Apparatus

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sensors Mode-S transponder

A3C163

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N341DU · operated by DELTA AIR LINES INC

Hex
A3C163
Octal
50740543
Decimal
10,731,875
Country
US
Tail
N341DU
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
417
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A3C163.

Country allocation

The ICAO 24-bit address A3C163 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
DAL9936 Delta Air Lines 71 2026-05-11
DAL1412 - 13 2026-07-08
DAL952 - 11 2026-07-07
DAL2677 - 10 2026-07-18
DAL803 - 9 2026-07-11
DAL2449 Delta Air Lines 9 2026-07-04
DAL2105 - 9 2026-07-06
DAL870 - 8 2026-07-11
DAL831 Delta Air Lines 8 2026-07-21
DAL2768 - 8 2026-07-20
DAL2412 Delta Air Lines 8 2026-07-23
DAL2374 Delta Air Lines 8 2026-07-03
DAL2256 - 8 2026-07-06
DAL804 - 7 2026-07-11
DAL2804 Delta Air Lines 7 2026-07-23
DAL2442 Delta Air Lines 7 2026-06-03
DAL816 - 6 2026-07-13
DAL483 - 6 2026-06-29
DAL2721 - 6 2026-07-10
DAL922 Delta Air Lines 5 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1387 BOS → RDU Jul 26, 20:05 UTCJul 26, 22:45 UTC2h 40m
2026-07-26 DAL1322 DTW → BOS Jul 26, 15:30 UTCJul 26, 18:25 UTC2h 55m
2026-07-26 DAL2411 ATL → LGA Jul 26, 11:37 UTCJul 26, 14:09 UTC2h 32m
2026-07-26 DAL2099 ATL → BOS Jul 26, 11:40 UTCJul 26, 14:10 UTC2h 30m
2026-07-25 DAL2099 ATL → BOS Jul 25, 21:15 UTCJul 26, 00:20 UTC3h 5m
2026-07-25 DAL2673 PVD → ATL Jul 25, 16:15 UTCJul 25, 18:30 UTC2h 15m
2026-07-25 DAL1554 BOS → CVG Jul 25, 13:50 UTCJul 25, 14:45 UTC55m
2026-07-24 DAL2513 DTW → GRR Jul 24, 23:05 UTCJul 25, 01:10 UTC2h 5m
2026-07-24 DAL1404 JFK → JAX Jul 24, 20:00 UTCJul 24, 21:35 UTC1h 35m
2026-07-24 DAL1404 JFK → JAX Jul 24, 16:50 UTCJul 24, 18:25 UTC1h 35m
2026-07-24 DAL1417 JFK → FLL Jul 24, 12:10 UTCJul 24, 15:20 UTC3h 10m
2026-07-24 DAL1417 JFK → FLL Jul 24, 12:08 UTCJul 24, 15:15 UTC3h 7m
2026-07-23 DAL2109 MIA → LGA Jul 23, 23:10 UTCJul 24, 02:15 UTC3h 5m
2026-07-23 DAL2412 LAX → SFO Jul 23, 18:35 UTCJul 23, 21:05 UTC2h 30m
2026-07-23 DAL2412 LAX → SFO Jul 23, 18:31 UTCJul 23, 21:02 UTC2h 31m
2026-07-23 DAL2412 LAX → SFO Jul 23, 14:45 UTCJul 23, 17:15 UTC2h 30m
2026-07-23 DAL2767 CMH → ATL Jul 23, 11:15 UTCJul 23, 12:50 UTC1h 35m
2026-07-23 DAL2804 ATL → DAY Jul 23, 01:32 UTCJul 23, 03:53 UTC2h 21m
2026-07-23 DAL2804 ATL → DAY Jul 23, 01:35 UTCJul 23, 03:50 UTC2h 15m
2026-07-22 DAL1156 BNA → BOS Jul 22, 20:25 UTCJul 23, 00:05 UTC3h 40m
2026-07-22 DAL739 MIA → LAX Jul 22, 14:35 UTCJul 22, 18:20 UTC3h 45m
