Apparatus

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sensors Mode-S transponder

A38C66

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N328DU · operated by DELTA AIR LINES INC

Hex
A38C66
Octal
50706146
Decimal
10,718,310
Country
US
Tail
N328DU
Type
BCS3
No current signal · last broadcast 2h ago
Flights observed
376
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A38C66.

Country allocation

The ICAO 24-bit address A38C66 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
DAL750 Delta Air Lines 17 2026-05-03
DAL2508 Delta Air Lines 17 2026-05-04
DAL2408 - 14 2026-07-10
DAL2442 Delta Air Lines 13 2026-05-11
DAL2186 - 13 2026-07-10
DAL816 - 11 2026-07-07
DAL922 Delta Air Lines 10 2026-05-09
DAL1297 - 10 2026-07-09
DAL483 - 9 2026-07-13
DAL2768 - 9 2026-07-10
DAL1358 - 8 2026-07-12
DAL928 - 7 2026-06-27
DAL541 - 7 2026-07-12
DAL2572 Delta Air Lines 7 2026-05-05
DAL1677 - 7 2026-07-08
DAL2646 - 6 2026-06-14
DAL2543 - 6 2026-07-10
DAL2098 - 6 2026-07-08
DAL2068 - 6 2026-06-20
DAL952 - 5 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2549 ATL → IAD Jul 14, 03:05 UTCJul 14, 04:25 UTC1h 20m
2026-07-13 DAL483 BUR → ATL Jul 13, 21:00 UTCJul 14, 01:05 UTC4h 5m
2026-07-13 DAL483 - Jul 13, 15:40 UTCJul 13, 19:40 UTC4h 0m
2026-07-13 DAL3080 IAD → ATL Jul 13, 12:50 UTCJul 13, 14:10 UTC1h 20m
2026-07-12 DAL541 SEA → IAD Jul 12, 23:30 UTCJul 13, 04:05 UTC4h 35m
2026-07-12 DAL1358 DEN → SEA Jul 12, 19:15 UTCJul 12, 21:35 UTC2h 20m
2026-07-12 DAL1358 SEA → DEN Jul 12, 15:25 UTCJul 12, 17:35 UTC2h 10m
2026-07-12 DAL925 ANC → SEA Jul 12, 09:35 UTCJul 12, 12:40 UTC3h 5m
2026-07-12 DAL936 - Jul 12, 04:40 UTCJul 12, 07:50 UTC3h 10m
2026-07-11 DAL1061 - Jul 11, 23:10 UTCJul 12, 02:25 UTC3h 15m
2026-07-11 DAL1061 SEA → FAI Jul 11, 18:50 UTCJul 11, 22:05 UTC3h 15m
2026-07-11 DAL372 BNA → SEA Jul 11, 12:40 UTCJul 11, 17:20 UTC4h 40m
2026-07-11 DAL815 - Jul 11, 00:50 UTCJul 11, 04:45 UTC3h 55m
2026-07-11 DAL815 SEA → BNA Jul 11, 00:49 UTCJul 11, 04:46 UTC3h 57m
2026-07-10 DAL2768 - Jul 10, 19:50 UTCJul 10, 22:55 UTC3h 5m
2026-07-10 DAL2768 ANC → SEA Jul 10, 19:48 UTCJul 10, 22:54 UTC3h 6m
2026-07-10 DAL2768 - Jul 10, 15:10 UTCJul 10, 18:10 UTC3h 0m
2026-07-10 DAL2408 FAI → SEA Jul 10, 10:35 UTCJul 10, 13:45 UTC3h 10m
2026-07-10 DAL2186 SEA → FAI Jul 10, 05:05 UTCJul 10, 08:10 UTC3h 5m
2026-07-10 DAL2186 SEA → FAI Jul 10, 05:05 UTCJul 10, 08:14 UTC3h 9m
2026-07-10 DAL2543 DEN → SEA Jul 10, 01:15 UTCJul 10, 03:40 UTC2h 25m
