Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A3B79C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N339DU · operated by DELTA AIR LINES INC

Hex
A3B79C
Octal
50733634
Decimal
10,729,372
Country
US
Tail
N339DU
Transponder active on ground
Flights observed
289
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A3B79C.

Country allocation

The ICAO 24-bit address A3B79C 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
DAL2068 - 13 2026-07-14
DAL572 - 11 2026-07-14
DAL2140 - 10 2026-07-10
DAL2503 - 9 2026-07-13
DAL1390 - 9 2026-06-27
DAL2985 - 7 2026-06-26
DAL2310 - 7 2026-07-13
DAL2099 - 6 2026-07-07
DAL1404 Delta Air Lines 6 2026-05-28
DAL952 - 5 2026-07-20
DAL803 Delta Air Lines 5 2026-07-26
DAL2917 - 5 2026-07-13
DAL2635 Delta Air Lines 5 2026-07-26
DAL2461 - 5 2026-07-12
DAL1554 - 5 2026-07-16
DAL1368 - 5 2026-07-12
DAL831 Delta Air Lines 4 2026-07-25
DAL2870 Delta Air Lines 4 2026-06-15
DAL2748 - 4 2026-06-25
DAL2679 Delta Air Lines 4 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL408 CVG → SLC Jul 26, 21:25 UTCJul 26, 23:00 UTC1h 35m
2026-07-26 DAL803 LAX → SEA Jul 26, 16:30 UTCJul 26, 19:55 UTC3h 25m
2026-07-26 DAL2721 DAY → ATL Jul 26, 13:05 UTCJul 26, 14:30 UTC1h 25m
2026-07-26 DAL2635 MSP → PIT Jul 26, 05:00 UTCJul 26, 06:55 UTC1h 56m
2026-07-26 DAL2635 MSP → PIT Jul 26, 04:59 UTCJul 26, 06:46 UTC1h 47m
2026-07-25 DAL831 SEA → AUS Jul 25, 23:35 UTCJul 26, 03:30 UTC3h 55m
2026-07-25 DAL831 SEA → AUS Jul 25, 18:20 UTCJul 25, 21:50 UTC3h 30m
2026-07-25 DAL372 BNA → SEA Jul 25, 12:20 UTCJul 25, 16:40 UTC4h 20m
2026-07-25 DAL815 LAS → BOS Jul 25, 02:50 UTCJul 25, 06:30 UTC3h 40m
2026-07-24 DAL2768 OAK → SLC Jul 24, 22:35 UTCJul 25, 01:30 UTC2h 55m
2026-07-24 DAL2768 OAK → SLC Jul 24, 22:31 UTCJul 25, 01:26 UTC2h 55m
2026-07-24 DAL2768 OAK → SLC Jul 24, 15:45 UTCJul 24, 18:50 UTC3h 5m
2026-07-24 DAL925 DFW → LGA Jul 24, 11:05 UTCJul 24, 14:05 UTC3h 0m
2026-07-23 DAL928 PHX → JFK Jul 23, 22:00 UTCJul 24, 01:15 UTC3h 15m
2026-07-23 DAL1684 JFK → FLL Jul 23, 16:25 UTCJul 23, 20:05 UTC3h 40m
2026-07-23 DAL1410 PHL → ATL Jul 23, 11:00 UTCJul 23, 14:45 UTC3h 45m
2026-07-23 DAL1410 PHL → ATL Jul 23, 10:55 UTCJul 23, 14:41 UTC3h 46m
2026-07-22 DAL816 LAX → AUS Jul 22, 20:05 UTCJul 22, 23:45 UTC3h 40m
2026-07-22 DAL816 LAX → AUS Jul 22, 14:55 UTCJul 22, 18:50 UTC3h 55m
2026-07-22 DAL314 JFK → SFO Jul 22, 03:20 UTCJul 22, 05:25 UTC2h 5m
2026-07-21 DAL462 LAS → JFK Jul 21, 22:45 UTCJul 22, 01:55 UTC3h 10m
2026-07-21 DAL803 LAX → SEA Jul 21, 16:30 UTCJul 21, 19:55 UTC3h 25m
