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 16d ago
Flights observed
219
Distinct callsigns
20
Country
US
Last broadcast
16d 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
DAL1444 Delta Air Lines 10 2026-07-26
DAL3047 - 8 2026-07-16
DAL2168 Delta Air Lines 7 2026-07-26
DAL611 - 5 2026-07-07
DAL2529 - 5 2026-07-07
DAL2147 - 5 2026-07-22
DAL2135 - 5 2026-07-10
DAL1472 Delta Air Lines 5 2026-07-25
DAL1237 - 5 2026-07-12
DAL1023 Delta Air Lines 5 2026-07-22
DAL950 Delta Air Lines 4 2026-07-21
DAL2815 Delta Air Lines 4 2026-07-24
DAL2615 - 4 2026-07-10
DAL2381 Delta Air Lines 4 2026-07-21
DAL2064 Delta Air Lines 4 2026-07-22
DAL1940 - 4 2026-07-01
DAL1671 - 4 2026-07-03
DAL1279 - 4 2026-06-16
DAL1072 Delta Air Lines 4 2026-07-25
DAL1012 Delta Air Lines 4 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2168 LGA → ATL Jul 26, 19:50 UTCJul 26, 21:00 UTC1h 10m
2026-07-26 DAL1444 PHL → ATL Jul 26, 17:20 UTCJul 26, 18:40 UTC1h 20m
2026-07-26 DAL1444 PHL → ATL Jul 26, 14:35 UTCJul 26, 15:55 UTC1h 20m
2026-07-25 DAL1472 MSP → ATL Jul 25, 20:10 UTCJul 25, 21:55 UTC1h 45m
2026-07-25 DAL1472 MSP → ATL Jul 25, 17:10 UTCJul 25, 18:25 UTC1h 15m
2026-07-25 DAL1072 JFK → DEN Jul 25, 12:25 UTCJul 25, 13:55 UTC1h 30m
2026-07-25 DAL1072 JFK → DEN Jul 25, 12:20 UTCJul 25, 13:57 UTC1h 37m
2026-07-24 DAL2815 BNA → MSP Jul 24, 22:40 UTCJul 25, 00:00 UTC1h 20m
2026-07-24 DAL2815 BNA → MSP Jul 24, 22:35 UTCJul 25, 00:03 UTC1h 28m
2026-07-24 DAL8871 CZM → ATL Jul 24, 18:25 UTCJul 24, 20:30 UTC2h 5m
2026-07-24 DAL8871 CZM → ATL Jul 24, 18:21 UTCJul 24, 20:32 UTC2h 11m
2026-07-24 DAL8871 CZM → ATL Jul 24, 15:15 UTCJul 24, 17:20 UTC2h 5m
2026-07-22 DAL2168 LGA → ATL Jul 22, 23:50 UTCJul 23, 01:20 UTC1h 30m
2026-07-22 DAL2168 LGA → ATL Jul 22, 21:20 UTCJul 22, 22:40 UTC1h 20m
2026-07-22 DAL2147 - Jul 22, 17:40 UTCJul 22, 19:50 UTC2h 10m
2026-07-22 DAL2147 ATL → PVD Jul 22, 14:15 UTCJul 22, 16:20 UTC2h 5m
2026-07-22 DAL1023 ALB → ATL Jul 22, 11:10 UTCJul 22, 12:40 UTC1h 30m
2026-07-22 DAL2064 LGA → IAH Jul 22, 02:20 UTCJul 22, 04:30 UTC2h 10m
2026-07-21 DAL2381 STL → DTW Jul 21, 22:45 UTCJul 22, 00:25 UTC1h 40m
2026-07-21 DAL2381 STL → DTW Jul 21, 19:25 UTCJul 21, 20:55 UTC1h 30m
2026-07-21 2490 OKC → ATL Jul 21, 16:20 UTCJul 21, 18:00 UTC1h 40m
2026-07-21 DAL2490 LGA → RSW Jul 21, 13:20 UTCJul 21, 15:05 UTC1h 45m
2026-07-21 DAL950 ATL → SFO Jul 21, 00:20 UTCJul 21, 01:40 UTC1h 20m
2026-07-20 DAL950 ATL → SFO Jul 20, 20:55 UTCJul 20, 22:15 UTC1h 20m
2026-07-20 DAL2629 ATL → ILM Jul 20, 16:55 UTCJul 20, 19:05 UTC2h 10m
2026-07-20 DAL2597 ATL → YUL Jul 20, 13:20 UTCJul 20, 15:35 UTC2h 15m
2026-07-20 DAL2127 MSP → SLC Jul 20, 10:05 UTCJul 20, 11:15 UTC1h 10m
2026-07-20 DAL1309 SLC → STL Jul 20, 00:05 UTCJul 20, 01:25 UTC1h 20m
2026-07-19 DAL1158 OKC → ATL Jul 19, 20:35 UTCJul 19, 22:45 UTC2h 10m
2026-07-19 DAL1158 OKC → ATL Jul 19, 20:31 UTCJul 19, 22:42 UTC2h 11m
2026-07-19 DAL2784 ATL → OKC Jul 19, 01:50 UTCJul 19, 03:25 UTC1h 35m
2026-07-19 DAL2784 ATL → OKC Jul 19, 01:47 UTCJul 19, 03:22 UTC1h 35m
2026-07-18 DAL775 TPA → LAX Jul 18, 18:45 UTCJul 18, 20:20 UTC1h 35m
2026-07-18 DAL775 TPA → LAX Jul 18, 16:05 UTCJul 18, 17:25 UTC1h 20m
2026-07-18 DAL1157 - Jul 18, 12:55 UTCJul 18, 14:45 UTC1h 50m
2026-07-18 DAL2707 LGA → ATL Jul 18, 01:50 UTCJul 18, 03:40 UTC1h 51m
2026-07-17 DAL360 DCA → ATL Jul 17, 22:20 UTCJul 17, 23:39 UTC1h 20m
2026-07-17 DAL360 ATL → DCA Jul 17, 17:30 UTCJul 17, 19:00 UTC1h 30m
2026-07-17 DAL1324 IAD → ATL Jul 17, 14:24 UTCJul 17, 15:40 UTC1h 15m
2026-07-17 DAL1324 ATL → IAD Jul 17, 11:55 UTCJul 17, 13:10 UTC1h 15m
2026-07-16 DAL2381 - Jul 16, 22:25 UTCJul 17, 00:10 UTC1h 45m
2026-07-16 DAL2381 - Jul 16, 19:25 UTCJul 16, 21:00 UTC1h 35m
2026-07-16 DAL3047 - Jul 16, 16:40 UTCJul 16, 17:25 UTC45m
2026-07-16 DAL3047 MYR → ATL Jul 16, 16:35 UTCJul 16, 17:20 UTC45m
2026-07-16 DAL3047 - Jul 16, 13:40 UTCJul 16, 14:25 UTC45m
2026-07-16 DAL1023 - Jul 16, 10:10 UTCJul 16, 12:09 UTC2h 0m
2026-07-16 DAL1023 PVD → ATL Jul 16, 10:05 UTCJul 16, 12:06 UTC2h 1m
2026-07-15 DAL2659 ATL → PVD Jul 15, 22:00 UTCJul 16, 00:05 UTC2h 5m
2026-07-15 DAL1472 - Jul 15, 18:30 UTCJul 15, 20:00 UTC1h 30m
2026-07-15 DAL1472 EYW → ATL Jul 15, 18:25 UTCJul 15, 20:00 UTC1h 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 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 16d 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 DAL1444, DAL3047, DAL2168, DAL611, DAL2529.