Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A21F0A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N236CP · BEECH 100 King Air · operated by REEVE AIR ALASKA LLC

Hex
A21F0A
Octal
50417412
Decimal
10,624,778
Country
US
Tail
N236CP
Type
BE10
No current signal · last broadcast 12d ago
Flights observed
130
Distinct callsigns
1
Country
US
Last broadcast
12d ago

Last known position

Most recent position reported by Mode-S A21F0A.

Country allocation

The ICAO 24-bit address A21F0A 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
RVV36 - 130 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-18 RVV36 - May 18, 04:20 UTCMay 18, 04:55 UTC35m
2026-05-18 RVV36 - May 18, 02:35 UTCMay 18, 03:45 UTC1h 10m
2026-05-18 RVV36 VDZ → FAI May 18, 01:10 UTCMay 18, 02:15 UTC1h 5m
2026-05-18 RVV36 - May 18, 00:05 UTCMay 18, 00:40 UTC35m
2026-05-12 RVV36 - May 12, 20:50 UTCMay 12, 21:55 UTC1h 5m
2026-05-12 RVV36 - May 12, 19:10 UTCMay 12, 20:01 UTC50m
2026-05-12 RVV36 - May 12, 17:45 UTCMay 12, 18:20 UTC35m
2026-05-12 RVV36 - May 12, 16:20 UTCMay 12, 16:55 UTC35m
2026-05-12 RVV36 - May 12, 15:01 UTCMay 12, 15:05 UTC5m
2026-05-12 RVV36 - May 12, 02:45 UTCMay 12, 03:30 UTC45m
2026-05-11 RVV36 VDZ → ANC May 11, 20:10 UTCMay 11, 20:55 UTC45m
2026-05-11 RVV36 - May 11, 18:50 UTCMay 11, 19:30 UTC40m
2026-05-11 RVV36 - May 11, 16:50 UTCMay 11, 17:25 UTC36m
2026-05-11 RVV36 - May 11, 15:40 UTCMay 11, 16:10 UTC30m
2026-05-10 RVV36 - May 10, 04:50 UTCMay 10, 05:34 UTC45m
2026-05-10 RVV36 - May 10, 03:04 UTCMay 10, 04:19 UTC1h 15m
2026-05-10 RVV36 VDZ → FAI May 10, 01:50 UTCMay 10, 02:50 UTC1h 0m
2026-05-10 RVV36 - May 10, 00:30 UTCMay 10, 01:04 UTC35m
2026-05-09 RVV36 - May 9, 20:20 UTCMay 9, 21:09 UTC50m
2026-05-09 RVV36 - May 9, 19:10 UTCMay 9, 19:45 UTC35m
2026-05-09 RVV36 - May 9, 17:20 UTCMay 9, 18:05 UTC45m
2026-05-09 RVV36 - May 9, 16:00 UTCMay 9, 16:40 UTC40m
2026-05-09 RVV36 ANC → ANC May 9, 02:45 UTCMay 9, 03:50 UTC1h 5m
2026-05-09 RVV36 - May 9, 01:30 UTCMay 9, 02:05 UTC35m
2026-05-08 RVV36 - May 8, 23:50 UTCMay 9, 00:55 UTC1h 5m
2026-05-08 RVV36 ENA → ENA May 8, 20:35 UTCMay 8, 20:55 UTC20m
2026-05-08 RVV36 - May 8, 18:25 UTCMay 8, 18:35 UTC10m
2026-05-08 RVV36 ENA → ENA May 8, 17:45 UTCMay 8, 17:50 UTC5m
2026-05-08 RVV36 ANC → ENA May 8, 16:05 UTCMay 8, 16:25 UTC20m
2026-05-08 RVV36 ENA → ANC May 8, 01:45 UTCMay 8, 02:09 UTC25m
2026-05-08 RVV36 ENA → ENA May 8, 00:34 UTCMay 8, 00:40 UTC5m
2026-05-07 RVV36 - May 7, 20:00 UTCMay 7, 20:30 UTC30m
2026-05-03 RVV36 ANC → PAQ May 3, 23:50 UTCMay 4, 00:10 UTC20m
2026-05-02 RVV36 - May 2, 21:15 UTCMay 2, 21:20 UTC5m
2026-05-02 RVV36 - May 2, 20:10 UTCMay 2, 21:05 UTC55m
2026-05-02 RVV36 - May 2, 19:05 UTCMay 2, 19:40 UTC35m
2026-05-02 RVV36 - May 2, 17:15 UTCMay 2, 17:55 UTC40m
2026-05-02 RVV36 - May 2, 16:00 UTCMay 2, 16:35 UTC35m
2026-05-01 RVV36 - May 1, 22:15 UTCMay 1, 22:25 UTC10m
2026-05-01 RVV36 - May 1, 17:35 UTCMay 1, 18:35 UTC1h 0m
2026-05-01 RVV36 - May 1, 16:20 UTCMay 1, 17:30 UTC1h 10m
2026-05-01 RVV36 - May 1, 15:25 UTCMay 1, 15:30 UTC5m
2026-05-01 RVV36 VDZ → ANC May 1, 03:50 UTCMay 1, 04:45 UTC55m
2026-05-01 RVV36 - May 1, 02:45 UTCMay 1, 03:10 UTC25m
2026-05-01 RVV36 - May 1, 01:20 UTCMay 1, 01:50 UTC30m
2026-04-30 RVV36 - Apr 30, 23:45 UTCMay 1, 01:00 UTC1h 15m
2026-04-30 RVV36 - Apr 30, 22:35 UTCApr 30, 23:10 UTC35m
2026-04-30 RVV36 - Apr 30, 20:30 UTCApr 30, 21:15 UTC45m
2026-04-30 RVV36 - Apr 30, 19:05 UTCApr 30, 19:35 UTC30m
2026-04-30 RVV36 - Apr 30, 18:50 UTCApr 30, 19:00 UTC10m

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 N236CP page for operator, model, and routing details .

Mode-S A21F0A frequently asked

What is Mode-S code A21F0A?
A21F0A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N236CP.
Where is Mode-S A21F0A registered?
Mode-S code A21F0A 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 A21F0A broadcasting right now?
No active broadcast right now. Last signal was 12d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21F0A, octal 50417412, decimal 10,624,778.
What flights does A21F0A operate?
Mode-S A21F0A has broadcast 1 distinct callsign, including RVV36.