2026-07-09 DAL2543 SEA → DEN Jul 9, 21:45 UTCJul 9, 23:55 UTC2h 10m
2026-07-09 DAL1684 AUS → SEA Jul 9, 16:30 UTCJul 9, 20:20 UTC3h 50m
2026-07-09 DAL1410 BOS → AUS Jul 9, 10:50 UTCJul 9, 14:40 UTC3h 50m
2026-07-09 DAL1410 BOS → AUS Jul 9, 10:50 UTCJul 9, 14:35 UTC3h 45m
2026-07-09 DAL1297 BOS → BOS Jul 9, 06:05 UTCJul 9, 06:10 UTC5m
2026-07-08 DAL1297 AUS → BOS Jul 8, 23:00 UTCJul 9, 02:45 UTC3h 45m
2026-07-08 DAL1297 - Jul 8, 17:30 UTCJul 8, 21:20 UTC3h 50m
2026-07-08 DAL2098 AUS → BOS Jul 8, 12:25 UTCJul 8, 15:50 UTC3h 25m
2026-07-08 DAL1677 - Jul 8, 00:40 UTCJul 8, 04:25 UTC3h 45m
2026-07-08 DAL1677 BOS → AUS Jul 8, 00:39 UTCJul 8, 04:21 UTC3h 42m
2026-07-07 DAL816 - Jul 7, 19:15 UTCJul 7, 23:20 UTC4h 5m
2026-07-07 DAL816 - Jul 7, 13:55 UTCJul 7, 18:00 UTC4h 5m
2026-07-07 DAL1297 - Jul 7, 00:15 UTCJul 7, 03:50 UTC3h 35m
2026-07-06 DAL1297 - Jul 6, 17:40 UTCJul 6, 21:20 UTC3h 40m
2026-07-06 DAL2098 AUS → BOS Jul 6, 12:30 UTCJul 6, 15:55 UTC3h 25m
2026-07-06 DAL1677 - Jul 6, 02:20 UTCJul 6, 06:15 UTC3h 55m
2026-07-05 DAL816 - Jul 5, 18:55 UTCJul 5, 22:40 UTC3h 45m
2026-07-05 DAL816 - Jul 5, 13:30 UTCJul 5, 17:20 UTC3h 50m
2026-07-04 DAL1156 AUS → BOS Jul 4, 19:30 UTCJul 4, 23:40 UTC4h 10m
2026-07-04 DAL1156 AUS → BOS Jul 4, 19:30 UTCJul 4, 23:38 UTC4h 8m
2026-07-04 DAL739 SEA → AUS Jul 4, 14:21 UTCJul 4, 17:47 UTC3h 26m
2026-07-04 DAL739 SEA → AUS Jul 4, 14:25 UTCJul 4, 17:50 UTC3h 25m
2026-07-04 DAL2408 FAI → SEA Jul 4, 09:52 UTCJul 4, 13:01 UTC3h 9m
2026-07-04 DAL2408 - Jul 4, 09:55 UTCJul 4, 13:00 UTC3h 5m
2026-07-04 DAL2186 SEA → FAI Jul 4, 05:26 UTCJul 4, 08:46 UTC3h 20m
2026-07-04 DAL2186 SEA → FAI Jul 4, 05:30 UTCJul 4, 08:50 UTC3h 20m
2026-07-04 DAL2543 ATL → CHA Jul 4, 01:45 UTCJul 4, 04:10 UTC2h 25m
2026-07-03 DAL2543 ATL → CHA Jul 3, 21:55 UTCJul 4, 00:20 UTC2h 25m
2026-07-03 DAL2870 FLL → LGA Jul 3, 18:50 UTCJul 3, 20:40 UTC1h 50m

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 N328DU page for operator, model, and routing details .

Mode-S A38C66 frequently asked

What is Mode-S code A38C66?
A38C66 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N328DU.
Where is Mode-S A38C66 registered?
Mode-S code A38C66 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 A38C66 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A38C66, octal 50706146, decimal 10,718,310.
What flights does A38C66 operate?
Mode-S A38C66 has broadcast 20 distinct callsigns, including DAL750, DAL2508, DAL2408, DAL2442, DAL2186.