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 14h ago
Flights observed
265
Distinct callsigns
1
Country
US
Last broadcast
14h ago

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 - 265 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-07 N825US VGT → VGT Jul 7, 14:55 UTCJul 7, 15:55 UTC1h 0m
2026-07-06 N825US - Jul 6, 18:25 UTCJul 6, 18:40 UTC15m
2026-07-06 N825US - Jul 6, 16:10 UTCJul 6, 16:25 UTC15m
2026-07-06 N825US - Jul 6, 12:35 UTCJul 6, 12:50 UTC15m
2026-07-04 N825US - Jul 4, 19:20 UTCJul 4, 20:55 UTC1h 35m
2026-07-04 N825US VGT → VGT Jul 4, 16:35 UTCJul 4, 16:45 UTC10m
2026-07-04 N825US VGT → VGT Jul 4, 16:20 UTCJul 4, 16:30 UTC10m
2026-07-04 N825US - Jul 4, 16:05 UTCJul 4, 16:15 UTC10m
2026-07-04 N825US VGT → VGT Jul 4, 13:35 UTCJul 4, 14:40 UTC1h 5m
2026-07-03 N825US VGT → VGT Jul 3, 18:05 UTCJul 3, 19:20 UTC1h 15m
2026-07-03 N825US VGT → VGT Jul 3, 16:00 UTCJul 3, 16:45 UTC45m
2026-07-03 N825US VGT → VGT Jul 3, 12:35 UTCJul 3, 14:15 UTC1h 40m
2026-07-01 N825US VGT → VGT Jul 1, 18:40 UTCJul 1, 19:35 UTC55m
2026-07-01 N825US VGT → VGT Jul 1, 16:40 UTCJul 1, 17:40 UTC1h 0m
2026-07-01 N825US HII → VGT Jul 1, 03:30 UTCJul 1, 04:45 UTC1h 15m
2026-07-01 N825US VGT → HII Jul 1, 02:05 UTCJul 1, 03:25 UTC1h 20m
2026-06-30 N825US VGT → VGT Jun 30, 17:40 UTCJun 30, 18:15 UTC35m
2026-06-30 N825US VGT → VGT Jun 30, 15:45 UTCJun 30, 16:25 UTC40m
2026-06-30 N825US - Jun 30, 14:25 UTCJun 30, 14:50 UTC25m
2026-06-30 N825US - Jun 30, 13:20 UTCJun 30, 13:40 UTC20m
2026-06-30 N825US VGT → VGT Jun 30, 00:39 UTCJun 30, 02:20 UTC1h 41m
2026-06-29 N825US VGT → VGT Jun 29, 19:54 UTCJun 29, 21:05 UTC1h 10m
2026-06-29 N825US VGT → VGT Jun 29, 18:05 UTCJun 29, 18:39 UTC35m
2026-06-29 N825US - Jun 29, 16:15 UTCJun 29, 16:50 UTC35m
2026-06-29 N825US - Jun 29, 15:09 UTCJun 29, 15:45 UTC35m
2026-06-29 N825US VGT → VGT Jun 29, 12:49 UTCJun 29, 13:54 UTC1h 5m
2026-06-28 N825US VGT → VGT Jun 28, 20:59 UTCJun 28, 21:04 UTC5m
2026-06-28 N825US VGT → VGT Jun 28, 19:40 UTCJun 28, 20:34 UTC55m
2026-06-28 N825US VGT → VGT Jun 28, 17:04 UTCJun 28, 18:05 UTC1h 0m

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 14h ago.
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.