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sensors Mode-S transponder

A1B368

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20891 · CESSNA 172 Skyhawk · operated by MORRISTOWN FLYING SERVICE INC

Hex
A1B368
Octal
50331550
Decimal
10,597,224
Country
US
Tail
N20891
Type
C172
No current signal · last broadcast Jul 24, 20:50 UTC
Flights observed
70
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 20:50 UTC

Last known position

Most recent position reported by Mode-S A1B368.

Country allocation

The ICAO 24-bit address A1B368 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
N20891 - 70 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N20891 - Jul 24, 20:15 UTCJul 24, 20:50 UTC35m
2026-07-21 N20891 - Jul 21, 14:00 UTCJul 21, 14:10 UTC10m
2026-07-17 N20891 - Jul 17, 19:40 UTCJul 17, 20:04 UTC25m
2026-07-17 N20891 - Jul 17, 14:55 UTCJul 17, 15:49 UTC55m
2026-07-17 N20891 - Jul 17, 12:35 UTCJul 17, 12:50 UTC15m
2026-07-16 N20891 - Jul 16, 20:39 UTCJul 16, 20:55 UTC15m
2026-07-16 N20891 - Jul 16, 16:05 UTCJul 16, 16:25 UTC20m
2026-07-14 N20891 - Jul 14, 20:05 UTCJul 14, 21:30 UTC1h 25m
2026-07-14 N20891 - Jul 14, 19:20 UTCJul 14, 19:35 UTC15m
2026-07-14 N20891 - Jul 14, 16:25 UTCJul 14, 16:45 UTC20m
2026-07-14 N20891 - Jul 14, 15:05 UTCJul 14, 15:15 UTC10m
2026-07-14 N20891 - Jul 14, 14:15 UTCJul 14, 14:25 UTC10m
2026-07-10 N20891 - Jul 10, 17:40 UTCJul 10, 18:20 UTC40m
2026-07-09 N20891 - Jul 9, 18:40 UTCJul 9, 19:30 UTC50m
2026-07-09 N20891 - Jul 9, 17:00 UTCJul 9, 17:30 UTC30m
2026-07-08 N20891 - Jul 8, 19:20 UTCJul 8, 19:45 UTC25m
2026-07-08 N20891 - Jul 8, 16:55 UTCJul 8, 17:45 UTC50m
2026-07-06 N20891 - Jul 6, 17:00 UTCJul 6, 17:10 UTC10m
2026-07-02 N20891 - Jul 2, 11:55 UTCJul 2, 12:05 UTC10m
2026-07-01 N20891 - Jul 1, 14:05 UTCJul 1, 14:25 UTC20m
2026-06-30 N20891 - Jun 30, 13:55 UTCJun 30, 14:10 UTC15m
2026-06-29 N20891 - Jun 29, 17:05 UTCJun 29, 17:19 UTC15m
2026-06-29 N20891 - Jun 29, 13:49 UTCJun 29, 14:19 UTC30m
2026-06-26 N20891 - Jun 26, 13:55 UTCJun 26, 14:05 UTC10m
2026-06-26 N20891 - Jun 26, 12:59 UTCJun 26, 13:10 UTC10m
2026-06-24 N20891 - Jun 24, 16:29 UTCJun 24, 17:05 UTC35m
2026-06-24 N20891 - Jun 24, 14:39 UTCJun 24, 15:05 UTC25m
2026-06-24 N20891 - Jun 24, 13:50 UTCJun 24, 14:00 UTC10m
2026-06-20 N20891 - Jun 20, 15:19 UTCJun 20, 15:49 UTC30m
2026-06-19 N20891 - Jun 19, 17:29 UTCJun 19, 18:20 UTC50m
2026-06-17 N20891 - Jun 17, 21:10 UTCJun 17, 21:35 UTC25m
2026-06-17 N20891 - Jun 17, 19:50 UTCJun 17, 20:30 UTC40m
2026-06-16 N20891 - Jun 16, 23:05 UTCJun 16, 23:30 UTC25m
2026-06-16 N20891 - Jun 16, 14:09 UTCJun 16, 14:39 UTC30m
2026-06-15 N20891 - Jun 15, 17:34 UTCJun 15, 18:10 UTC35m
2026-06-15 N20891 - Jun 15, 16:55 UTCJun 15, 17:04 UTC10m
2026-06-10 N20891 - Jun 10, 16:10 UTCJun 10, 16:30 UTC20m
2026-06-10 N20891 - Jun 10, 14:05 UTCJun 10, 14:45 UTC40m
2026-06-05 N20891 - Jun 5, 13:45 UTCJun 5, 14:05 UTC20m
2026-06-04 N20891 - Jun 4, 21:05 UTCJun 4, 21:20 UTC15m
2026-06-03 N20891 - Jun 3, 12:50 UTCJun 3, 13:10 UTC20m
2026-06-02 N20891 - Jun 2, 17:20 UTCJun 2, 17:30 UTC10m
2026-06-02 N20891 - Jun 2, 13:40 UTCJun 2, 13:50 UTC10m
2026-06-01 N20891 - Jun 1, 17:00 UTCJun 1, 17:25 UTC25m
2026-06-01 N20891 - Jun 1, 16:05 UTCJun 1, 16:30 UTC25m
2026-05-29 N20891 - May 29, 15:20 UTCMay 29, 16:00 UTC40m
2026-05-29 N20891 - May 29, 13:50 UTCMay 29, 14:20 UTC30m
2026-05-28 N20891 - May 28, 20:50 UTCMay 28, 21:55 UTC1h 5m
2026-05-27 N20891 - May 27, 19:05 UTCMay 27, 19:55 UTC50m
2026-05-26 N20891 - May 26, 22:05 UTCMay 26, 23:10 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 N20891 page for operator, model, and routing details .

Mode-S A1B368 frequently asked

What is Mode-S code A1B368?
A1B368 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20891.
Where is Mode-S A1B368 registered?
Mode-S code A1B368 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 A1B368 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1B368, octal 50331550, decimal 10,597,224.
What flights does A1B368 operate?
Mode-S A1B368 has broadcast 1 distinct callsign, including N20891.