Apparatus

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sensors Mode-S transponder

AB4541

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N825US · DIAMOND DA-40 Club Star · operated by TACTICAL INTEGRATED TRAINING SOLUTIONS LLC

Hex
AB4541
Octal
52642501
Decimal
11,224,385
Country
US
Tail
N825US
Type
DA40
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
294
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S AB4541.

Country allocation

The ICAO 24-bit address AB4541 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
N825US - 294 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N825US - Jul 26, 20:20 UTCJul 26, 20:40 UTC20m
2026-07-26 N825US - Jul 26, 18:25 UTCJul 26, 19:05 UTC40m
2026-07-26 N825US VGT → VGT Jul 26, 15:35 UTCJul 26, 17:00 UTC1h 25m
2026-07-26 N825US VGT → VGT Jul 26, 14:05 UTCJul 26, 14:50 UTC45m
2026-07-25 N825US VGT → VGT Jul 25, 15:55 UTCJul 25, 16:50 UTC55m
2026-07-25 N825US - Jul 25, 14:05 UTCJul 25, 14:50 UTC45m
2026-07-25 N825US VGT → VGT Jul 25, 05:45 UTCJul 25, 06:00 UTC15m
2026-07-24 N825US VGT → VGT Jul 24, 18:45 UTCJul 24, 19:40 UTC55m
2026-07-24 N825US - Jul 24, 14:15 UTCJul 24, 14:55 UTC40m
2026-07-24 N825US - Jul 24, 12:20 UTCJul 24, 13:20 UTC1h 0m
2026-07-23 N825US VGT → VGT Jul 23, 17:45 UTCJul 23, 18:55 UTC1h 10m
2026-07-23 N825US - Jul 23, 14:55 UTCJul 23, 15:10 UTC15m
2026-07-23 N825US - Jul 23, 13:40 UTCJul 23, 14:15 UTC35m
2026-07-23 N825US VGT → VGT Jul 23, 02:35 UTCJul 23, 04:30 UTC1h 55m
2026-07-22 N825US - Jul 22, 17:05 UTCJul 22, 17:50 UTC45m
2026-07-21 N825US VGT → VGT Jul 21, 17:55 UTCJul 21, 18:55 UTC1h 0m
2026-07-21 N825US VGT → VGT Jul 21, 15:50 UTCJul 21, 16:40 UTC50m
2026-07-21 N825US VGT → VGT Jul 21, 13:35 UTCJul 21, 14:15 UTC40m
2026-07-20 N825US VGT → VGT Jul 20, 18:00 UTCJul 20, 19:00 UTC1h 0m
2026-07-20 N825US VGT → VGT Jul 20, 15:00 UTCJul 20, 15:55 UTC55m
2026-07-19 N825US - Jul 19, 14:20 UTCJul 19, 15:35 UTC1h 15m
2026-07-19 N825US VGT → VGT Jul 19, 14:05 UTCJul 19, 14:15 UTC10m
2026-07-18 N825US - Jul 18, 23:10 UTCJul 18, 23:30 UTC20m
2026-07-18 N825US VGT → VGT Jul 18, 22:25 UTCJul 18, 23:00 UTC35m
2026-07-18 N825US VGT → VGT Jul 18, 18:35 UTCJul 18, 19:25 UTC50m
2026-07-17 N825US VGT → VGT Jul 17, 19:00 UTCJul 17, 20:10 UTC1h 10m
2026-07-17 N825US VGT → VGT Jul 17, 15:25 UTCJul 17, 16:00 UTC35m
2026-07-14 N825US VGT → VGT Jul 14, 16:10 UTCJul 14, 16:50 UTC40m
2026-07-14 N825US VGT → VGT Jul 14, 12:45 UTCJul 14, 14:15 UTC1h 30m
2026-07-13 N825US VGT → VGT Jul 13, 18:05 UTCJul 13, 19:05 UTC1h 0m
2026-07-13 N825US VGT → VGT Jul 13, 14:55 UTCJul 13, 15:25 UTC30m
2026-07-13 N825US VGT → VGT Jul 13, 12:50 UTCJul 13, 13:35 UTC45m
2026-07-12 N825US - Jul 12, 20:15 UTCJul 12, 20:45 UTC30m
2026-07-12 N825US - Jul 12, 18:55 UTCJul 12, 19:35 UTC40m
2026-07-12 N825US - Jul 12, 16:15 UTCJul 12, 17:55 UTC1h 40m
2026-07-12 N825US - Jul 12, 14:50 UTCJul 12, 15:35 UTC45m
2026-07-11 N825US VGT → VGT Jul 11, 17:00 UTCJul 11, 17:40 UTC40m
2026-07-11 N825US - Jul 11, 14:40 UTCJul 11, 14:55 UTC15m
2026-07-11 N825US - Jul 11, 12:45 UTCJul 11, 13:00 UTC15m
2026-07-10 N825US - Jul 10, 19:50 UTCJul 10, 21:20 UTC1h 30m
2026-07-10 N825US VGT → VGT Jul 10, 16:20 UTCJul 10, 16:50 UTC30m
2026-07-10 N825US VGT → VGT Jul 10, 13:30 UTCJul 10, 14:40 UTC1h 10m
2026-07-10 N825US VGT → VGT Jul 10, 13:05 UTCJul 10, 13:20 UTC15m
2026-07-09 N825US - Jul 9, 20:45 UTCJul 9, 22:00 UTC1h 15m
2026-07-09 N825US - Jul 9, 15:25 UTCJul 9, 16:00 UTC35m
2026-07-09 N825US - Jul 9, 14:00 UTCJul 9, 14:30 UTC30m
2026-07-09 N825US VGT → VGT Jul 9, 04:50 UTCJul 9, 06:05 UTC1h 15m
2026-07-08 N825US - Jul 8, 15:00 UTCJul 8, 15:50 UTC50m
2026-07-08 N825US VGT → VGT Jul 8, 12:30 UTCJul 8, 13:55 UTC1h 25m
2026-07-07 N825US VGT → VGT Jul 7, 17:15 UTCJul 7, 18:10 UTC55m

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 N825US page for operator, model, and routing details .

Mode-S AB4541 frequently asked

What is Mode-S code AB4541?
AB4541 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N825US.
Where is Mode-S AB4541 registered?
Mode-S code AB4541 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 AB4541 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB4541, octal 52642501, decimal 11,224,385.
What flights does AB4541 operate?
Mode-S AB4541 has broadcast 1 distinct callsign, including N825US.