Apparatus

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sensors Mode-S transponder

A9089D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N681TF · operated by AIR FLEET HOLDINGS LLC

Hex
A9089D
Octal
52204235
Decimal
11,077,789
Country
US
Tail
N681TF
Type
P28A
No current signal · last broadcast 1h ago
Flights observed
118
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A9089D.

Country allocation

The ICAO 24-bit address A9089D 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
TRF581 - 118 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-20 TRF581 - Jun 20, 21:40 UTCJun 20, 22:54 UTC1h 15m
2026-06-20 TRF581 - Jun 20, 19:29 UTCJun 20, 21:05 UTC1h 35m
2026-06-20 TRF581 - Jun 20, 17:14 UTCJun 20, 18:49 UTC1h 35m
2026-06-19 TRF581 - Jun 19, 23:59 UTCJun 20, 01:34 UTC1h 35m
2026-06-19 TRF581 - Jun 19, 21:30 UTCJun 19, 21:44 UTC15m
2026-06-19 TRF581 - Jun 19, 19:19 UTCJun 19, 20:34 UTC1h 15m
2026-06-19 TRF581 ADS → TRL Jun 19, 18:30 UTCJun 19, 19:14 UTC45m
2026-06-19 TRF581 ADS → ADS Jun 19, 16:19 UTCJun 19, 17:29 UTC1h 10m
2026-06-18 TRF581 - Jun 18, 22:10 UTCJun 19, 00:05 UTC1h 55m
2026-06-18 TRF581 - Jun 18, 19:25 UTCJun 18, 20:30 UTC1h 5m
2026-06-18 TRF581 - Jun 18, 17:15 UTCJun 18, 18:50 UTC1h 35m
2026-06-18 TRF581 - Jun 18, 14:20 UTCJun 18, 15:55 UTC1h 35m
2026-06-18 TRF581 - Jun 18, 12:25 UTCJun 18, 13:50 UTC1h 25m
2026-06-17 TRF581 ADS → ADS Jun 17, 22:50 UTCJun 18, 00:35 UTC1h 45m
2026-06-17 TRF581 ADS → ADS Jun 17, 15:35 UTCJun 17, 17:00 UTC1h 25m
2026-06-17 TRF581 - Jun 17, 13:00 UTCJun 17, 15:00 UTC2h 0m
2026-06-17 TRF581 - Jun 17, 03:40 UTCJun 17, 05:15 UTC1h 35m
2026-06-17 TRF581 - Jun 17, 00:30 UTCJun 17, 02:05 UTC1h 35m
2026-06-16 TRF581 - Jun 16, 22:25 UTCJun 16, 23:00 UTC35m
2026-06-16 TRF581 - Jun 16, 19:55 UTCJun 16, 21:05 UTC1h 10m
2026-06-16 TRF581 ADS → ADS Jun 16, 17:40 UTCJun 16, 19:00 UTC1h 20m
2026-06-15 TRF581 - Jun 15, 23:50 UTCJun 16, 01:30 UTC1h 40m
2026-06-15 TRF581 - Jun 15, 21:09 UTCJun 15, 22:05 UTC55m
2026-06-15 TRF581 ADS → ADS Jun 15, 18:20 UTCJun 15, 18:25 UTC5m
2026-06-15 TRF581 ADS → ADS Jun 15, 14:55 UTCJun 15, 16:09 UTC1h 15m
2026-06-14 TRF581 - Jun 14, 19:55 UTCJun 15, 00:15 UTC4h 19m
2026-06-14 TRF581 - Jun 14, 17:25 UTCJun 14, 18:55 UTC1h 30m
2026-06-13 TRF581 - Jun 13, 17:45 UTCJun 13, 19:05 UTC1h 20m
2026-06-11 TRF581 - Jun 11, 16:20 UTCJun 11, 16:55 UTC35m
2026-06-11 TRF581 - Jun 11, 14:40 UTCJun 11, 15:00 UTC20m
2026-06-11 TRF581 ADS → ADS Jun 11, 12:20 UTCJun 11, 13:55 UTC1h 35m
2026-06-10 TRF581 - Jun 10, 21:10 UTCJun 10, 22:40 UTC1h 30m
2026-06-10 TRF581 - Jun 10, 18:35 UTCJun 10, 19:50 UTC1h 15m
2026-06-09 TRF581 - Jun 9, 16:45 UTCJun 9, 18:20 UTC1h 35m
2026-06-08 TRF581 - Jun 8, 23:25 UTCJun 9, 01:00 UTC1h 35m
2026-06-08 TRF581 - Jun 8, 20:45 UTCJun 8, 21:55 UTC1h 10m
2026-06-06 TRF581 - Jun 6, 21:40 UTCJun 6, 21:54 UTC15m
2026-06-06 TRF581 - Jun 6, 17:24 UTCJun 6, 18:35 UTC1h 10m
2026-06-04 TRF581 - Jun 4, 15:25 UTCJun 4, 16:50 UTC1h 25m
2026-06-03 TRF581 - Jun 3, 19:40 UTCJun 3, 20:45 UTC1h 5m
2026-06-03 TRF581 ADS → ADS Jun 3, 17:20 UTCJun 3, 18:45 UTC1h 25m
2026-06-01 TRF581 - Jun 1, 19:00 UTCJun 1, 20:55 UTC1h 55m
2026-06-01 TRF581 - Jun 1, 15:35 UTCJun 1, 16:10 UTC35m
2026-06-01 TRF581 - Jun 1, 11:40 UTCJun 1, 13:05 UTC1h 25m
2026-05-17 TRF581 - May 17, 23:30 UTCMay 18, 01:20 UTC1h 50m
2026-05-17 TRF581 ADS → ADS May 17, 20:55 UTCMay 17, 22:40 UTC1h 45m
2026-05-17 TRF581 ADS → ADS May 17, 18:25 UTCMay 17, 19:45 UTC1h 20m
2026-05-17 TRF581 - May 17, 11:35 UTCMay 17, 12:15 UTC40m
2026-05-17 TRF581 ADS → ADS May 17, 09:40 UTCMay 17, 10:00 UTC20m
2026-05-16 TRF581 ADS → ADS May 16, 22:35 UTCMay 17, 01:20 UTC2h 45m

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 N681TF page for operator, model, and routing details .

Mode-S A9089D frequently asked

What is Mode-S code A9089D?
A9089D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N681TF.
Where is Mode-S A9089D registered?
Mode-S code A9089D 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 A9089D broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9089D, octal 52204235, decimal 11,077,789.
What flights does A9089D operate?
Mode-S A9089D has broadcast 1 distinct callsign, including TRF581.