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
Broadcasting now · callsign DAL2408 · 25,400 ft
Flights observed
430
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Current position

A38C66 is currently broadcasting. Map zoomed to live position.

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
DAL1297 Delta Air Lines 15 2026-07-23
DAL2408 - 14 2026-07-10
DAL816 - 13 2026-07-16
DAL2442 Delta Air Lines 13 2026-05-11
DAL2186 - 13 2026-07-10
DAL922 Delta Air Lines 10 2026-05-09
DAL483 - 9 2026-07-13
DAL2768 - 9 2026-07-10
DAL928 Delta Air Lines 8 2026-07-25
DAL1677 - 8 2026-07-17
DAL1358 - 8 2026-07-12
DAL803 - 7 2026-07-16
DAL541 - 7 2026-07-12
DAL2635 - 7 2026-07-15
DAL2572 Delta Air Lines 7 2026-05-05
DAL2098 - 7 2026-07-17
DAL925 Delta Air Lines 6 2026-07-25
DAL2646 - 6 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2449 BOS → JFK Jul 26, 19:00 UTCJul 26, 21:30 UTC2h 30m
2026-07-26 DAL853 ANC → SEA Jul 26, 14:10 UTCJul 26, 17:25 UTC3h 15m
2026-07-25 DAL928 PHX → JFK Jul 25, 22:05 UTCJul 26, 01:05 UTC3h 0m
2026-07-25 DAL2870 FLL → LGA Jul 25, 18:30 UTCJul 25, 19:55 UTC1h 25m
2026-07-25 DAL2870 FLL → LGA Jul 25, 18:29 UTCJul 25, 19:58 UTC1h 29m
2026-07-25 DAL2870 FLL → LGA Jul 25, 15:00 UTCJul 25, 17:00 UTC2h 0m
2026-07-25 DAL925 DFW → LGA Jul 25, 09:55 UTCJul 25, 13:00 UTC3h 5m
2026-07-25 DAL936 JFK → DEN Jul 25, 05:35 UTCJul 25, 08:40 UTC3h 5m
2026-07-25 DAL2318 CLT → ATL Jul 25, 01:55 UTCJul 25, 04:00 UTC2h 5m
2026-07-24 DAL2318 CLT → ATL Jul 24, 22:15 UTCJul 25, 00:40 UTC2h 25m
2026-07-24 DAL1684 JFK → FLL Jul 24, 16:20 UTCJul 24, 20:00 UTC3h 40m
2026-07-24 DAL1410 PHL → ATL Jul 24, 10:40 UTCJul 24, 14:25 UTC3h 45m
2026-07-23 DAL1297 LGA → MSY Jul 23, 23:30 UTCJul 24, 03:00 UTC3h 30m
2026-07-23 DAL1297 LGA → MSY Jul 23, 18:00 UTCJul 23, 21:45 UTC3h 45m
2026-07-23 DAL2828 LAX → DEN Jul 23, 14:45 UTCJul 23, 16:30 UTC1h 45m
2026-07-23 DAL2828 LAX → DEN Jul 23, 14:41 UTCJul 23, 16:30 UTC1h 49m
2026-07-22 DAL2513 - Jul 22, 23:10 UTCJul 23, 01:20 UTC2h 10m
2026-07-22 DAL2513 LGA → ORD Jul 22, 23:09 UTCJul 23, 01:05 UTC1h 56m
2026-07-22 DAL1404 JFK → JAX Jul 22, 20:15 UTCJul 22, 21:40 UTC1h 25m
2026-07-22 DAL1404 JFK → JAX Jul 22, 16:50 UTCJul 22, 18:25 UTC1h 35m
2026-07-22 DAL1417 - Jul 22, 12:10 UTCJul 22, 15:15 UTC3h 5m
2026-07-20 DAL2109 MIA → LGA Jul 20, 23:05 UTCJul 21, 02:05 UTC2h 59m
2026-07-20 DAL2109 MIA → LGA Jul 20, 23:03 UTCJul 21, 02:11 UTC3h 8m
2026-07-20 DAL2412 SRQ → LGA Jul 20, 18:40 UTCJul 20, 21:10 UTC2h 30m
2026-07-20 DAL2412 - Jul 20, 15:00 UTCJul 20, 17:20 UTC2h 20m
2026-07-20 DAL2767 CMH → ATL Jul 20, 11:15 UTCJul 20, 12:50 UTC1h 35m
2026-07-20 DAL2804 ATL → DAY Jul 20, 01:43 UTCJul 20, 03:52 UTC2h 9m
2026-07-20 DAL2804 ATL → DAY Jul 20, 01:45 UTCJul 20, 03:55 UTC2h 10m
2026-07-19 DAL2785 - Jul 19, 21:55 UTCJul 19, 23:50 UTC1h 55m
2026-07-19 DAL2785 - Jul 19, 18:35 UTCJul 19, 20:40 UTC2h 5m
2026-07-18 DAL2689 RDU → DTW Jul 18, 23:45 UTCJul 19, 01:25 UTC1h 40m
2026-07-18 DAL2689 RDU → DTW Jul 18, 23:43 UTCJul 19, 01:18 UTC1h 35m
2026-07-18 DAL2689 RDU → DTW Jul 18, 18:25 UTCJul 18, 20:15 UTC1h 50m
2026-07-18 DAL1022 RDU → BNH Jul 18, 15:05 UTCJul 18, 16:50 UTC1h 45m
2026-07-18 DAL2066 BOS → RDU Jul 18, 11:55 UTCJul 18, 13:30 UTC1h 35m
2026-07-17 DAL1297 AUS → BOS Jul 17, 23:00 UTCJul 18, 02:35 UTC3h 35m
2026-07-17 DAL1297 AUS → BOS Jul 17, 22:58 UTCJul 18, 02:31 UTC3h 33m
2026-07-17 DAL1297 - Jul 17, 17:44 UTCJul 17, 21:20 UTC3h 35m
2026-07-17 DAL2098 - Jul 17, 12:30 UTCJul 17, 16:00 UTC3h 30m
2026-07-17 DAL1677 - Jul 17, 02:59 UTCJul 17, 06:35 UTC3h 35m
2026-07-16 DAL816 - Jul 16, 21:40 UTCJul 17, 01:25 UTC3h 45m
2026-07-16 DAL816 - Jul 16, 16:30 UTCJul 16, 20:25 UTC3h 55m
2026-07-16 DAL462 - Jul 16, 11:45 UTCJul 16, 14:55 UTC3h 10m
2026-07-16 DAL803 DFW → DFW Jul 16, 05:35 UTCJul 16, 05:40 UTC5m
2026-07-16 DAL803 DFW → DFW Jul 16, 03:05 UTCJul 16, 03:10 UTC5m
2026-07-15 DAL803 - Jul 15, 21:40 UTCJul 15, 22:35 UTC55m
2026-07-15 DAL803 OKC → DFW Jul 15, 21:35 UTCJul 15, 22:17 UTC42m
2026-07-15 DAL803 SEA → OKC Jul 15, 16:50 UTCJul 15, 20:35 UTC3h 45m
2026-07-15 DAL2721 - Jul 15, 13:05 UTCJul 15, 14:30 UTC1h 25m
2026-07-15 DAL2635 - Jul 15, 05:30 UTCJul 15, 07:25 UTC1h 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 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?
Yes. Mode-S A38C66 is currently airborne.
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, DAL1297, DAL2408, DAL816.