Apparatus

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sensors Mode-S transponder

A54137

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N438DX · AIRBUS A-330-900 · operated by BANK OF UTAH TRUSTEE

Hex
A54137
Octal
51240467
Decimal
10,830,135
Country
US
Tail
N438DX
Type
A339
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
327
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A54137.

Country allocation

The ICAO 24-bit address A54137 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
DAL165 - 13 2026-07-13
DAL145 Delta Air Lines 12 2026-07-17
DAL4 - 11 2026-07-14
DAL164 Delta Air Lines 11 2026-07-17
DAL20 - 10 2026-07-19
DAL144 - 10 2026-07-13
DAL143 - 10 2026-07-11
DAL57 Delta Air Lines 9 2026-07-21
DAL157 - 9 2026-07-08
DAL9 - 8 2026-07-15
DAL81 - 8 2026-07-18
DAL80 - 8 2026-07-18
DAL272 - 8 2026-07-09
DAL21 Delta Air Lines 8 2026-07-19
DAL59 Delta Air Lines 7 2026-07-26
DAL58 Delta Air Lines 7 2026-07-26
DAL43 Delta Air Lines 7 2026-06-23
DAL299 - 7 2026-06-30
DAL273 - 7 2026-07-09
DAL227 - 7 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL256 BOS → AMS Jul 26, 20:50 UTCJul 26, 21:45 UTC55m
2026-07-26 DAL59 LHR → BOS Jul 26, 09:10 UTCJul 26, 16:00 UTC6h 50m
2026-07-26 DAL58 BOS → LHR Jul 26, 05:30 UTCJul 26, 05:40 UTC10m
2026-07-25 DAL58 BOS → LHR Jul 25, 23:23 UTCJul 26, 05:13 UTC5h 50m
2026-07-25 DAL58 BOS → LHR Jul 25, 23:25 UTCJul 26, 05:40 UTC6h 15m
2026-07-25 DAL63 FCO → ATL Jul 25, 13:55 UTCJul 25, 15:10 UTC1h 15m
2026-07-25 DAL63 FCO → ATL Jul 25, 13:53 UTCJul 25, 20:43 UTC6h 50m
2026-07-25 DAL108 ATL → MAD Jul 25, 02:30 UTCJul 25, 10:45 UTC8h 15m
2026-07-24 DAL223 ATH → ATL Jul 24, 07:05 UTCJul 24, 10:40 UTC3h 35m
2026-07-24 DAL223 ATH → ATL Jul 24, 07:03 UTCJul 24, 18:19 UTC11h 16m
2026-07-23 DAL240 BOS → ATH Jul 23, 19:45 UTCJul 24, 03:55 UTC8h 10m
2026-07-23 DAL59 LHR → BOS Jul 23, 09:15 UTCJul 23, 10:30 UTC1h 15m
2026-07-23 DAL59 LHR → BOS Jul 23, 09:13 UTCJul 23, 15:35 UTC6h 22m
2026-07-23 DAL58 BOS → LHR Jul 23, 00:40 UTCJul 23, 06:50 UTC6h 10m
2026-07-22 DAL257 AMS → BOS Jul 22, 15:15 UTCJul 22, 16:50 UTC1h 35m
2026-07-22 DAL257 AMS → BOS Jul 22, 15:13 UTCJul 22, 22:08 UTC6h 55m
2026-07-22 DAL56 SLC → AMS Jul 22, 03:45 UTCJul 22, 12:50 UTC9h 5m
2026-07-22 DAL56 SLC → AMS Jul 22, 03:44 UTCJul 22, 12:44 UTC9h 0m
2026-07-21 DAL57 AMS → SLC Jul 21, 11:30 UTCJul 21, 21:15 UTC9h 45m
2026-07-21 DAL57 AMS → SLC Jul 21, 11:30 UTCJul 21, 11:45 UTC15m
2026-07-20 DAL142 - Jul 20, 21:15 UTCJul 20, 21:45 UTC30m
