Apparatus

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sensors Mode-S transponder

A1373D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N178DN · BOEING 767-300 · operated by DELTA AIR LINES INC

Hex
A1373D
Octal
50233475
Decimal
10,565,437
Country
US
Tail
N178DN
Type
B763
No current signal · last broadcast Jul 26, 19:00 UTC
Flights observed
298
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:00 UTC

Last known position

Most recent position reported by Mode-S A1373D.

Country allocation

The ICAO 24-bit address A1373D 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
DAL79 Delta Air Lines 38 2026-07-23
DAL669 Delta Air Lines 34 2026-07-24
DAL78 Delta Air Lines 33 2026-07-22
DAL365 Delta Air Lines 29 2026-07-24
DAL285 Delta Air Lines 26 2026-07-26
DAL691 Delta Air Lines 24 2026-07-25
DAL284 Delta Air Lines 20 2026-07-26
DAL531 Delta Air Lines 16 2026-07-24
DAL9961 Delta Air Lines 8 2026-04-16
DAL488 Delta Air Lines 8 2026-06-04
DAL823 Delta Air Lines 7 2026-06-04
DAL672 Delta Air Lines 7 2026-07-25
DAL416 - 5 2026-07-05
DAL2204 Delta Air Lines 3 2026-05-04
DAL1510 Delta Air Lines 3 2026-05-03
DAL9887 - 2 2026-06-29
DAL701 Delta Air Lines 2 2026-05-15
DAL680 Delta Air Lines 2 2026-05-06
DAL679 - 2 2026-06-24
DAL668 Delta Air Lines 2 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL285 SFO → JFK Jul 26, 12:20 UTCJul 26, 18:55 UTC6h 35m
2026-07-26 DAL284 ICN → DTW Jul 26, 04:45 UTCJul 26, 10:15 UTC5h 31m
2026-07-25 DAL691 DFW → LGA Jul 25, 21:45 UTCJul 26, 02:30 UTC4h 45m
2026-07-25 DAL672 SAN → JFK Jul 25, 13:55 UTCJul 25, 18:20 UTC4h 25m
2026-07-24 DAL531 LAX → SFO Jul 24, 21:30 UTCJul 25, 01:35 UTC4h 5m
2026-07-24 DAL669 MSP → SEA Jul 24, 13:25 UTCJul 24, 19:10 UTC5h 45m
2026-07-24 DAL365 ATL → MEX Jul 24, 05:45 UTCJul 24, 10:30 UTC4h 45m
2026-07-23 DAL365 ATL → MEX Jul 23, 21:25 UTCJul 24, 03:25 UTC6h 0m
2026-07-23 DAL79 PRG → JFK Jul 23, 09:15 UTCJul 23, 17:20 UTC8h 5m
2026-07-22 DAL78 JFK → PRG Jul 22, 23:40 UTCJul 23, 07:20 UTC7h 40m
2026-07-22 DAL285 SFO → JFK Jul 22, 12:20 UTCJul 22, 19:10 UTC6h 50m
2026-07-22 DAL285 SFO → JFK Jul 22, 12:18 UTCJul 22, 19:04 UTC6h 46m
2026-07-22 DAL284 ICN → DTW Jul 22, 04:30 UTCJul 22, 05:25 UTC55m
2026-07-21 DAL79 PRG → JFK Jul 21, 09:16 UTCJul 21, 17:48 UTC8h 32m
2026-07-21 DAL79 PRG → JFK Jul 21, 09:16 UTCJul 21, 17:51 UTC8h 35m
2026-07-20 DAL78 JFK → PRG Jul 20, 23:10 UTCJul 21, 05:15 UTC6h 4m
2026-07-20 DAL78 JFK → PRG Jul 20, 23:10 UTCJul 21, 06:35 UTC7h 25m
2026-07-20 DAL285 SFO → JFK Jul 20, 12:15 UTCJul 20, 18:45 UTC6h 30m
2026-07-20 DAL284 ICN → DTW Jul 20, 04:30 UTCJul 20, 10:00 UTC5h 30m
