Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A39D9B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N332DU · operated by DELTA AIR LINES INC

Hex
A39D9B
Octal
50716633
Decimal
10,722,715
Country
US
Tail
N332DU
Type
BCS3
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A39D9B.

Country allocation

The ICAO 24-bit address A39D9B 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
DAL2140 - 15 2026-07-03
DAL2310 - 12 2026-06-18
DAL794 Delta Air Lines 10 2026-06-04
DAL716 Delta Air Lines 10 2026-04-20
DAL2194 Delta Air Lines 10 2026-07-08
DAL2068 Delta Air Lines 10 2026-07-24
DAL2759 Delta Air Lines 9 2026-06-05
DAL2679 Delta Air Lines 9 2026-07-26
DAL572 Delta Air Lines 8 2026-07-23
DAL2721 - 8 2026-07-09
DAL803 - 7 2026-07-09
DAL2943 Delta Air Lines 7 2026-07-06
DAL2910 Delta Air Lines 7 2026-05-10
DAL2635 - 7 2026-07-09
DAL1493 - 7 2026-06-29
DAL2851 - 6 2026-07-18
DAL2804 - 6 2026-06-27
DAL2644 - 6 2026-06-23
DAL1731 - 6 2026-07-18
DAL1390 - 6 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2679 ATL → BDL Jul 26, 20:05 UTCJul 26, 22:30 UTC2h 25m
2026-07-26 DAL2679 ATL → BDL Jul 26, 16:25 UTCJul 26, 18:30 UTC2h 5m
2026-07-26 DAL1554 BOS → CVG Jul 26, 13:45 UTCJul 26, 14:45 UTC1h 0m
2026-07-25 DAL2503 SAN → SEA Jul 25, 22:30 UTCJul 26, 00:25 UTC1h 55m
2026-07-25 DAL873 TPA → ATL Jul 25, 17:25 UTCJul 25, 20:35 UTC3h 10m
2026-07-25 DAL873 TPA → ATL Jul 25, 12:50 UTCJul 25, 15:50 UTC3h 0m
2026-07-24 DAL2068 RDU → BOS Jul 24, 00:10 UTCJul 24, 02:30 UTC2h 20m
2026-07-23 DAL2068 RDU → BOS Jul 23, 20:10 UTCJul 23, 22:45 UTC2h 35m
2026-07-23 DAL572 ATL → BOS Jul 23, 16:15 UTCJul 23, 18:35 UTC2h 20m
2026-07-23 DAL572 ATL → BOS Jul 23, 12:00 UTCJul 23, 14:35 UTC2h 35m
2026-07-23 DAL2445 DTW → CMH Jul 23, 00:30 UTCJul 23, 03:10 UTC2h 40m
2026-07-22 DAL1387 BOS → RDU Jul 22, 20:20 UTCJul 22, 23:05 UTC2h 45m
2026-07-22 DAL1322 DTW → BOS Jul 22, 15:45 UTCJul 22, 18:45 UTC3h 0m
2026-07-21 DAL2411 ATL → LGA Jul 21, 12:10 UTCJul 21, 14:50 UTC2h 40m
2026-07-21 DAL2068 RDU → BOS Jul 21, 00:10 UTCJul 21, 02:30 UTC2h 20m
2026-07-20 DAL2068 RDU → BOS Jul 20, 19:50 UTCJul 20, 22:15 UTC2h 25m
2026-07-20 DAL1172 DCA → LGA Jul 20, 12:35 UTCJul 20, 13:20 UTC45m
2026-07-20 DAL2962 - Jul 20, 00:10 UTCJul 20, 02:05 UTC1h 55m
2026-07-19 DAL2678 - Jul 19, 20:00 UTCJul 19, 22:25 UTC2h 25m
2026-07-19 DAL2099 ATL → BOS Jul 19, 15:10 UTCJul 19, 18:15 UTC3h 5m
2026-07-19 DAL370 KOA → LAX Jul 19, 11:05 UTCJul 19, 13:25 UTC2h 20m
