Apparatus

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sensors Mode-S transponder

A43423

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N370DN · AIRBUS A-321 · operated by DELTA AIR LINES INC

Hex
A43423
Octal
51032043
Decimal
10,761,251
Country
US
Tail
N370DN
Type
A321
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
502
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A43423.

Country allocation

The ICAO 24-bit address A43423 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
DAL994 Delta Air Lines 8 2026-07-23
DAL2454 Delta Air Lines 8 2026-05-05
DAL431 - 7 2026-07-26
DAL1455 - 6 2026-07-08
DAL1349 Delta Air Lines 6 2026-06-26
DAL990 Delta Air Lines 5 2026-05-14
DAL956 Delta Air Lines 5 2026-07-26
DAL557 Delta Air Lines 5 2026-07-23
DAL2849 - 5 2026-07-01
DAL2397 - 5 2026-07-22
DAL2382 Delta Air Lines 5 2026-05-04
DAL989 - 4 2026-06-30
DAL957 Delta Air Lines 4 2026-07-04
DAL896 - 4 2026-07-06
DAL764 Delta Air Lines 4 2026-07-25
DAL530 - 4 2026-07-04
DAL468 Delta Air Lines 4 2026-04-30
DAL460 Delta Air Lines 4 2026-07-26
DAL342 Delta Air Lines 4 2026-05-28
DAL2927 - 4 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL968 MSP → SFO Jul 26, 21:25 UTCJul 26, 22:45 UTC1h 20m
2026-07-26 DAL460 FLL → MSP Jul 26, 17:54 UTCJul 26, 19:37 UTC1h 43m
2026-07-26 DAL460 FLL → MSP Jul 26, 17:55 UTCJul 26, 19:50 UTC1h 55m
2026-07-26 DAL431 DEN → ATL Jul 26, 13:35 UTCJul 26, 16:00 UTC2h 25m
2026-07-26 DAL431 DEN → ATL Jul 26, 13:33 UTCJul 26, 16:06 UTC2h 33m
2026-07-26 DAL956 ALB → ATL Jul 26, 02:55 UTCJul 26, 05:30 UTC2h 35m
2026-07-26 DAL956 ALB → ATL Jul 26, 02:55 UTCJul 26, 05:28 UTC2h 33m
2026-07-25 DAL2053 DTW → ATL Jul 25, 23:15 UTCJul 26, 00:40 UTC1h 25m
2026-07-25 DAL2053 DTW → ATL Jul 25, 23:11 UTCJul 26, 00:35 UTC1h 24m
2026-07-25 DAL2926 DTW → IAH Jul 25, 19:15 UTCJul 25, 21:40 UTC2h 25m
2026-07-25 DAL2926 DTW → IAH Jul 25, 15:10 UTCJul 25, 17:40 UTC2h 30m
2026-07-25 DAL764 MSP → SAT Jul 25, 05:25 UTCJul 25, 09:15 UTC3h 50m
2026-07-25 DAL2145 SLC → GEG Jul 25, 00:05 UTCJul 25, 03:20 UTC3h 15m
2026-07-24 DAL2121 OMA → MSP Jul 24, 19:05 UTCJul 24, 22:20 UTC3h 15m
2026-07-24 DAL2121 OMA → MSP Jul 24, 14:10 UTCJul 24, 17:20 UTC3h 10m
2026-07-24 DAL2538 MSP → BIL Jul 24, 10:15 UTCJul 24, 12:40 UTC2h 25m
2026-07-24 DAL2938 SJC → SLC Jul 24, 03:40 UTCJul 24, 04:40 UTC1h 0m
2026-07-24 DAL1206 JAX → MSP Jul 24, 00:05 UTCJul 24, 01:45 UTC1h 40m
2026-07-23 DAL1206 JAX → MSP Jul 23, 21:15 UTCJul 23, 22:55 UTC1h 40m
2026-07-23 DAL994 MSP → STL Jul 23, 17:55 UTCJul 23, 19:40 UTC1h 45m
2026-07-23 DAL557 PHX → DTW Jul 23, 14:10 UTCJul 23, 16:15 UTC2h 5m