2026-07-22 DAL925 DFW → LGA Jul 22, 11:10 UTCJul 22, 13:00 UTC1h 50m
2026-07-22 DAL936 JFK → DEN Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-21 DAL831 SEA → AUS Jul 21, 23:55 UTCJul 22, 03:35 UTC3h 40m
2026-07-21 DAL831 SEA → AUS Jul 21, 23:51 UTCJul 22, 03:31 UTC3h 40m
2026-07-21 DAL831 SEA → AUS Jul 21, 18:50 UTCJul 21, 22:30 UTC3h 40m
2026-07-21 DAL853 ANC → SEA Jul 21, 14:00 UTCJul 21, 17:06 UTC3h 6m
2026-07-21 DAL853 ANC → SEA Jul 21, 14:00 UTCJul 21, 17:25 UTC3h 25m
2026-07-20 DAL2768 - Jul 20, 14:55 UTCJul 20, 18:00 UTC3h 5m
2026-07-20 DAL2218 GEG → SEA Jul 20, 12:35 UTCJul 20, 13:20 UTC45m
2026-07-20 DAL2354 - Jul 20, 06:15 UTCJul 20, 06:55 UTC40m
2026-07-20 DAL2318 CLT → ATL Jul 20, 02:15 UTCJul 20, 04:35 UTC2h 20m
2026-07-19 DAL2318 CLT → ATL Jul 19, 22:15 UTCJul 20, 00:40 UTC2h 25m
2026-07-19 DAL1684 AUS → SEA Jul 19, 16:30 UTCJul 19, 20:15 UTC3h 45m
2026-07-19 DAL1410 BOS → AUS Jul 19, 10:50 UTCJul 19, 14:30 UTC3h 40m
2026-07-18 DAL2141 BNA → BOS Jul 18, 19:35 UTCJul 18, 21:50 UTC2h 15m
2026-07-18 DAL2141 BNA → BOS Jul 18, 19:31 UTCJul 18, 21:40 UTC2h 9m
2026-07-18 DAL2141 - Jul 18, 14:10 UTCJul 18, 16:45 UTC2h 35m
2026-07-18 DAL2677 BNH → BNH Jul 18, 12:45 UTCJul 18, 12:50 UTC5m
2026-07-18 DAL2677 BOS → BOS Jul 18, 07:15 UTCJul 18, 07:20 UTC5m
2026-07-17 DAL2677 BNA → BNH Jul 17, 22:55 UTCJul 18, 01:10 UTC2h 15m
2026-07-17 DAL2677 BOS → BNA Jul 17, 18:49 UTCJul 17, 21:03 UTC2h 14m
2026-07-17 DAL2677 BOS → BNA Jul 17, 18:50 UTCJul 17, 21:00 UTC2h 10m
2026-07-17 DAL675 MCI → BOS Jul 17, 14:39 UTCJul 17, 17:20 UTC2h 40m
2026-07-17 DAL675 - Jul 17, 10:25 UTCJul 17, 13:20 UTC2h 55m
2026-07-17 DAL314 JFK → SFO Jul 17, 00:55 UTCJul 17, 03:30 UTC2h 35m
2026-07-16 DAL314 JFK → SFO Jul 16, 20:25 UTCJul 16, 23:25 UTC3h 0m
2026-07-16 DAL2141 BNA → BNH Jul 16, 16:19 UTCJul 16, 18:44 UTC2h 25m
2026-07-16 DAL2141 - Jul 16, 12:34 UTCJul 16, 14:45 UTC2h 10m
2026-07-16 DAL2677 BNH → BNH Jul 16, 11:34 UTCJul 16, 11:40 UTC5m

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 N341DU page for operator, model, and routing details .

Mode-S A3C163 frequently asked

What is Mode-S code A3C163?
A3C163 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N341DU.
Where is Mode-S A3C163 registered?
Mode-S code A3C163 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 A3C163 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 A3C163, octal 50740543, decimal 10,731,875.
What flights does A3C163 operate?
Mode-S A3C163 has broadcast 20 distinct callsigns, including DAL9936, DAL1412, DAL952, DAL2677, DAL803.