Apparatus

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sensors Mode-S transponder

A21DFC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2354E · CESSNA 172 Skyhawk · operated by A&N FLIGHT SCHOOL INC

Hex
A21DFC
Octal
50416774
Decimal
10,624,508
Country
US
Tail
N2354E
Type
C172
No current signal · last broadcast 16d ago
Flights observed
317
Distinct callsigns
1
Country
US
Last broadcast
16d ago

Last known position

Most recent position reported by Mode-S A21DFC.

Country allocation

The ICAO 24-bit address A21DFC 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
N2354E - 317 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N2354E TMB → TMB Jul 26, 13:10 UTCJul 26, 14:00 UTC50m
2026-07-25 N2354E TMB → TMB Jul 25, 15:35 UTCJul 25, 16:00 UTC25m
2026-07-25 N2354E TMB → TMB Jul 25, 13:35 UTCJul 25, 14:25 UTC50m
2026-07-24 N2354E - Jul 24, 01:35 UTCJul 24, 03:25 UTC1h 50m
2026-07-23 N2354E - Jul 23, 23:45 UTCJul 24, 00:30 UTC45m
2026-07-23 N2354E - Jul 23, 22:40 UTCJul 23, 23:15 UTC35m
2026-07-23 N2354E TMB → TMB Jul 23, 17:15 UTCJul 23, 18:10 UTC55m
2026-07-23 N2354E TMB → TMB Jul 23, 16:10 UTCJul 23, 16:20 UTC10m
2026-07-23 N2354E - Jul 23, 15:25 UTCJul 23, 15:40 UTC15m
2026-07-23 N2354E TMB → TMB Jul 23, 13:30 UTCJul 23, 14:20 UTC50m
2026-07-23 N2354E TMB → TMB Jul 23, 11:20 UTCJul 23, 12:30 UTC1h 10m
2026-07-22 N2354E TMB → TMB Jul 22, 17:20 UTCJul 22, 18:20 UTC1h 0m
2026-07-22 N2354E TMB → TMB Jul 22, 15:25 UTCJul 22, 16:25 UTC1h 0m
2026-07-22 N2354E - Jul 22, 14:10 UTCJul 22, 14:20 UTC10m
2026-07-22 N2354E - Jul 22, 13:45 UTCJul 22, 13:55 UTC10m
2026-07-22 N2354E TMB → TMB Jul 22, 13:10 UTCJul 22, 13:20 UTC10m
2026-07-22 N2354E - Jul 22, 11:35 UTCJul 22, 12:15 UTC40m
2026-07-21 N2354E - Jul 21, 15:15 UTCJul 21, 16:10 UTC55m
2026-07-21 N2354E TMB → TMB Jul 21, 13:05 UTCJul 21, 13:50 UTC45m
2026-07-21 N2354E - Jul 21, 11:40 UTCJul 21, 12:05 UTC25m
2026-07-21 N2354E TMB → TMB Jul 21, 11:05 UTCJul 21, 11:25 UTC20m
2026-07-21 N2354E - Jul 21, 01:35 UTCJul 21, 03:35 UTC2h 0m
2026-07-20 N2354E - Jul 20, 23:05 UTCJul 21, 00:30 UTC1h 24m
2026-07-20 N2354E - Jul 20, 21:10 UTCJul 20, 22:05 UTC55m
2026-07-12 N2354E - Jul 12, 22:35 UTCJul 13, 00:05 UTC1h 30m
2026-07-12 N2354E - Jul 12, 12:40 UTCJul 12, 14:55 UTC2h 15m
2026-07-11 N2354E - Jul 11, 20:15 UTCJul 11, 21:25 UTC1h 10m
2026-07-11 N2354E - Jul 11, 17:55 UTCJul 11, 19:40 UTC1h 45m
2026-07-11 N2354E - Jul 11, 15:40 UTCJul 11, 16:00 UTC20m
2026-07-11 N2354E - Jul 11, 14:20 UTCJul 11, 14:55 UTC35m
2026-07-10 N2354E - Jul 10, 11:25 UTCJul 10, 12:25 UTC1h 0m
2026-07-09 N2354E TMB → TMB Jul 9, 23:25 UTCJul 10, 02:40 UTC3h 15m
2026-07-09 N2354E - Jul 9, 15:15 UTCJul 9, 15:40 UTC25m
2026-07-09 N2354E - Jul 9, 13:35 UTCJul 9, 14:20 UTC45m
2026-07-09 N2354E TMB → TMB Jul 9, 11:35 UTCJul 9, 12:25 UTC50m
2026-07-08 N2354E - Jul 8, 23:35 UTCJul 9, 02:35 UTC3h 0m
2026-07-08 N2354E - Jul 8, 19:15 UTCJul 8, 20:15 UTC1h 0m
2026-07-08 N2354E - Jul 8, 17:00 UTCJul 8, 17:55 UTC55m
2026-07-08 N2354E TMB → TMB Jul 8, 15:20 UTCJul 8, 16:05 UTC45m
2026-07-08 N2354E - Jul 8, 13:10 UTCJul 8, 14:00 UTC50m
2026-07-08 N2354E - Jul 8, 11:25 UTCJul 8, 12:15 UTC50m
2026-07-07 N2354E - Jul 7, 17:15 UTCJul 7, 17:50 UTC35m
2026-07-07 N2354E TMB → TMB Jul 7, 15:10 UTCJul 7, 16:20 UTC1h 10m
2026-07-07 N2354E - Jul 7, 12:45 UTCJul 7, 14:10 UTC1h 25m
2026-07-07 N2354E TMB → TMB Jul 7, 09:35 UTCJul 7, 11:45 UTC2h 10m
2026-07-06 N2354E TMB → TMB Jul 6, 16:55 UTCJul 6, 17:05 UTC10m
2026-07-06 N2354E TMB → TMB Jul 6, 13:20 UTCJul 6, 14:15 UTC55m
2026-07-06 N2354E TMB → TMB Jul 6, 11:20 UTCJul 6, 12:15 UTC55m
2026-07-04 N2354E TMB → TMB Jul 4, 11:45 UTCJul 4, 14:15 UTC2h 30m
2026-07-04 N2354E - Jul 4, 02:15 UTCJul 4, 02:45 UTC30m

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 N2354E page for operator, model, and routing details .

Mode-S A21DFC frequently asked

What is Mode-S code A21DFC?
A21DFC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2354E.
Where is Mode-S A21DFC registered?
Mode-S code A21DFC 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 A21DFC 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 A21DFC, octal 50416774, decimal 10,624,508.
What flights does A21DFC operate?
Mode-S A21DFC has broadcast 1 distinct callsign, including N2354E.