Apparatus

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sensors Mode-S transponder

A27AAB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N259TW · operated by TW LEASING LLC

Hex
A27AAB
Octal
50475253
Decimal
10,648,235
Country
US
Tail
N259TW
Type
PC12
Transponder active on ground
Flights observed
184
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A27AAB.

Country allocation

The ICAO 24-bit address A27AAB 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
GPD259 Tradewind Aviation 184 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 GPD259 TEB → MVY May 30, 12:05 UTCMay 30, 12:15 UTC10m
2026-05-30 GPD259 TEB → MVY May 30, 00:40 UTCMay 30, 01:25 UTC45m
2026-05-29 GPD259 TEB → MVY May 29, 23:00 UTCMay 29, 23:35 UTC35m
2026-05-29 GPD259 TEB → MVY May 29, 21:20 UTCMay 29, 22:00 UTC40m
2026-05-29 GPD259 TEB → MVY May 29, 19:55 UTCMay 29, 20:35 UTC40m
2026-05-29 GPD259 TEB → MVY May 29, 00:30 UTCMay 29, 01:15 UTC45m
2026-05-28 GPD259 TEB → MVY May 28, 23:05 UTCMay 28, 23:40 UTC35m
2026-05-28 GPD259 TEB → MVY May 28, 20:05 UTCMay 28, 21:55 UTC1h 50m
2026-05-28 GPD259 TEB → MVY May 28, 18:10 UTCMay 28, 18:55 UTC45m
2026-05-28 GPD259 TEB → MVY May 28, 16:40 UTCMay 28, 17:15 UTC35m
2026-05-28 GPD259 TEB → MVY May 28, 15:10 UTCMay 28, 15:50 UTC40m
2026-05-28 GPD259 TEB → MVY May 28, 13:40 UTCMay 28, 14:20 UTC40m
2026-05-28 GPD259 TEB → MVY May 28, 12:25 UTCMay 28, 12:35 UTC10m
2026-05-27 GPD259 TEB → MVY May 27, 20:50 UTCMay 27, 22:25 UTC1h 35m
2026-05-27 GPD259 TEB → MVY May 27, 14:25 UTCMay 27, 18:15 UTC3h 50m
2026-05-27 GPD259 TEB → MVY May 27, 11:10 UTCMay 27, 12:25 UTC1h 15m
2026-05-26 GPD259 TEB → MVY May 26, 18:45 UTCMay 26, 19:05 UTC20m
2026-05-26 GPD259 TEB → MVY May 26, 17:09 UTCMay 26, 17:59 UTC50m
2026-05-26 GPD259 TEB → MVY May 26, 15:35 UTCMay 26, 16:15 UTC40m
2026-05-26 GPD259 TEB → MVY May 26, 13:54 UTCMay 26, 14:45 UTC50m
2026-05-26 GPD259 TEB → MVY May 26, 12:05 UTCMay 26, 12:45 UTC40m
2026-05-26 GPD259 TEB → MVY May 26, 10:39 UTCMay 26, 11:30 UTC50m
2026-05-26 GPD259 TEB → MVY May 26, 08:54 UTCMay 26, 09:29 UTC35m
2026-05-25 GPD259 TEB → MVY May 25, 23:35 UTCMay 26, 00:19 UTC45m
2026-05-25 GPD259 TEB → MVY May 25, 22:00 UTCMay 25, 22:34 UTC35m
2026-05-25 GPD259 TEB → MVY May 25, 20:40 UTCMay 25, 21:19 UTC40m
2026-05-25 GPD259 TEB → MVY May 25, 18:50 UTCMay 25, 19:30 UTC39m
2026-05-25 GPD259 TEB → MVY May 25, 16:35 UTCMay 25, 17:20 UTC45m
2026-05-25 GPD259 TEB → MVY May 25, 15:05 UTCMay 25, 15:45 UTC40m
2026-05-24 GPD259 TEB → MVY May 24, 12:05 UTCMay 24, 12:40 UTC35m
2026-05-23 GPD259 TEB → MVY May 23, 21:55 UTCMay 23, 22:10 UTC15m
2026-05-23 GPD259 TEB → MVY May 23, 00:10 UTCMay 23, 02:45 UTC2h 34m
2026-05-22 GPD259 TEB → MVY May 22, 22:55 UTCMay 22, 23:30 UTC35m
2026-05-22 GPD259 TEB → MVY May 22, 20:15 UTCMay 22, 21:55 UTC1h 40m
2026-05-22 GPD259 TEB → MVY May 22, 17:35 UTCMay 22, 18:10 UTC35m
2026-05-22 GPD259 TEB → MVY May 22, 16:25 UTCMay 22, 17:00 UTC35m
2026-05-22 GPD259 TEB → MVY May 22, 13:00 UTCMay 22, 14:45 UTC1h 45m
2026-05-21 GPD259 TEB → MVY May 21, 23:40 UTCMay 22, 01:35 UTC1h 55m
2026-05-21 GPD259 TEB → MVY May 21, 20:40 UTCMay 21, 22:40 UTC2h 0m
2026-05-21 GPD259 TEB → MVY May 21, 17:25 UTCMay 21, 18:30 UTC1h 5m
2026-05-21 GPD259 TEB → MVY May 21, 15:55 UTCMay 21, 16:35 UTC40m
2026-05-21 GPD259 TEB → MVY May 21, 01:40 UTCMay 21, 01:55 UTC15m
2026-05-20 GPD259 TEB → MVY May 20, 22:20 UTCMay 20, 22:50 UTC30m
2026-05-20 GPD259 TEB → MVY May 20, 13:45 UTCMay 20, 14:20 UTC35m
2026-05-20 GPD259 TEB → MVY May 20, 12:35 UTCMay 20, 12:45 UTC10m
2026-05-19 GPD259 TEB → MVY May 19, 19:10 UTCMay 19, 21:55 UTC2h 45m
2026-05-19 GPD259 TEB → MVY May 19, 17:45 UTCMay 19, 18:00 UTC15m
2026-05-18 GPD259 TEB → MVY May 18, 16:05 UTCMay 18, 17:25 UTC1h 20m
2026-05-18 GPD259 TEB → MVY May 18, 01:45 UTCMay 18, 02:20 UTC35m
2026-05-17 GPD259 TEB → MVY May 17, 23:25 UTCMay 18, 00:15 UTC50m

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 N259TW page for operator, model, and routing details .

Mode-S A27AAB frequently asked

What is Mode-S code A27AAB?
A27AAB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N259TW.
Where is Mode-S A27AAB registered?
Mode-S code A27AAB 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 A27AAB broadcasting right now?
Mode-S A27AAB is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A27AAB, octal 50475253, decimal 10,648,235.
What flights does A27AAB operate?
Mode-S A27AAB has broadcast 1 distinct callsign, including GPD259.