Apparatus

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sensors Mode-S transponder

A423C4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N366NB · AIRBUS A-319 · operated by DELTA AIR LINES INC

Hex
A423C4
Octal
51021704
Decimal
10,757,060
Country
US
Tail
N366NB
Type
A319
No current signal · last broadcast 5h ago
Flights observed
57
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A423C4.

Country allocation

The ICAO 24-bit address A423C4 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
DAL1279 - 4 2026-06-16
DAL611 - 3 2026-06-19
DAL2816 Delta Air Lines 3 2026-06-14
DAL1018 - 3 2026-06-16
DAL9937 Delta Air Lines 2 2026-06-10
DAL817 - 2 2026-06-16
DAL788 - 2 2026-06-23
DAL622 - 2 2026-06-24
DAL2646 - 2 2026-06-16
DAL2529 - 2 2026-06-18
DAL2517 - 2 2026-06-13
DAL2358 Delta Air Lines 2 2026-06-18
DAL2148 - 2 2026-06-24
DAL2066 Delta Air Lines 2 2026-06-14
DAL2057 Delta Air Lines 2 2026-06-20
DAL1275 - 2 2026-06-17
DAL1054 Delta Air Lines 2 2026-06-17
DAL1038 - 2 2026-06-16
DAL1022 Delta Air Lines 2 2026-06-14
DAL605 - 1 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-24 DAL622 - Jun 24, 23:00 UTCJun 25, 01:35 UTC2h 35m
2026-06-24 DAL622 LAX → AUS Jun 24, 22:57 UTCJun 25, 01:35 UTC2h 38m
2026-06-24 DAL2148 DEN → LAX Jun 24, 18:55 UTCJun 24, 20:54 UTC2h 0m
2026-06-24 DAL2148 - Jun 24, 15:14 UTCJun 24, 17:05 UTC1h 50m
2026-06-24 DAL1584 AUS → ATL Jun 24, 01:25 UTCJun 24, 04:11 UTC2h 46m
2026-06-23 DAL1612 - Jun 23, 20:54 UTCJun 23, 23:29 UTC2h 35m
2026-06-23 DAL788 - Jun 23, 16:50 UTCJun 23, 19:29 UTC2h 40m
2026-06-23 DAL788 - Jun 23, 12:40 UTCJun 23, 15:30 UTC2h 50m
2026-06-23 DAL2091 - Jun 23, 10:24 UTCJun 23, 11:24 UTC1h 0m
2026-06-23 DAL2097 - Jun 23, 03:04 UTCJun 23, 04:45 UTC1h 40m
2026-06-20 DAL2057 DTW → MYR Jun 20, 17:49 UTCJun 20, 19:29 UTC1h 40m
2026-06-20 DAL2057 DTW → MYR Jun 20, 15:04 UTCJun 20, 16:29 UTC1h 25m
2026-06-19 DAL605 - Jun 19, 20:29 UTCJun 20, 00:39 UTC4h 10m
2026-06-19 DAL611 - Jun 19, 18:39 UTCJun 19, 18:49 UTC10m
2026-06-19 DAL611 - Jun 19, 14:54 UTCJun 19, 17:59 UTC3h 5m
2026-06-19 DAL611 MSP → MEX Jun 19, 14:50 UTCJun 19, 18:54 UTC4h 4m
2026-06-19 DAL1193 DCA → MSP Jun 19, 10:19 UTCJun 19, 12:39 UTC2h 20m
2026-06-19 DAL2729 MCO → DCA Jun 19, 01:45 UTCJun 19, 03:34 UTC1h 50m
2026-06-18 DAL2529 AUS → MCO Jun 18, 21:18 UTCJun 18, 23:33 UTC2h 15m
2026-06-18 DAL2529 AUS → MCO Jun 18, 21:20 UTCJun 18, 23:30 UTC2h 10m
2026-06-18 DAL1012 FLL → LGA Jun 18, 17:00 UTCJun 18, 19:40 UTC2h 40m