2026-07-19 DAL691 DFW → LGA Jul 19, 21:10 UTCJul 20, 01:55 UTC4h 45m
2026-07-19 DAL669 JFK → SFO Jul 19, 13:42 UTCJul 19, 18:58 UTC5h 16m
2026-07-19 DAL669 JFK → SFO Jul 19, 13:45 UTCJul 19, 19:00 UTC5h 15m
2026-07-19 DAL365 ATL → MEX Jul 19, 06:30 UTCJul 19, 11:20 UTC4h 50m
2026-07-18 DAL363 JFK → SFO Jul 18, 23:05 UTCJul 19, 04:30 UTC5h 25m
2026-07-18 DAL79 - Jul 18, 18:00 UTCJul 18, 18:05 UTC5m
2026-07-18 DAL79 PRG → JFK Jul 18, 09:17 UTCJul 18, 17:41 UTC8h 24m
2026-07-18 DAL79 PRG → JFK Jul 18, 09:17 UTCJul 18, 17:45 UTC8h 28m
2026-07-18 DAL79 - Jul 18, 09:20 UTCJul 18, 11:45 UTC2h 25m
2026-07-17 DAL78 JFK → PRG Jul 17, 23:19 UTCJul 18, 07:05 UTC7h 46m
2026-07-17 DAL78 - Jul 17, 23:20 UTCJul 18, 00:55 UTC1h 35m
2026-07-17 DAL285 - Jul 17, 12:19 UTCJul 17, 18:44 UTC6h 25m
2026-07-17 DAL285 SNN → JFK Jul 17, 12:17 UTCJul 17, 18:42 UTC6h 25m
2026-07-17 DAL284 - Jul 17, 04:54 UTCJul 17, 10:30 UTC5h 35m
2026-07-16 DAL691 - Jul 16, 21:10 UTCJul 17, 02:15 UTC5h 5m
2026-07-16 DAL672 ATL → SFO Jul 16, 15:00 UTCJul 16, 19:10 UTC4h 10m
2026-07-14 DAL531 SFO → ATL Jul 14, 21:45 UTCJul 15, 02:05 UTC4h 19m
2026-07-14 DAL669 JFK → SFO Jul 14, 13:10 UTCJul 14, 18:20 UTC5h 10m
2026-07-14 DAL365 SFO → JFK Jul 14, 05:45 UTCJul 14, 10:55 UTC5h 10m
2026-07-13 DAL365 - Jul 13, 21:05 UTCJul 14, 02:30 UTC5h 25m
2026-07-13 DAL79 - Jul 13, 09:25 UTCJul 13, 11:50 UTC2h 25m
2026-07-13 DAL79 PRG → JFK Jul 13, 09:25 UTCJul 13, 17:40 UTC8h 15m
2026-07-13 DAL79 PRG → JFK Jul 13, 09:25 UTCJul 13, 17:38 UTC8h 13m
2026-07-12 DAL78 - Jul 12, 23:10 UTCJul 13, 00:50 UTC1h 40m
2026-07-12 DAL78 JFK → PRG Jul 12, 23:09 UTCJul 13, 06:45 UTC7h 36m
2026-07-12 DAL285 - Jul 12, 12:40 UTCJul 12, 18:50 UTC6h 10m
2026-07-12 DAL284 - Jul 12, 05:01 UTCJul 12, 10:40 UTC5h 40m
2026-07-11 DAL691 SFO → JFK Jul 11, 20:55 UTCJul 12, 02:05 UTC5h 10m
2026-07-11 DAL672 ATL → SFO Jul 11, 14:00 UTCJul 11, 18:20 UTC4h 20m
2026-07-10 DAL531 - Jul 10, 21:45 UTCJul 11, 01:45 UTC4h 0m
2026-07-10 DAL669 JFK → SFO Jul 10, 13:20 UTCJul 10, 18:50 UTC5h 30m

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 N178DN page for operator, model, and routing details .

Mode-S A1373D frequently asked

What is Mode-S code A1373D?
A1373D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N178DN.
Where is Mode-S A1373D registered?
Mode-S code A1373D 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 A1373D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1373D, octal 50233475, decimal 10,565,437.
What flights does A1373D operate?
Mode-S A1373D has broadcast 20 distinct callsigns, including DAL79, DAL669, DAL78, DAL365, DAL285.