Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A25B59

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N251BL · operated by SKYWARRIOR FLIGHT TRAINING LLC

Hex
A25B59
Octal
50455531
Decimal
10,640,217
Country
US
Tail
N251BL
Type
DA40
No current signal · last broadcast 3d ago
Flights observed
24
Distinct callsigns
2
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S A25B59.

Country allocation

The ICAO 24-bit address A25B59 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 2 distinct

Callsign Airline Flights Last seen
JJ51 - 15 2026-06-20
N251BL - 9 2026-06-19

Recent flights last 24

DateFlightRouteTakeoffLandingDuration
2026-06-20 JJ51 - Jun 20, 21:55 UTCJun 20, 22:05 UTC10m
2026-06-20 JJ51 - Jun 20, 20:29 UTCJun 20, 20:40 UTC10m
2026-06-20 JJ51 - Jun 20, 19:19 UTCJun 20, 19:29 UTC10m
2026-06-19 N251BL - Jun 19, 12:19 UTCJun 19, 13:54 UTC1h 35m
2026-06-15 N251BL - Jun 15, 20:04 UTCJun 15, 21:55 UTC1h 50m
2026-06-15 JJ51 PNS → PNS Jun 15, 16:45 UTCJun 15, 18:25 UTC1h 40m
2026-06-11 N251BL - Jun 11, 20:50 UTCJun 11, 22:30 UTC1h 40m
2026-06-11 JJ51 - Jun 11, 18:05 UTCJun 11, 19:55 UTC1h 50m
2026-06-11 JJ51 - Jun 11, 15:45 UTCJun 11, 17:05 UTC1h 20m
2026-06-11 N251BL - Jun 11, 13:20 UTCJun 11, 14:55 UTC1h 35m
2026-06-09 JJ51 - Jun 9, 19:00 UTCJun 9, 20:45 UTC1h 45m
2026-06-09 JJ51 - Jun 9, 13:55 UTCJun 9, 14:45 UTC50m
2026-06-09 JJ51 - Jun 9, 13:05 UTCJun 9, 13:15 UTC10m
2026-06-06 N251BL - Jun 6, 12:35 UTCJun 6, 14:00 UTC1h 25m
2026-06-05 N251BL - Jun 5, 17:45 UTCJun 5, 18:20 UTC35m
2026-06-05 N251BL - Jun 5, 16:45 UTCJun 5, 17:15 UTC30m
2026-06-05 N251BL - Jun 5, 13:55 UTCJun 5, 15:35 UTC1h 40m
2026-06-01 JJ51 - Jun 1, 20:15 UTCJun 1, 21:00 UTC45m
2026-05-31 JJ51 - May 31, 19:10 UTCMay 31, 19:20 UTC10m
2026-05-31 JJ51 - May 31, 17:10 UTCMay 31, 18:20 UTC1h 10m
2026-05-30 JJ51 - May 30, 21:25 UTCMay 30, 22:45 UTC1h 20m
2026-05-29 N251BL - May 29, 15:55 UTCMay 29, 16:45 UTC50m
2026-05-29 JJ51 - May 29, 12:50 UTCMay 29, 14:35 UTC1h 45m
2026-05-28 JJ51 - May 28, 14:45 UTCMay 28, 15:20 UTC35m

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 N251BL page for operator, model, and routing details .

Mode-S A25B59 frequently asked

What is Mode-S code A25B59?
A25B59 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N251BL.
Where is Mode-S A25B59 registered?
Mode-S code A25B59 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 A25B59 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25B59, octal 50455531, decimal 10,640,217.
What flights does A25B59 operate?
Mode-S A25B59 has broadcast 2 distinct callsigns, including JJ51, N251BL.