2026-07-21 DAL804 MCI → LGA Jul 21, 11:40 UTCJul 21, 15:10 UTC3h 30m
2026-07-21 DAL870 JFK → LAS Jul 21, 01:20 UTCJul 21, 04:45 UTC3h 25m
2026-07-20 DAL952 - Jul 20, 21:35 UTCJul 20, 23:45 UTC2h 10m
2026-07-20 DAL952 - Jul 20, 17:30 UTCJul 20, 19:50 UTC2h 20m
2026-07-20 DAL2105 DTW → GRR Jul 20, 12:15 UTCJul 20, 15:35 UTC3h 20m
2026-07-20 DAL2256 LGA → MSY Jul 20, 00:50 UTCJul 20, 03:35 UTC2h 45m
2026-07-19 DAL1412 MSP → SLC Jul 19, 20:50 UTCJul 19, 22:22 UTC1h 32m
2026-07-19 DAL1412 MSP → SLC Jul 19, 20:50 UTCJul 19, 22:20 UTC1h 30m
2026-07-19 DAL1412 MSP → SLC Jul 19, 17:20 UTCJul 19, 19:05 UTC1h 45m
2026-07-19 DAL804 MCI → LGA Jul 19, 11:45 UTCJul 19, 15:15 UTC3h 30m
2026-07-19 DAL870 SEA → DFW Jul 19, 01:00 UTCJul 19, 04:25 UTC3h 25m
2026-07-18 DAL952 - Jul 18, 21:15 UTCJul 18, 23:25 UTC2h 10m
2026-07-18 DAL952 SNA → SEA Jul 18, 21:15 UTCJul 18, 23:26 UTC2h 11m
2026-07-18 DAL952 SEA → SNA Jul 18, 17:30 UTCJul 18, 19:55 UTC2h 25m
2026-07-18 DAL2105 - Jul 18, 12:20 UTCJul 18, 15:35 UTC3h 15m
2026-07-18 DAL563 - Jul 18, 00:15 UTCJul 18, 02:40 UTC2h 25m
2026-07-17 DAL2088 AUS → BOS Jul 17, 19:35 UTCJul 17, 22:45 UTC3h 10m
2026-07-17 DAL2673 - Jul 17, 15:49 UTCJul 17, 18:15 UTC2h 25m
2026-07-17 DAL1493 DCA → MSP Jul 17, 12:15 UTCJul 17, 14:24 UTC2h 10m
2026-07-16 DAL2962 MSP → DCA Jul 16, 23:59 UTCJul 17, 01:59 UTC2h 0m
2026-07-16 DAL1554 - Jul 16, 15:14 UTCJul 16, 16:19 UTC1h 5m
2026-07-16 DAL1554 ORD → MSP Jul 16, 15:14 UTCJul 16, 16:15 UTC1h 1m
2026-07-16 DAL2251 LGA → ORD Jul 16, 10:15 UTCJul 16, 12:14 UTC2h 0m
2026-07-16 DAL2251 LGA → ORD Jul 16, 10:12 UTCJul 16, 12:16 UTC2h 4m
2026-07-16 DAL2445 MSY → LGA Jul 16, 01:00 UTCJul 16, 03:45 UTC2h 45m
2026-07-15 DAL1387 JFK → MSY Jul 15, 19:50 UTCJul 15, 22:25 UTC2h 35m
2026-07-15 DAL1322 MSY → JFK Jul 15, 15:30 UTCJul 15, 18:20 UTC2h 50m
2026-07-15 DAL2411 LGA → MSY Jul 15, 11:30 UTCJul 15, 14:05 UTC2h 35m

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 N339DU page for operator, model, and routing details .

Mode-S A3B79C frequently asked

What is Mode-S code A3B79C?
A3B79C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N339DU.
Where is Mode-S A3B79C registered?
Mode-S code A3B79C 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 A3B79C broadcasting right now?
Mode-S A3B79C is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3B79C, octal 50733634, decimal 10,729,372.
What flights does A3B79C operate?
Mode-S A3B79C has broadcast 20 distinct callsigns, including DAL2068, DAL572, DAL2140, DAL2503, DAL1390.