2026-07-23 DAL1460 RIC → ATL Jul 23, 10:00 UTCJul 23, 11:10 UTC1h 10m
2026-07-23 DAL1460 RIC → ATL Jul 23, 09:55 UTCJul 23, 11:04 UTC1h 9m
2026-07-23 DAL1175 LGA → ATL Jul 23, 03:20 UTCJul 23, 04:55 UTC1h 35m
2026-07-23 DAL1175 LGA → ATL Jul 23, 03:20 UTCJul 23, 04:49 UTC1h 29m
2026-07-22 DAL540 BOS → TPA Jul 22, 21:25 UTCJul 23, 01:20 UTC3h 55m
2026-07-22 DAL540 BOS → TPA Jul 22, 16:05 UTCJul 22, 19:50 UTC3h 45m
2026-07-22 DAL341 DEN → ATL Jul 22, 12:00 UTCJul 22, 14:20 UTC2h 20m
2026-07-22 DAL956 ALB → ATL Jul 22, 04:05 UTCJul 22, 05:25 UTC1h 20m
2026-07-22 DAL956 ALB → ATL Jul 22, 04:05 UTCJul 22, 06:42 UTC2h 37m
2026-07-22 DAL2397 EWR → ATL Jul 22, 00:20 UTCJul 22, 02:20 UTC2h 0m
2026-07-21 DAL2397 ATL → EWR Jul 21, 12:40 UTCJul 21, 14:20 UTC1h 40m
2026-07-21 DAL2375 - Jul 21, 09:25 UTCJul 21, 10:50 UTC1h 25m
2026-07-21 DAL1232 ATL → DTW Jul 21, 00:45 UTCJul 21, 02:15 UTC1h 30m
2026-07-20 DAL706 DEN → ATL Jul 20, 20:30 UTCJul 20, 23:10 UTC2h 40m
2026-07-20 DAL706 ATL → DEN Jul 20, 16:05 UTCJul 20, 18:35 UTC2h 30m
2026-07-20 DAL341 DEN → ATL Jul 20, 12:05 UTCJul 20, 14:30 UTC2h 25m
2026-07-20 DAL956 ALB → ATL Jul 20, 03:55 UTCJul 20, 06:20 UTC2h 25m
2026-07-20 DAL1026 MSP → ATL Jul 20, 00:10 UTCJul 20, 02:10 UTC2h 0m
2026-07-18 DAL2960 ATL → MSP Jul 18, 12:55 UTCJul 18, 15:00 UTC2h 5m
2026-07-18 DAL1460 - Jul 18, 10:10 UTCJul 18, 11:15 UTC1h 5m
2026-07-18 DAL1263 ORD → ATL Jul 18, 05:40 UTCJul 18, 06:50 UTC1h 10m
2026-07-18 DAL1465 - Jul 18, 01:20 UTCJul 18, 03:15 UTC1h 56m
2026-07-18 DAL1465 SAT → ATL Jul 18, 01:15 UTCJul 18, 03:10 UTC1h 55m
2026-07-17 DAL1465 - Jul 17, 21:50 UTCJul 17, 23:55 UTC2h 5m
2026-07-17 DAL994 LGA → ATL Jul 17, 17:09 UTCJul 17, 19:15 UTC2h 5m
2026-07-17 DAL994 LGA → ATL Jul 17, 17:09 UTCJul 17, 19:11 UTC2h 2m
2026-07-17 DAL557 ATL → LGA Jul 17, 13:50 UTCJul 17, 15:35 UTC1h 45m
2026-07-17 DAL1200 ROC → ATL Jul 17, 10:10 UTCJul 17, 11:45 UTC1h 35m
2026-07-17 DAL2472 ATL → ROC Jul 17, 01:55 UTCJul 17, 03:34 UTC1h 40m

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 N370DN page for operator, model, and routing details .

Mode-S A43423 frequently asked

What is Mode-S code A43423?
A43423 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N370DN.
Where is Mode-S A43423 registered?
Mode-S code A43423 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 A43423 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 A43423, octal 51032043, decimal 10,761,251.
What flights does A43423 operate?
Mode-S A43423 has broadcast 20 distinct callsigns, including DAL994, DAL2454, DAL431, DAL1455, DAL1349.