2026-07-20 DAL142 SEA → AMS Jul 20, 21:15 UTCJul 21, 06:13 UTC8h 58m
2026-07-19 DAL21 LHR → SEA Jul 19, 18:30 UTCJul 19, 21:05 UTC2h 35m
2026-07-19 DAL21 LHR → SEA Jul 19, 18:26 UTCJul 20, 03:58 UTC9h 32m
2026-07-19 DAL20 - Jul 19, 13:55 UTCJul 19, 14:05 UTC10m
2026-07-19 DAL20 - Jul 19, 05:00 UTCJul 19, 05:45 UTC45m
2026-07-19 DAL20 SEA → LHR Jul 19, 04:59 UTCJul 19, 13:38 UTC8h 39m
2026-07-18 DAL81 - Jul 18, 14:15 UTCJul 19, 00:15 UTC10h 0m
2026-07-18 DAL80 SEA → CDG Jul 18, 02:09 UTCJul 18, 11:20 UTC9h 11m
2026-07-17 DAL145 AMS → SEA Jul 17, 13:33 UTCJul 17, 23:22 UTC9h 49m
2026-07-17 DAL145 AMS → SEA Jul 17, 13:33 UTCJul 17, 23:14 UTC9h 41m
2026-07-17 DAL145 AMS → SEA Jul 17, 13:35 UTCJul 17, 21:44 UTC8h 10m
2026-07-17 DAL164 MSP → AMS Jul 17, 03:05 UTCJul 17, 10:55 UTC7h 50m
2026-07-16 DAL117 - Jul 16, 12:20 UTCJul 16, 13:45 UTC1h 25m
2026-07-16 DAL117 CPH → MSP Jul 16, 12:19 UTCJul 16, 20:31 UTC8h 12m
2026-07-16 DAL116 MSP → CPH Jul 16, 01:46 UTCJul 16, 09:58 UTC8h 12m
2026-07-16 DAL116 MSP → CPH Jul 16, 01:50 UTCJul 16, 10:04 UTC8h 15m
2026-07-15 DAL9 LHR → MSP Jul 15, 11:54 UTCJul 15, 19:46 UTC7h 52m
2026-07-15 DAL3 JFK → LHR Jul 15, 02:55 UTCJul 15, 09:45 UTC6h 50m
2026-07-14 DAL4 - Jul 14, 15:45 UTCJul 14, 16:55 UTC1h 10m
2026-07-14 DAL4 LHR → JFK Jul 14, 15:41 UTCJul 14, 22:40 UTC6h 59m
2026-07-14 DAL4 LHR → JFK Jul 14, 15:41 UTCJul 14, 22:36 UTC6h 55m
2026-07-14 DAL10 MSP → LHR Jul 14, 04:10 UTCJul 14, 11:50 UTC7h 40m
2026-07-13 DAL165 AMS → MSP Jul 13, 13:12 UTCJul 13, 21:22 UTC8h 10m
2026-07-13 DAL165 AMS → MSP Jul 13, 13:12 UTCJul 13, 21:26 UTC8h 14m
2026-07-13 DAL165 - Jul 13, 13:15 UTCJul 13, 14:30 UTC1h 15m
2026-07-13 DAL144 - Jul 13, 00:45 UTCJul 13, 01:45 UTC1h 0m
2026-07-13 DAL144 SEA → AMS Jul 13, 00:45 UTCJul 13, 09:40 UTC8h 55m
2026-07-12 DAL249 BCN → SEA Jul 12, 11:37 UTCJul 12, 22:33 UTC10h 56m
2026-07-12 DAL249 BCN → SEA Jul 12, 11:40 UTCJul 12, 22:35 UTC10h 55m

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 N438DX page for operator, model, and routing details .

Mode-S A54137 frequently asked

What is Mode-S code A54137?
A54137 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N438DX.
Where is Mode-S A54137 registered?
Mode-S code A54137 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 A54137 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54137, octal 51240467, decimal 10,830,135.
What flights does A54137 operate?
Mode-S A54137 has broadcast 20 distinct callsigns, including DAL165, DAL145, DAL4, DAL164, DAL20.