Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
290
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A4C34C.

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
DAL109 Delta Air Lines 12 2026-07-17
DAL17 Delta Air Lines 11 2026-07-01
DAL4 Delta Air Lines 9 2026-05-13
DAL257 Delta Air Lines 9 2026-07-23
DAL62 - 8 2026-07-16
DAL59 - 8 2026-07-03
DAL58 Delta Air Lines 8 2026-05-24
DAL242 Delta Air Lines 8 2026-07-25
DAL240 Delta Air Lines 8 2026-07-26
DAL143 Delta Air Lines 8 2026-07-21
DAL243 Delta Air Lines 7 2026-07-26
DAL63 - 6 2026-07-19
DAL241 - 6 2026-07-16
DAL226 Delta Air Lines 6 2026-04-15
DAL223 Delta Air Lines 6 2026-05-26
DAL222 - 6 2026-07-15
DAL162 Delta Air Lines 6 2026-06-03
DAL157 Delta Air Lines 6 2026-06-08
DAL125 - 6 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL240 BOS → ATH Jul 26, 20:00 UTCJul 26, 21:15 UTC1h 15m
2026-07-26 DAL243 TLV → BOS Jul 26, 09:40 UTCJul 26, 16:55 UTC7h 15m
2026-07-25 DAL242 BOS → TLV Jul 25, 23:17 UTCJul 26, 05:25 UTC6h 8m
2026-07-25 DAL242 BOS → TLV Jul 25, 23:20 UTCJul 26, 05:25 UTC6h 5m
2026-07-25 DAL225 CDG → BOS Jul 25, 10:00 UTCJul 25, 11:05 UTC1h 5m
2026-07-25 DAL225 CDG → BOS Jul 25, 09:57 UTCJul 25, 16:51 UTC6h 54m
2026-07-24 DAL220 SLC → CDG Jul 24, 21:55 UTCJul 25, 00:10 UTC2h 15m
2026-07-24 DAL220 SLC → CDG Jul 24, 21:54 UTCJul 25, 06:47 UTC8h 53m
2026-07-24 DAL57 AMS → SLC Jul 24, 09:20 UTCJul 24, 19:15 UTC9h 55m
2026-07-24 DAL242 BOS → TLV Jul 24, 00:05 UTCJul 24, 06:05 UTC6h 0m
2026-07-23 DAL257 AMS → BOS Jul 23, 13:25 UTCJul 23, 20:15 UTC6h 50m
2026-07-23 DAL144 SEA → AMS Jul 23, 01:50 UTCJul 23, 11:00 UTC9h 10m
2026-07-23 DAL144 SEA → AMS Jul 23, 01:47 UTCJul 23, 10:54 UTC9h 7m
2026-07-22 DAL249 TLV → ATL Jul 22, 12:26 UTCJul 22, 23:07 UTC10h 41m
2026-07-22 DAL249 TLV → ATL Jul 22, 12:30 UTCJul 22, 23:05 UTC10h 35m
2026-07-21 DAL248 ATL → TLV Jul 21, 22:50 UTCJul 22, 05:15 UTC6h 25m
2026-07-21 DAL248 ATL → TLV Jul 21, 22:47 UTCJul 22, 08:40 UTC9h 53m
2026-07-21 DAL143 FRA → DTW Jul 21, 08:51 UTCJul 21, 18:34 UTC9h 43m
2026-07-21 DAL143 FRA → DTW Jul 21, 08:55 UTCJul 21, 10:35 UTC1h 40m
2026-07-20 DAL256 BOS → AMS Jul 20, 21:10 UTCJul 21, 03:22 UTC6h 12m
2026-07-20 DAL256 BOS → AMS Jul 20, 21:10 UTCJul 20, 22:20 UTC1h 10m
2026-07-20 DAL243 TLV → BOS Jul 20, 09:45 UTCJul 20, 11:00 UTC1h 15m
2026-07-20 DAL243 TLV → BOS Jul 20, 09:45 UTCJul 20, 16:48 UTC7h 3m
2026-07-19 DAL242 BOS → TLV Jul 19, 23:55 UTCJul 20, 06:15 UTC6h 20m
2026-07-19 DAL63 MAD → BOS Jul 19, 13:10 UTCJul 19, 20:15 UTC7h 5m
2026-07-19 DAL108 - Jul 19, 02:05 UTCJul 19, 04:20 UTC2h 15m
2026-07-19 DAL108 ATL → MAD Jul 19, 02:05 UTCJul 19, 09:59 UTC7h 54m
2026-07-18 DAL215 - Jul 18, 08:55 UTCJul 18, 19:05 UTC10h 10m
2026-07-17 DAL214 ATL → FCO Jul 17, 21:00 UTCJul 18, 06:15 UTC9h 16m
2026-07-17 DAL109 MAD → ATL Jul 17, 08:35 UTCJul 17, 17:09 UTC8h 35m
2026-07-16 DAL62 BOS → MAD Jul 16, 23:44 UTCJul 17, 05:54 UTC6h 10m
2026-07-16 DAL62 - Jul 16, 23:44 UTCJul 17, 06:20 UTC6h 35m
2026-07-16 DAL241 ATH → BOS Jul 16, 10:32 UTCJul 16, 20:16 UTC9h 44m
2026-07-16 DAL241 ATH → BOS Jul 16, 10:35 UTCJul 16, 20:19 UTC9h 45m
2026-07-15 DAL222 ATL → ATH Jul 15, 21:36 UTCJul 16, 07:50 UTC10h 14m
2026-07-15 DAL222 - Jul 15, 21:40 UTCJul 16, 05:00 UTC7h 20m
2026-07-15 DAL215 - Jul 15, 08:05 UTCJul 15, 18:20 UTC10h 15m
2026-07-14 DAL214 ATL → FCO Jul 14, 20:15 UTCJul 15, 05:30 UTC9h 14m
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

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?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
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, DAL109, DAL17, DAL4, DAL257.