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sensors Mode-S transponder

A54259

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N438RM · PIPER PA-28-140/150/160/180 · operated by ROCKY MOUNTAIN COLLEGE

Hex
A54259
Octal
51241131
Decimal
10,830,425
Country
US
Tail
N438RM
Type
P28A
No current signal · last broadcast Jul 26, 17:40 UTC
Flights observed
117
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 17:40 UTC

Last known position

Most recent position reported by Mode-S A54259.

Country allocation

The ICAO 24-bit address A54259 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
N438RM - 117 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N438RM - Jul 26, 17:05 UTCJul 26, 17:40 UTC35m
2026-07-24 N438RM - Jul 24, 04:20 UTCJul 24, 04:30 UTC10m
2026-07-15 N438RM BIL → BIL Jul 15, 18:15 UTCJul 15, 18:25 UTC10m
2026-07-15 N438RM - Jul 15, 15:00 UTCJul 15, 16:00 UTC1h 0m
2026-07-14 N438RM - Jul 14, 13:05 UTCJul 14, 13:20 UTC15m
2026-07-11 N438RM - Jul 11, 15:45 UTCJul 11, 15:55 UTC10m
2026-07-10 N438RM - Jul 10, 18:25 UTCJul 10, 18:40 UTC15m
2026-07-09 N438RM - Jul 9, 17:05 UTCJul 9, 17:30 UTC25m
2026-07-08 N438RM - Jul 8, 06:40 UTCJul 8, 07:00 UTC20m
2026-07-07 N438RM - Jul 7, 19:50 UTCJul 7, 20:05 UTC15m
2026-07-07 N438RM - Jul 7, 17:25 UTCJul 7, 18:25 UTC1h 0m
2026-07-06 N438RM - Jul 6, 15:05 UTCJul 6, 15:35 UTC30m
2026-07-06 N438RM - Jul 6, 14:15 UTCJul 6, 14:30 UTC15m
2026-07-03 N438RM - Jul 3, 13:35 UTCJul 3, 13:55 UTC20m
2026-07-02 N438RM - Jul 2, 17:15 UTCJul 2, 18:10 UTC55m
2026-07-01 N438RM - Jul 1, 19:55 UTCJul 1, 21:35 UTC1h 40m
2026-07-01 N438RM - Jul 1, 14:50 UTCJul 1, 15:00 UTC10m
2026-07-01 N438RM - Jul 1, 04:40 UTCJul 1, 05:20 UTC40m
2026-07-01 N438RM - Jul 1, 02:05 UTCJul 1, 02:20 UTC15m
2026-06-30 N438RM - Jun 30, 13:50 UTCJun 30, 14:00 UTC10m
2026-06-24 N438RM - Jun 24, 18:34 UTCJun 24, 18:44 UTC10m
2026-06-24 N438RM - Jun 24, 13:40 UTCJun 24, 14:34 UTC55m
2026-06-24 N438RM - Jun 24, 12:50 UTCJun 24, 13:00 UTC10m
2026-06-24 N438RM - Jun 24, 04:34 UTCJun 24, 06:15 UTC1h 40m
2026-06-23 N438RM - Jun 23, 16:35 UTCJun 23, 17:34 UTC1h 0m
2026-06-19 N438RM - Jun 19, 14:09 UTCJun 19, 14:44 UTC35m
2026-06-19 N438RM - Jun 19, 04:29 UTCJun 19, 05:30 UTC1h 0m
2026-06-18 N438RM - Jun 18, 05:25 UTCJun 18, 05:40 UTC15m
2026-06-16 N438RM - Jun 16, 04:25 UTCJun 16, 04:35 UTC10m
2026-06-15 N438RM - Jun 15, 14:45 UTCJun 15, 15:19 UTC35m
2026-06-12 N438RM - Jun 12, 17:05 UTCJun 12, 18:15 UTC1h 10m
2026-06-12 N438RM - Jun 12, 05:00 UTCJun 12, 06:35 UTC1h 35m
2026-06-12 N438RM - Jun 12, 02:45 UTCJun 12, 03:05 UTC20m
2026-06-12 N438RM - Jun 12, 01:30 UTCJun 12, 01:55 UTC25m
2026-06-11 N438RM - Jun 11, 23:10 UTCJun 12, 00:30 UTC1h 20m
2026-06-09 N438RM - Jun 9, 14:05 UTCJun 9, 14:15 UTC10m
2026-06-08 N438RM - Jun 8, 21:35 UTCJun 8, 21:45 UTC10m
2026-06-06 N438RM - Jun 6, 16:14 UTCJun 6, 16:45 UTC30m
2026-06-05 N438RM - Jun 5, 18:50 UTCJun 5, 19:50 UTC1h 0m
2026-06-05 N438RM - Jun 5, 14:40 UTCJun 5, 15:05 UTC25m
2026-06-04 N438RM - Jun 4, 01:35 UTCJun 4, 01:45 UTC10m
2026-06-04 N438RM - Jun 4, 00:25 UTCJun 4, 00:35 UTC10m
2026-06-03 N438RM - Jun 3, 19:30 UTCJun 3, 20:35 UTC1h 5m
2026-06-03 N438RM - Jun 3, 16:55 UTCJun 3, 17:05 UTC10m
2026-06-03 N438RM - Jun 3, 16:05 UTCJun 3, 16:15 UTC10m
2026-06-02 N438RM - Jun 2, 20:35 UTCJun 2, 21:25 UTC50m
2026-06-02 N438RM - Jun 2, 18:15 UTCJun 2, 18:25 UTC10m
2026-06-02 N438RM - Jun 2, 16:00 UTCJun 2, 16:10 UTC10m
2026-06-01 N438RM - Jun 1, 13:55 UTCJun 1, 14:10 UTC15m
2026-05-26 N438RM - May 26, 18:40 UTCMay 26, 19:05 UTC25m

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 N438RM page for operator, model, and routing details .

Mode-S A54259 frequently asked

What is Mode-S code A54259?
A54259 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N438RM.
Where is Mode-S A54259 registered?
Mode-S code A54259 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 A54259 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54259, octal 51241131, decimal 10,830,425.
What flights does A54259 operate?
Mode-S A54259 has broadcast 1 distinct callsign, including N438RM.