:30 UTCJul 22, 17:45 UTC20h 15m
2026-07-20 DAL21 LHR → SEA Jul 20, 17:15 UTCJul 21, 02:55 UTC9h 39m
2026-07-20 DAL21 LHR → SEA Jul 20, 17:13 UTCJul 21, 02:53 UTC9h 40m
2026-07-20 DAL20 SEA → LHR Jul 20, 05:15 UTCJul 20, 14:10 UTC8h 55m
2026-07-19 DAL81 - Jul 19, 14:25 UTCJul 19, 21:10 UTC6h 45m
2026-07-19 DAL81 CDG → SEA Jul 19, 14:23 UTCJul 20, 00:23 UTC10h 0m
2026-07-19 DAL80 SEA → CDG Jul 19, 02:00 UTCJul 19, 11:15 UTC9h 15m
2026-07-19 DAL80 SEA → CDG Jul 19, 01:59 UTCJul 19, 11:11 UTC9h 12m
2026-07-18 DAL145 AMS → SEA Jul 18, 13:34 UTCJul 18, 23:23 UTC9h 49m
2026-07-18 DAL145 AMS → SEA Jul 18, 13:35 UTCJul 18, 23:25 UTC9h 50m
2026-07-18 DAL164 MSP → AMS Jul 18, 03:05 UTCJul 18, 10:47 UTC7h 42m
2026-07-18 DAL164 MSP → AMS Jul 18, 03:05 UTCJul 18, 05:55 UTC2h 50m
2026-07-17 DAL299 - Jul 17, 13:25 UTCJul 17, 23:25 UTC10h 0m
2026-07-17 DAL299 FCO → MSP Jul 17, 13:24 UTCJul 17, 23:20 UTC9h 56m
2026-07-17 DAL298 JFK → LOS Jul 17, 01:59 UTCJul 17, 11:04 UTC9h 5m
2026-07-16 DAL9 - Jul 16, 11:45 UTCJul 16, 19:25 UTC7h 40m
2026-07-16 DAL9 LHR → MSP Jul 16, 11:41 UTCJul 16, 19:19 UTC7h 38m
2026-07-16 DAL3 JFK → LHR Jul 16, 02:35 UTCJul 16, 09:05 UTC6h 30m
2026-07-15 DAL213 ATH → JFK Jul 15, 13:00 UTCJul 15, 23:10 UTC10h 10m
2026-07-15 DAL212 JFK → ATH Jul 15, 01:00 UTCJul 15, 10:00 UTC9h 0m
2026-07-14 DAL157 ACC → JFK Jul 14, 09:29 UTCJul 14, 19:34 UTC10h 5m
2026-07-13 DAL156 - Jul 13, 21:20 UTCJul 14, 12:00 UTC14h 40m
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

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 Jul 26, 22:00 UTC.
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, DAL9, DAL4, DAL215, DAL165.