Apparatus

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sensors Mode-S transponder

A23ECF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2439Z · CESSNA 172 Skyhawk · operated by PLANE NONSENSE INC

Hex
A23ECF
Octal
50437317
Decimal
10,632,911
Country
US
Tail
N2439Z
Type
C172
No current signal · last broadcast 4d ago
Flights observed
101
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A23ECF.

Country allocation

The ICAO 24-bit address A23ECF 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 1 distinct

Callsign Airline Flights Last seen
N2439Z - 101 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N2439Z - Jul 26, 21:10 UTCJul 26, 21:45 UTC35m
2026-07-26 N2439Z BED → BED Jul 26, 16:30 UTCJul 26, 17:20 UTC50m
2026-07-25 N2439Z LEB → BED Jul 25, 15:25 UTCJul 25, 16:15 UTC50m
2026-07-25 N2439Z - Jul 25, 14:00 UTCJul 25, 14:50 UTC50m
2026-07-25 N2439Z HPN → BED Jul 25, 01:50 UTCJul 25, 03:25 UTC1h 35m
2026-07-24 N2439Z - Jul 24, 22:20 UTCJul 25, 00:30 UTC2h 10m
2026-07-24 N2439Z - Jul 24, 18:55 UTCJul 24, 19:40 UTC45m
2026-07-24 N2439Z - Jul 24, 14:50 UTCJul 24, 15:45 UTC55m
2026-07-24 N2439Z - Jul 24, 11:50 UTCJul 24, 13:55 UTC2h 5m
2026-07-24 N2439Z - Jul 24, 02:00 UTCJul 24, 03:25 UTC1h 25m
2026-07-23 N2439Z - Jul 23, 22:10 UTCJul 24, 00:30 UTC2h 20m
2026-07-23 N2439Z BED → BED Jul 23, 14:50 UTCJul 23, 16:50 UTC2h 0m
2026-07-23 N2439Z BED → BED Jul 23, 01:00 UTCJul 23, 02:55 UTC1h 55m
2026-07-22 N2439Z - Jul 22, 17:05 UTCJul 22, 18:00 UTC55m
2026-07-22 N2439Z - Jul 22, 15:35 UTCJul 22, 16:50 UTC1h 15m
2026-07-21 N2439Z - Jul 21, 00:55 UTCJul 21, 01:35 UTC40m
2026-07-20 N2439Z BED → MVY Jul 20, 23:35 UTCJul 21, 00:20 UTC45m
2026-07-19 N2439Z BED → BED Jul 19, 20:50 UTCJul 19, 21:40 UTC50m
2026-07-18 N2439Z BED → BED Jul 18, 15:05 UTCJul 18, 16:30 UTC1h 25m
2026-07-16 N2439Z - Jul 16, 15:14 UTCJul 16, 16:40 UTC1h 25m
2026-07-14 N2439Z BED → BED Jul 14, 22:50 UTCJul 14, 23:55 UTC1h 5m
2026-07-14 N2439Z - Jul 14, 18:50 UTCJul 14, 19:50 UTC1h 0m
2026-07-09 N2439Z BED → BED Jul 9, 21:05 UTCJul 9, 21:55 UTC50m
2026-07-05 N2439Z BED → BED Jul 5, 14:35 UTCJul 5, 15:50 UTC1h 15m
2026-07-03 N2439Z BED → BED Jul 3, 12:55 UTCJul 3, 14:05 UTC1h 10m
2026-07-02 N2439Z - Jul 2, 13:50 UTCJul 2, 16:05 UTC2h 15m
2026-07-02 N2439Z - Jul 2, 11:50 UTCJul 2, 12:45 UTC55m
2026-07-01 N2439Z - Jul 1, 15:50 UTCJul 1, 16:30 UTC40m
2026-07-01 N2439Z - Jul 1, 13:55 UTCJul 1, 14:45 UTC50m
2026-06-30 N2439Z - Jun 30, 16:50 UTCJun 30, 18:30 UTC1h 40m
2026-06-30 N2439Z - Jun 30, 14:55 UTCJun 30, 15:40 UTC45m
2026-06-29 N2439Z BED → BED Jun 29, 22:55 UTCJun 30, 02:45 UTC3h 51m
2026-06-29 N2439Z BED → BED Jun 29, 18:49 UTCJun 29, 20:35 UTC1h 45m
2026-06-29 N2439Z - Jun 29, 12:20 UTCJun 29, 12:39 UTC20m
2026-06-28 N2439Z - Jun 28, 18:25 UTCJun 28, 19:14 UTC50m
2026-06-28 N2439Z - Jun 28, 16:49 UTCJun 28, 17:10 UTC20m
2026-06-28 N2439Z - Jun 28, 13:29 UTCJun 28, 14:39 UTC1h 10m
2026-06-27 N2439Z - Jun 27, 19:39 UTCJun 27, 20:24 UTC45m
2026-06-27 N2439Z - Jun 27, 15:10 UTCJun 27, 15:55 UTC45m
2026-06-26 N2439Z - Jun 26, 14:39 UTCJun 26, 17:09 UTC2h 30m
2026-06-26 N2439Z BED → BED Jun 26, 11:45 UTCJun 26, 13:19 UTC1h 35m
2026-06-25 N2439Z BED → BED Jun 25, 20:45 UTCJun 25, 22:04 UTC1h 20m
2026-06-25 N2439Z - Jun 25, 17:30 UTCJun 25, 18:24 UTC55m
2026-06-25 N2439Z - Jun 25, 11:50 UTCJun 25, 12:25 UTC35m
2026-06-24 N2439Z BED → BED Jun 24, 16:19 UTCJun 24, 17:10 UTC50m
2026-06-24 N2439Z - Jun 24, 14:34 UTCJun 24, 15:09 UTC35m
2026-06-24 N2439Z - Jun 24, 12:34 UTCJun 24, 13:34 UTC1h 0m
2026-06-23 N2439Z - Jun 23, 19:24 UTCJun 23, 20:40 UTC1h 15m
2026-06-23 N2439Z - Jun 23, 14:19 UTCJun 23, 15:19 UTC1h 0m
2026-06-22 N2439Z WSH → BED Jun 22, 00:14 UTCJun 22, 01:19 UTC1h 5m

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 N2439Z page for operator, model, and routing details .

Mode-S A23ECF frequently asked

What is Mode-S code A23ECF?
A23ECF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2439Z.
Where is Mode-S A23ECF registered?
Mode-S code A23ECF 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 A23ECF broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23ECF, octal 50437317, decimal 10,632,911.
What flights does A23ECF operate?
Mode-S A23ECF has broadcast 1 distinct callsign, including N2439Z.