2026-07-19 DAL370 KOA → LAX Jul 19, 11:04 UTCJul 19, 13:22 UTC2h 18m
2026-07-19 DAL2256 LGA → MSY Jul 19, 02:50 UTCJul 19, 05:40 UTC2h 50m
2026-07-18 DAL2768 - Jul 18, 22:40 UTCJul 19, 00:45 UTC2h 5m
2026-07-18 DAL2768 ANC → SEA Jul 18, 22:36 UTCJul 19, 01:31 UTC2h 55m
2026-07-18 DAL2768 SEA → ANC Jul 18, 17:45 UTCJul 18, 21:10 UTC3h 25m
2026-07-18 DAL1731 DEN → SEA Jul 18, 12:45 UTCJul 18, 15:00 UTC2h 15m
2026-07-18 DAL2851 SEA → DEN Jul 18, 03:57 UTCJul 18, 06:06 UTC2h 9m
2026-07-18 DAL2851 SEA → DEN Jul 18, 04:00 UTCJul 18, 06:10 UTC2h 10m
2026-07-17 DAL2105 - Jul 17, 12:15 UTCJul 17, 15:29 UTC3h 15m
2026-07-17 DAL2256 LGA → MSY Jul 17, 01:35 UTCJul 17, 04:35 UTC3h 0m
2026-07-16 DAL2768 - Jul 16, 19:45 UTCJul 16, 22:45 UTC3h 0m
2026-07-16 DAL2768 SEA → ANC Jul 16, 15:00 UTCJul 16, 18:15 UTC3h 15m
2026-07-16 DAL2218 GEG → SEA Jul 16, 12:44 UTCJul 16, 13:25 UTC40m
2026-07-16 DAL2354 SEA → GEG Jul 16, 06:10 UTCJul 16, 06:50 UTC40m
2026-07-16 DAL2318 - Jul 16, 02:00 UTCJul 16, 04:15 UTC2h 15m
2026-07-15 DAL2318 - Jul 15, 22:25 UTCJul 16, 00:55 UTC2h 30m
2026-07-15 DAL1684 - Jul 15, 16:25 UTCJul 15, 20:00 UTC3h 35m
2026-07-15 DAL1410 BOS → AUS Jul 15, 10:45 UTCJul 15, 14:25 UTC3h 40m
2026-07-14 DAL2677 - Jul 14, 22:40 UTCJul 15, 01:00 UTC2h 19m
2026-07-14 DAL2677 BOS → BNA Jul 14, 18:55 UTCJul 14, 21:00 UTC2h 5m
2026-07-14 DAL675 - Jul 14, 14:50 UTCJul 14, 17:35 UTC2h 45m
2026-07-14 DAL675 MCI → BOS Jul 14, 14:48 UTCJul 14, 17:37 UTC2h 49m
2026-07-14 DAL675 - Jul 14, 10:20 UTCJul 14, 13:00 UTC2h 40m
2026-07-14 DAL1297 BOS → BOS Jul 14, 05:30 UTCJul 14, 05:50 UTC20m
2026-07-14 DAL1297 - Jul 14, 00:30 UTCJul 14, 04:20 UTC3h 50m
2026-07-13 DAL831 SEA → AUS Jul 13, 18:15 UTCJul 13, 22:10 UTC3h 55m
2026-07-13 DAL1015 IAD → SEA Jul 13, 11:10 UTCJul 13, 16:00 UTC4h 50m
2026-07-13 DAL2549 - Jul 13, 04:35 UTCJul 13, 06:01 UTC1h 25m
2026-07-12 DAL483 BUR → ATL Jul 12, 21:45 UTCJul 13, 02:10 UTC4h 25m

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 N332DU page for operator, model, and routing details .

Mode-S A39D9B frequently asked

What is Mode-S code A39D9B?
A39D9B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N332DU.
Where is Mode-S A39D9B registered?
Mode-S code A39D9B 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 A39D9B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39D9B, octal 50716633, decimal 10,722,715.
What flights does A39D9B operate?
Mode-S A39D9B has broadcast 20 distinct callsigns, including DAL2140, DAL2310, DAL794, DAL716, DAL2194.