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 DAL56 · 37,000 ft
Flights observed
114
Distinct callsigns
20
Country
US
Last broadcast
6h 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
DAL4 Delta Air Lines 9 2026-05-13
DAL58 Delta Air Lines 8 2026-05-24
DAL240 Delta Air Lines 7 2026-05-25
DAL59 Delta Air Lines 6 2026-05-25
DAL226 Delta Air Lines 6 2026-04-15
DAL223 Delta Air Lines 6 2026-05-26
DAL10 Delta Air Lines 6 2026-05-13
DAL3 Delta Air Lines 4 2026-05-14
DAL241 Delta Air Lines 4 2026-05-28
DAL222 Delta Air Lines 4 2026-05-27
DAL9 Delta Air Lines 3 2026-05-14
DAL273 Delta Air Lines 3 2026-04-17
DAL272 Delta Air Lines 3 2026-04-17
DAL257 Delta Air Lines 3 2026-05-22
DAL224 Delta Air Lines 3 2026-05-28
DAL221 Delta Air Lines 3 2026-05-29
DAL17 Delta Air Lines 3 2026-05-23
DAL162 Delta Air Lines 3 2026-05-22
DAL16 Delta Air Lines 3 2026-05-23
DAL157 Delta Air Lines 3 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DAL221 CDG → SLC May 29, 09:25 UTCMay 29, 19:15 UTC9h 50m
2026-05-28 DAL224 SEA → AMS May 28, 23:53 UTCMay 29, 06:26 UTC6h 33m
2026-05-28 DAL224 SEA → AMS May 28, 23:55 UTCMay 29, 06:30 UTC6h 35m
2026-05-28 DAL241 ATH → BOS May 28, 10:40 UTCMay 28, 15:00 UTC4h 20m
2026-05-28 DAL241 ATH → BOS May 28, 10:36 UTCMay 28, 20:05 UTC9h 29m
2026-05-27 DAL222 ATL → ATH May 27, 21:45 UTCMay 28, 08:05 UTC10h 20m
2026-05-26 DAL223 ATH → ATL May 26, 07:10 UTCMay 26, 18:59 UTC11h 50m
2026-05-25 DAL240 BOS → ATH May 25, 19:25 UTCMay 25, 20:40 UTC1h 15m
2026-05-25 DAL240 BOS → ATH May 25, 19:25 UTCMay 26, 04:11 UTC8h 46m
2026-05-25 DAL59 LHR → BOS May 25, 09:00 UTCMay 25, 15:40 UTC6h 40m
2026-05-24 DAL58 BOS → LHR May 24, 23:20 UTCMay 25, 05:40 UTC6h 20m
2026-05-24 DAL58 BOS → LHR May 24, 23:15 UTCMay 25, 05:25 UTC6h 10m
2026-05-24 DAL59 LHR → BOS May 24, 09:00 UTCMay 24, 15:40 UTC6h 40m
2026-05-23 DAL16 DTW → LHR May 23, 22:45 UTCMay 24, 05:40 UTC6h 55m
2026-05-23 DAL17 LHR → DTW May 23, 10:05 UTCMay 23, 17:50 UTC7h 45m
2026-05-22 DAL58 BOS → LHR May 22, 23:24 UTCMay 23, 05:12 UTC5h 48m
2026-05-22 DAL58 BOS → LHR May 22, 23:25 UTCMay 23, 00:45 UTC1h 20m
2026-05-22 DAL257 AMS → BOS May 22, 13:00 UTCMay 22, 14:40 UTC1h 40m
2026-05-22 DAL257 AMS → BOS May 22, 13:00 UTCMay 22, 19:54 UTC6h 54m
2026-05-22 DAL162 MSP → AMS May 22, 01:00 UTCMay 22, 08:30 UTC7h 30m
2026-05-14 DAL9 LHR → ATL May 14, 12:20 UTCMay 14, 20:30 UTC8h 10m
2026-05-14 DAL3 JFK → LHR May 14, 03:50 UTCMay 14, 10:15 UTC6h 25m
2026-05-13 DAL4 LHR → JFK May 13, 17:30 UTCMay 14, 00:50 UTC7h 20m
2026-05-13 DAL4 LHR → JFK May 13, 17:27 UTCMay 14, 00:43 UTC7h 16m
2026-05-13 DAL10 MSP → LHR May 13, 04:40 UTCMay 13, 12:20 UTC7h 40m
2026-05-12 DAL163 AMS → MSP May 12, 10:56 UTCMay 12, 19:22 UTC8h 26m
2026-05-12 DAL163 AMS → MSP May 12, 11:00 UTCMay 12, 13:25 UTC2h 25m
2026-05-11 DAL56 SLC → AMS May 11, 22:35 UTCMay 12, 07:36 UTC9h 1m
2026-05-11 DAL221 CDG → SLC May 11, 09:20 UTCMay 11, 10:55 UTC1h 35m
2026-05-11 DAL221 CDG → SLC May 11, 09:14 UTCMay 11, 19:32 UTC10h 18m
2026-05-10 DAL224 SEA → AMS May 10, 23:19 UTCMay 11, 05:45 UTC6h 25m
2026-05-10 DAL241 ATH → BOS May 10, 10:30 UTCMay 10, 20:09 UTC9h 40m
2026-05-09 DAL222 ATL → ATH May 9, 21:34 UTCMay 10, 00:30 UTC2h 55m
2026-05-09 DAL222 ATL → ATH May 9, 21:32 UTCMay 10, 07:57 UTC10h 25m
2026-05-08 DAL110 EZE → ATL May 8, 23:20 UTCMay 9, 09:15 UTC9h 55m
2026-05-08 DAL110 EZE → ATL May 8, 23:19 UTCMay 9, 09:12 UTC9h 53m
2026-05-08 DAL101 ATL → EZE May 8, 03:49 UTCMay 8, 13:20 UTC9h 30m
2026-05-07 DAL223 ATH → ATL May 7, 07:10 UTCMay 7, 09:00 UTC1h 50m
2026-05-07 DAL223 ATH → ATL May 7, 07:14 UTCMay 7, 19:21 UTC12h 7m
2026-05-07 DAL223 ATH → ATL May 7, 06:45 UTCMay 7, 06:50 UTC5m
2026-05-06 DAL240 BOS → ATH May 6, 19:33 UTCMay 7, 04:22 UTC8h 49m
2026-05-06 DAL240 BOS → ATH May 6, 19:35 UTCMay 7, 01:00 UTC5h 25m
2026-05-06 DAL59 LHR → BOS May 6, 08:55 UTCMay 6, 10:20 UTC1h 25m
2026-05-06 DAL59 LHR → BOS May 6, 08:53 UTCMay 6, 15:37 UTC6h 44m
2026-05-06 DAL59 LHR → BOS May 6, 08:53 UTCMay 6, 15:37 UTC6h 44m
2026-05-05 DAL16 DTW → LHR May 5, 22:50 UTCMay 6, 05:45 UTC6h 55m
2026-05-05 DAL16 DTW → LHR May 5, 22:49 UTCMay 6, 05:34 UTC6h 45m
2026-05-05 DAL17 LHR → DTW May 5, 10:05 UTCMay 5, 11:00 UTC55m
2026-05-05 DAL17 LHR → DTW May 5, 10:04 UTCMay 5, 17:46 UTC7h 42m
2026-05-04 DAL58 BOS → LHR May 4, 23:07 UTCMay 5, 05:14 UTC6h 7m

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 DAL4, DAL58, DAL240, DAL59, DAL226.