Apparatus

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sensors Mode-S transponder

A4C34C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N406DX · AIRBUS A-330-900 · operated by UMB BANK N A TRUSTEE

Hex
A4C34C
Octal
51141514
Decimal
10,797,900
Country
US
Tail
N406DX
Type
A339
Broadcasting now · callsign DAL110 · 38,000 ft
Flights observed
252
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A4C34C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4C34C 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
DAL16 - 17 2026-07-03
DAL17 Delta Air Lines 11 2026-07-01
DAL109 - 11 2026-07-12
DAL4 Delta Air Lines 9 2026-05-13
DAL59 - 8 2026-07-03
DAL58 Delta Air Lines 8 2026-05-24
DAL257 Delta Air Lines 8 2026-06-10
DAL240 Delta Air Lines 7 2026-05-25
DAL62 - 6 2026-07-11
DAL226 Delta Air Lines 6 2026-04-15
DAL223 Delta Air Lines 6 2026-05-26
DAL162 Delta Air Lines 6 2026-06-03
DAL157 Delta Air Lines 6 2026-06-08
DAL143 - 6 2026-07-04
DAL125 - 6 2026-07-11
DAL10 Delta Air Lines 6 2026-05-13
DAL63 - 5 2026-07-10
DAL221 Delta Air Lines 5 2026-06-01
DAL124 - 5 2026-07-11
DAL67 Delta Air Lines 4 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL110 - Jul 13, 23:20 UTCJul 14, 01:10 UTC1h 50m
2026-07-13 DAL110 EZE → ATL Jul 13, 23:20 UTCJul 14, 08:55 UTC9h 35m
2026-07-13 DAL101 ATL → EZE Jul 13, 03:05 UTCJul 13, 12:55 UTC9h 50m
2026-07-12 DAL109 - Jul 12, 08:20 UTCJul 12, 17:01 UTC8h 40m
2026-07-11 DAL62 - Jul 11, 21:55 UTCJul 12, 04:40 UTC6h 45m
2026-07-11 DAL125 LIS → BOS Jul 11, 12:43 UTCJul 11, 19:17 UTC6h 34m
2026-07-11 DAL125 - Jul 11, 12:45 UTCJul 11, 13:30 UTC45m
2026-07-11 DAL124 BOS → LIS Jul 11, 04:30 UTCJul 11, 10:20 UTC5h 50m
2026-07-10 DAL63 - Jul 10, 12:50 UTCJul 10, 20:10 UTC7h 20m
2026-07-10 DAL108 - Jul 10, 01:55 UTCJul 10, 09:00 UTC7h 5m
2026-07-10 DAL108 ATL → MAD Jul 10, 01:54 UTCJul 10, 09:42 UTC7h 48m
2026-07-09 DAL55 - Jul 9, 14:10 UTCJul 9, 15:00 UTC50m
2026-07-09 DAL55 - Jul 9, 05:15 UTCJul 9, 22:40 UTC17h 25m
2026-07-08 DAL55 - Jul 8, 23:05 UTCJul 9, 22:40 UTC23h 35m
2026-07-08 DAL54 - Jul 8, 21:40 UTCJul 8, 23:15 UTC1h 35m
2026-07-08 DAL54 ATL → LOS Jul 8, 21:40 UTCJul 9, 08:54 UTC11h 14m
2026-07-07 DAL109 - Jul 7, 15:25 UTCJul 7, 16:50 UTC1h 25m
2026-07-07 DAL109 MAD → ATL Jul 7, 08:13 UTCJul 7, 16:50 UTC8h 37m
2026-07-07 DAL109 - Jul 7, 08:15 UTCJul 7, 15:20 UTC7h 5m
2026-07-06 DAL62 BOS → MAD Jul 6, 22:13 UTCJul 7, 04:35 UTC6h 22m
2026-07-06 DAL62 BOS → MAD Jul 6, 22:15 UTCJul 7, 04:40 UTC6h 25m
