Apparatus

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sensors Mode-S transponder

A39B03

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N331RF · CESSNA 208 Caravan · operated by RANDIGO LLC

Hex
A39B03
Octal
50715403
Decimal
10,722,051
Country
US
Tail
N331RF
Type
C208
No current signal · last broadcast 1d ago
Flights observed
69
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A39B03.

Country allocation

The ICAO 24-bit address A39B03 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
N331RF - 69 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N331RF - Jul 24, 18:30 UTCJul 24, 20:35 UTC2h 5m
2026-07-12 N331RF - Jul 12, 21:50 UTCJul 12, 22:30 UTC40m
2026-07-12 N331RF - Jul 12, 19:55 UTCJul 12, 20:35 UTC40m
2026-07-12 N331RF - Jul 12, 19:05 UTCJul 12, 19:20 UTC15m
2026-07-12 N331RF - Jul 12, 15:40 UTCJul 12, 16:25 UTC45m
2026-07-09 N331RF - Jul 9, 16:00 UTCJul 9, 18:20 UTC2h 20m
2026-07-06 N331RF - Jul 6, 20:30 UTCJul 6, 21:25 UTC55m
2026-07-06 N331RF - Jul 6, 16:30 UTCJul 6, 17:10 UTC40m
2026-07-04 N331RF - Jul 4, 17:35 UTCJul 4, 20:50 UTC3h 15m
2026-07-02 N331RF - Jul 2, 22:30 UTCJul 3, 01:50 UTC3h 20m
2026-07-02 N331RF - Jul 2, 18:15 UTCJul 2, 18:35 UTC20m
2026-06-25 N331RF - Jun 25, 23:09 UTCJun 25, 23:24 UTC15m
2026-06-25 N331RF - Jun 25, 16:55 UTCJun 25, 17:09 UTC15m
2026-06-24 N331RF - Jun 24, 23:45 UTCJun 24, 23:59 UTC15m
2026-06-24 N331RF - Jun 24, 16:50 UTCJun 24, 17:05 UTC15m
2026-06-23 N331RF - Jun 23, 23:55 UTCJun 24, 00:20 UTC25m
2026-06-23 N331RF - Jun 23, 17:39 UTCJun 23, 17:54 UTC15m
2026-06-22 N331RF - Jun 22, 23:35 UTCJun 22, 23:50 UTC15m
2026-06-22 N331RF - Jun 22, 16:05 UTCJun 22, 16:20 UTC15m
2026-06-22 N331RF - Jun 22, 00:44 UTCJun 22, 00:55 UTC10m
2026-06-21 N331RF - Jun 21, 16:25 UTCJun 21, 16:39 UTC15m
2026-06-21 N331RF - Jun 21, 00:34 UTCJun 21, 00:45 UTC10m
2026-06-20 N331RF - Jun 20, 16:09 UTCJun 20, 16:24 UTC15m
2026-06-19 N331RF - Jun 19, 23:34 UTCJun 19, 23:44 UTC10m
2026-06-19 N331RF - Jun 19, 18:59 UTCJun 19, 19:14 UTC15m
2026-06-19 N331RF - Jun 19, 17:44 UTCJun 19, 17:55 UTC10m
2026-06-19 N331RF - Jun 19, 12:49 UTCJun 19, 13:29 UTC40m
2026-06-17 N331RF - Jun 17, 22:05 UTCJun 17, 23:30 UTC1h 25m
2026-06-13 N331RF - Jun 13, 16:10 UTCJun 13, 17:45 UTC1h 35m
2026-06-02 N331RF - Jun 2, 20:25 UTCJun 2, 20:55 UTC30m
2026-06-01 N331RF - Jun 1, 16:10 UTCJun 1, 21:10 UTC5h 0m
2026-05-31 N331RF YXJ → YXJ May 31, 15:55 UTCMay 31, 20:35 UTC4h 40m
2026-05-30 N331RF YXJ → YXJ May 30, 16:05 UTCMay 30, 20:25 UTC4h 20m
2026-05-29 N331RF - May 29, 20:55 UTCMay 29, 21:05 UTC10m
2026-05-29 N331RF - May 29, 15:15 UTCMay 29, 16:15 UTC1h 0m
2026-05-28 N331RF - May 28, 15:05 UTCMay 28, 21:25 UTC6h 20m
2026-05-27 N331RF YXE → YXE May 27, 15:05 UTCMay 27, 22:45 UTC7h 40m
2026-05-26 N331RF YXE → YXE May 26, 15:20 UTCMay 26, 18:45 UTC3h 25m
2026-05-25 N331RF YXE → YXE May 25, 15:15 UTCMay 25, 20:19 UTC5h 4m
2026-05-24 N331RF YXE → YXE May 24, 14:40 UTCMay 24, 19:40 UTC5h 0m
2026-05-23 N331RF YXE → YXE May 23, 14:35 UTCMay 23, 19:40 UTC5h 6m
2026-05-22 N331RF YXE → YXE May 22, 17:35 UTCMay 22, 21:25 UTC3h 50m
2026-05-21 N331RF YXE → YXE May 21, 14:50 UTCMay 21, 22:35 UTC7h 45m
2026-05-20 N331RF YXE → YXE May 20, 14:55 UTCMay 20, 21:40 UTC6h 45m
2026-05-19 N331RF YXE → YXE May 19, 14:30 UTCMay 19, 19:00 UTC4h 30m
2026-05-18 N331RF YXE → YXE May 18, 14:25 UTCMay 18, 15:25 UTC1h 0m
2026-05-13 N331RF YXE → YXE May 13, 14:45 UTCMay 13, 21:35 UTC6h 50m
2026-05-12 N331RF YXE → YXE May 12, 14:35 UTCMay 12, 20:20 UTC5h 45m
2026-05-11 N331RF - May 11, 16:35 UTCMay 11, 19:30 UTC2h 56m
2026-05-09 N331RF - May 9, 18:55 UTCMay 9, 19:10 UTC15m

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 N331RF page for operator, model, and routing details .

Mode-S A39B03 frequently asked

What is Mode-S code A39B03?
A39B03 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N331RF.
Where is Mode-S A39B03 registered?
Mode-S code A39B03 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 A39B03 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39B03, octal 50715403, decimal 10,722,051.
What flights does A39B03 operate?
Mode-S A39B03 has broadcast 1 distinct callsign, including N331RF.