sensors Mode-S transponder

A21FE4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N236MG · operated by PIPER AIRCRAFT INC

Hex
A21FE4
Octal
50417744
Decimal
10,624,996
Country
US
Tail
N236MG
No current signal · last broadcast 8h ago
Flights observed
77
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A21FE4.

Country allocation

The ICAO 24-bit address A21FE4 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
NIT236 - 77 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 NIT236 - May 29, 16:35 UTCMay 29, 17:35 UTC1h 0m
2026-05-28 NIT236 - May 28, 20:20 UTCMay 28, 21:30 UTC1h 10m
2026-05-28 NIT236 - May 28, 16:30 UTCMay 28, 17:10 UTC40m
2026-05-28 NIT236 - May 28, 14:35 UTCMay 28, 15:20 UTC45m
2026-05-27 NIT236 - May 27, 20:40 UTCMay 27, 21:15 UTC35m
2026-05-26 NIT236 - May 26, 18:50 UTCMay 26, 19:30 UTC40m
2026-05-26 NIT236 - May 26, 17:15 UTCMay 26, 17:50 UTC35m
2026-05-22 NIT236 - May 22, 17:20 UTCMay 22, 17:35 UTC15m
2026-05-22 NIT236 - May 22, 16:35 UTCMay 22, 16:50 UTC15m
2026-05-21 NIT236 - May 21, 13:01 UTCMay 21, 13:50 UTC50m
2026-05-20 NIT236 - May 20, 20:55 UTCMay 20, 21:50 UTC55m
2026-05-19 NIT236 - May 19, 17:35 UTCMay 19, 18:35 UTC1h 0m
2026-05-18 NIT236 - May 18, 18:10 UTCMay 18, 18:25 UTC15m
2026-05-18 NIT236 - May 18, 16:25 UTCMay 18, 16:55 UTC30m
2026-05-18 NIT236 - May 18, 15:00 UTCMay 18, 15:15 UTC15m
2026-05-17 NIT236 - May 17, 18:10 UTCMay 17, 18:20 UTC10m
2026-05-17 NIT236 - May 17, 16:30 UTCMay 17, 17:15 UTC45m
2026-05-16 NIT236 - May 16, 14:46 UTCMay 16, 15:16 UTC30m
2026-05-15 NIT236 - May 15, 16:15 UTCMay 15, 17:10 UTC55m
2026-05-15 NIT236 - May 15, 14:20 UTCMay 15, 15:10 UTC49m
2026-05-13 NIT236 - May 13, 12:30 UTCMay 13, 13:10 UTC40m
2026-05-11 NIT236 - May 11, 16:20 UTCMay 11, 17:00 UTC41m
2026-05-10 NIT236 - May 10, 17:49 UTCMay 10, 18:15 UTC25m
2026-05-04 NIT236 - May 4, 11:55 UTCMay 4, 12:40 UTC45m
2026-05-03 NIT236 - May 3, 17:00 UTCMay 3, 17:29 UTC30m
2026-05-03 NIT236 - May 3, 12:30 UTCMay 3, 13:20 UTC50m
2026-05-01 NIT236 - May 1, 16:40 UTCMay 1, 17:25 UTC45m
2026-05-01 NIT236 - May 1, 14:30 UTCMay 1, 15:35 UTC1h 5m
2026-04-30 NIT236 - Apr 30, 14:15 UTCApr 30, 14:25 UTC10m
2026-04-27 NIT236 - Apr 27, 22:45 UTCApr 28, 01:35 UTC2h 50m
2026-04-27 NIT236 - Apr 27, 15:15 UTCApr 27, 16:10 UTC55m
2026-04-26 NIT236 - Apr 26, 16:15 UTCApr 26, 16:50 UTC35m
2026-04-25 NIT236 - Apr 25, 18:35 UTCApr 25, 18:55 UTC20m
2026-04-25 NIT236 - Apr 25, 14:40 UTCApr 25, 15:35 UTC55m
2026-04-24 NIT236 - Apr 24, 14:45 UTCApr 24, 14:55 UTC10m
2026-04-24 NIT236 - Apr 24, 12:25 UTCApr 24, 13:30 UTC1h 5m
2026-04-23 NIT236 - Apr 23, 18:35 UTCApr 23, 19:20 UTC45m
2026-04-23 NIT236 - Apr 23, 14:20 UTCApr 23, 14:45 UTC25m
2026-04-22 NIT236 - Apr 22, 22:20 UTCApr 22, 22:40 UTC20m
2026-04-22 NIT236 - Apr 22, 20:25 UTCApr 22, 20:45 UTC20m
2026-04-22 NIT236 - Apr 22, 18:45 UTCApr 22, 19:10 UTC25m
2026-04-22 NIT236 - Apr 22, 15:30 UTCApr 22, 16:05 UTC35m
2026-04-21 NIT236 - Apr 21, 18:10 UTCApr 21, 18:55 UTC45m
2026-04-21 NIT236 - Apr 21, 16:35 UTCApr 21, 17:15 UTC40m
2026-04-21 NIT236 - Apr 21, 13:45 UTCApr 21, 14:31 UTC45m
2026-04-21 NIT236 - Apr 21, 12:25 UTCApr 21, 13:01 UTC35m
2026-04-20 NIT236 - Apr 20, 20:25 UTCApr 20, 20:40 UTC15m
2026-04-20 NIT236 - Apr 20, 17:35 UTCApr 20, 18:15 UTC40m
2026-04-20 NIT236 - Apr 20, 12:00 UTCApr 20, 12:10 UTC10m
2026-04-18 NIT236 - Apr 18, 16:40 UTCApr 18, 17:00 UTC20m

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 N236MG page for operator, model, and routing details .

Mode-S A21FE4 frequently asked

What is Mode-S code A21FE4?
A21FE4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N236MG.
Where is Mode-S A21FE4 registered?
Mode-S code A21FE4 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 A21FE4 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21FE4, octal 50417744, decimal 10,624,996.
What flights does A21FE4 operate?
Mode-S A21FE4 has broadcast 1 distinct callsign, including NIT236.