2026-07-05 DAL243 AMS → BOS Jul 5, 12:01 UTCJul 5, 19:22 UTC7h 21m
2026-07-05 DAL243 - Jul 5, 12:05 UTCJul 5, 19:00 UTC6h 55m
2026-07-04 DAL142 SEA → AMS Jul 4, 21:15 UTCJul 5, 06:15 UTC9h 0m
2026-07-04 DAL143 - Jul 4, 08:50 UTCJul 4, 10:20 UTC1h 30m
2026-07-04 DAL143 AMS → SEA Jul 4, 08:47 UTCJul 4, 18:33 UTC9h 46m
2026-07-04 DAL242 BOS → AMS Jul 4, 00:04 UTCJul 4, 06:15 UTC6h 11m
2026-07-04 DAL242 - Jul 4, 00:05 UTCJul 4, 06:10 UTC6h 5m
2026-07-03 DAL59 - Jul 3, 09:15 UTCJul 3, 10:35 UTC1h 20m
2026-07-03 DAL59 LHR → BOS Jul 3, 09:11 UTCJul 3, 16:03 UTC6h 52m
2026-07-03 DAL16 - Jul 3, 00:05 UTCJul 3, 06:45 UTC6h 40m
2026-07-02 DAL133 - Jul 2, 07:40 UTCJul 2, 09:00 UTC1h 20m
2026-07-02 DAL133 AMS → DTW Jul 2, 07:39 UTCJul 2, 15:48 UTC8h 9m
2026-07-01 DAL132 - Jul 1, 20:55 UTCJul 2, 03:50 UTC6h 55m
2026-07-01 DAL17 LHR → DTW Jul 1, 10:00 UTCJul 1, 17:55 UTC7h 55m
2026-06-30 DAL16 - Jun 30, 23:15 UTCJul 1, 01:00 UTC1h 45m
2026-06-30 DAL16 DTW → LHR Jun 30, 23:15 UTCJul 1, 05:58 UTC6h 43m
2026-06-30 DAL17 LHR → DTW Jun 30, 11:05 UTCJun 30, 18:40 UTC7h 35m
2026-06-30 DAL16 - Jun 30, 00:35 UTCJun 30, 07:00 UTC6h 25m
2026-06-30 DAL16 DTW → LHR Jun 30, 00:30 UTCJun 30, 07:11 UTC6h 41m
2026-06-29 DAL17 LHR → DTW Jun 29, 10:29 UTCJun 29, 18:05 UTC7h 35m
2026-06-28 DAL16 - Jun 28, 22:55 UTCJun 29, 05:59 UTC7h 5m
2026-06-28 DAL16 DTW → LHR Jun 28, 22:53 UTCJun 29, 05:48 UTC6h 55m
2026-06-28 DAL17 LHR → DTW Jun 28, 10:10 UTCJun 28, 17:50 UTC7h 40m
2026-06-27 DAL16 - Jun 27, 23:10 UTCJun 28, 06:00 UTC6h 50m
2026-06-27 DAL16 DTW → LHR Jun 27, 23:05 UTCJun 28, 05:54 UTC6h 49m
2026-06-27 DAL17 LHR → DTW Jun 27, 10:10 UTCJun 27, 17:39 UTC7h 30m
2026-06-26 DAL16 - Jun 26, 22:55 UTCJun 27, 04:59 UTC6h 5m
2026-06-26 DAL16 DTW → LHR Jun 26, 22:53 UTCJun 27, 05:48 UTC6h 55m
2026-06-26 DAL17 LHR → DTW Jun 26, 10:05 UTCJun 26, 17:44 UTC7h 40m

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 N406DX page for operator, model, and routing details .

Mode-S A4C34C frequently asked

What is Mode-S code A4C34C?
A4C34C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N406DX.
Where is Mode-S A4C34C registered?
Mode-S code A4C34C 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 A4C34C broadcasting right now?
Yes. Mode-S A4C34C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C34C, octal 51141514, decimal 10,797,900.
What flights does A4C34C operate?
Mode-S A4C34C has broadcast 20 distinct callsigns, including DAL16, DAL17, DAL109, DAL4, DAL59.