Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A2531F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N249TH · BELL 206 JetRanger · operated by TIMBERLAND HELICOPTERS INC

Hex
A2531F
Octal
50451437
Decimal
10,638,111
Country
US
Tail
N249TH
Type
B06
No current signal · last broadcast 22d ago
Flights observed
50
Distinct callsigns
1
Country
US
Last broadcast
22d ago

Last known position

Most recent position reported by Mode-S A2531F.

Country allocation

The ICAO 24-bit address A2531F 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
N249TH - 50 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 N249TH - Jun 25, 19:59 UTCJun 25, 20:09 UTC10m
2026-06-25 N249TH - Jun 25, 17:49 UTCJun 25, 18:00 UTC10m
2026-06-25 N249TH - Jun 25, 16:24 UTCJun 25, 16:35 UTC10m
2026-06-24 N249TH - Jun 24, 18:20 UTCJun 24, 18:34 UTC15m
2026-06-23 N249TH - Jun 23, 20:15 UTCJun 23, 20:29 UTC15m
2026-06-23 N249TH - Jun 23, 13:19 UTCJun 23, 13:39 UTC20m
2026-06-18 N249TH OGD → OGD Jun 18, 21:50 UTCJun 18, 23:05 UTC1h 15m
2026-06-17 N249TH - Jun 17, 21:35 UTCJun 17, 22:05 UTC30m
2026-06-17 N249TH - Jun 17, 13:20 UTCJun 17, 13:55 UTC35m
2026-06-16 N249TH - Jun 16, 20:40 UTCJun 16, 21:00 UTC20m
2026-06-16 N249TH - Jun 16, 13:25 UTCJun 16, 13:55 UTC30m
2026-06-14 N249TH OGD → OGD Jun 14, 16:25 UTCJun 14, 16:55 UTC30m
2026-06-13 N249TH - Jun 13, 21:20 UTCJun 13, 22:05 UTC45m
2026-06-13 N249TH - Jun 13, 20:15 UTCJun 13, 20:30 UTC15m
2026-06-13 N249TH OGD → OGD Jun 13, 18:55 UTCJun 13, 19:05 UTC10m
2026-06-11 N249TH - Jun 11, 19:10 UTCJun 11, 19:35 UTC25m
2026-06-11 N249TH - Jun 11, 14:05 UTCJun 11, 14:25 UTC20m
2026-06-10 N249TH - Jun 10, 19:45 UTCJun 10, 20:05 UTC20m
2026-06-10 N249TH - Jun 10, 14:10 UTCJun 10, 14:30 UTC20m
2026-06-09 N249TH - Jun 9, 21:05 UTCJun 9, 21:40 UTC35m
2026-06-09 N249TH - Jun 9, 13:55 UTCJun 9, 14:35 UTC40m
2026-06-08 N249TH - Jun 8, 18:05 UTCJun 8, 18:25 UTC20m
2026-06-08 N249TH - Jun 8, 14:10 UTCJun 8, 14:30 UTC20m
2026-06-05 N249TH - Jun 5, 00:05 UTCJun 5, 00:25 UTC20m
2026-06-04 N249TH - Jun 4, 14:15 UTCJun 4, 14:40 UTC25m
2026-06-03 N249TH - Jun 3, 21:45 UTCJun 3, 22:00 UTC15m
2026-06-03 N249TH - Jun 3, 20:35 UTCJun 3, 21:05 UTC30m
2026-06-03 N249TH - Jun 3, 18:50 UTCJun 3, 19:55 UTC1h 5m
2026-06-03 N249TH - Jun 3, 16:25 UTCJun 3, 17:30 UTC1h 5m
2026-06-03 N249TH - Jun 3, 14:25 UTCJun 3, 14:45 UTC20m
2026-05-25 N249TH - May 25, 18:50 UTCMay 25, 19:10 UTC20m
2026-05-25 N249TH - May 25, 17:00 UTCMay 25, 17:15 UTC15m
2026-05-24 N249TH - May 24, 15:00 UTCMay 24, 15:30 UTC30m
2026-05-07 N249TH - May 7, 20:45 UTCMay 7, 20:55 UTC10m
2026-05-06 N249TH - May 6, 20:40 UTCMay 6, 20:55 UTC15m
2026-05-06 N249TH - May 6, 12:35 UTCMay 6, 13:05 UTC30m
2026-05-05 N249TH - May 5, 14:35 UTCMay 5, 14:55 UTC20m
2026-05-05 N249TH - May 5, 12:45 UTCMay 5, 13:20 UTC35m
2026-04-29 N249TH - Apr 29, 13:05 UTCApr 29, 17:40 UTC4h 35m
2026-04-25 N249TH - Apr 25, 02:35 UTCApr 25, 02:55 UTC20m
2026-04-24 N249TH - Apr 24, 21:00 UTCApr 24, 21:40 UTC40m
2026-04-22 N249TH - Apr 22, 21:45 UTCApr 22, 22:05 UTC20m
2026-04-22 N249TH - Apr 22, 12:15 UTCApr 22, 12:40 UTC25m
2026-04-20 N249TH BTF → OGD Apr 20, 19:20 UTCApr 20, 19:35 UTC15m
2026-04-20 N249TH - Apr 20, 18:10 UTCApr 20, 18:20 UTC10m
2026-04-20 N249TH - Apr 20, 17:15 UTCApr 20, 17:30 UTC15m
2026-04-20 N249TH - Apr 20, 12:45 UTCApr 20, 13:05 UTC20m
2026-04-16 N249TH - Apr 16, 17:44 UTCApr 16, 18:05 UTC20m
2026-04-16 N249TH - Apr 16, 12:45 UTCApr 16, 13:00 UTC15m
2026-04-15 N249TH - Apr 15, 19:15 UTCApr 15, 19:30 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 N249TH page for operator, model, and routing details .

Mode-S A2531F frequently asked

What is Mode-S code A2531F?
A2531F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N249TH.
Where is Mode-S A2531F registered?
Mode-S code A2531F 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 A2531F broadcasting right now?
No active broadcast right now. Last signal was 22d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2531F, octal 50451437, decimal 10,638,111.
What flights does A2531F operate?
Mode-S A2531F has broadcast 1 distinct callsign, including N249TH.