2026-06-18 DAL2358 RSW → BOS Jun 18, 01:20 UTCJun 18, 02:05 UTC45m
2026-06-17 DAL2358 RSW → BOS Jun 17, 23:10 UTCJun 18, 00:00 UTC50m
2026-06-17 DAL2265 - Jun 17, 17:15 UTCJun 17, 18:30 UTC1h 15m
2026-06-17 DAL2118 BOS → RDU Jun 17, 14:20 UTCJun 17, 15:55 UTC1h 35m
2026-06-17 DAL1054 ALB → ATL Jun 17, 11:20 UTCJun 17, 12:50 UTC1h 30m
2026-06-17 DAL1275 - Jun 17, 01:00 UTCJun 17, 02:25 UTC1h 25m
2026-06-16 DAL1275 - Jun 16, 22:10 UTCJun 16, 23:40 UTC1h 30m
2026-06-16 DAL1018 - Jun 16, 19:19 UTCJun 16, 20:55 UTC1h 36m
2026-06-16 DAL1018 FLL → RDU Jun 16, 19:15 UTCJun 16, 20:52 UTC1h 37m
2026-06-16 DAL1038 RDU → FLL Jun 16, 16:10 UTCJun 16, 17:55 UTC1h 45m
2026-06-16 DAL1279 TPA → RDU Jun 16, 13:15 UTCJun 16, 14:39 UTC1h 25m
2026-06-16 DAL1279 - Jun 16, 10:40 UTCJun 16, 12:10 UTC1h 30m
2026-06-16 DAL817 BOS → RDU Jun 16, 05:34 UTCJun 16, 07:05 UTC1h 30m
2026-06-16 DAL2646 - Jun 16, 02:29 UTCJun 16, 04:15 UTC1h 45m
2026-06-15 DAL2646 - Jun 15, 20:59 UTCJun 15, 23:09 UTC2h 10m
2026-06-15 DAL1033 - Jun 15, 17:54 UTCJun 15, 19:20 UTC1h 25m
2026-06-15 DAL1279 TPA → RDU Jun 15, 13:20 UTCJun 15, 14:50 UTC1h 30m
2026-06-15 DAL1279 RDU → TPA Jun 15, 10:40 UTCJun 15, 12:15 UTC1h 35m
2026-06-15 DAL817 BOS → RDU Jun 15, 03:40 UTCJun 15, 05:15 UTC1h 35m
2026-06-14 DAL2816 ATL → BNA Jun 14, 22:20 UTCJun 15, 00:20 UTC2h 0m
2026-06-14 DAL2816 ATL → BNA Jun 14, 22:19 UTCJun 15, 00:14 UTC1h 55m
2026-06-14 DAL2816 ATL → BNA Jun 14, 17:40 UTCJun 14, 20:40 UTC3h 0m
2026-06-14 DAL1022 ATL → DTW Jun 14, 14:50 UTCJun 14, 16:25 UTC1h 35m
2026-06-14 DAL1022 ATL → DTW Jun 14, 14:48 UTCJun 14, 16:24 UTC1h 36m
2026-06-14 DAL2066 BOS → RDU Jun 14, 11:30 UTCJun 14, 13:00 UTC1h 30m
2026-06-14 DAL2066 BOS → RDU Jun 14, 11:30 UTCJun 14, 13:00 UTC1h 30m
2026-06-13 DAL2517 - Jun 13, 18:15 UTCJun 13, 20:35 UTC2h 20m
2026-06-13 DAL2517 - Jun 13, 14:15 UTCJun 13, 16:25 UTC2h 10m
2026-06-13 DAL1054 ALB → ATL Jun 13, 11:15 UTCJun 13, 12:35 UTC1h 20m

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 N366NB page for operator, model, and routing details .

Mode-S A423C4 frequently asked

What is Mode-S code A423C4?
A423C4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N366NB.
Where is Mode-S A423C4 registered?
Mode-S code A423C4 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 A423C4 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A423C4, octal 51021704, decimal 10,757,060.
What flights does A423C4 operate?
Mode-S A423C4 has broadcast 20 distinct callsigns, including DAL1279, DAL611, DAL2816, DAL1018, DAL9937.