sensors Mode-S transponder

AA221F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N752GT · operated by GTA56 LLC

Hex
AA221F
Octal
52421037
Decimal
11,149,855
Country
US
Tail
N752GT
No current signal · last broadcast 4d ago
Flights observed
16
Distinct callsigns
1
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S AA221F.

Country allocation

The ICAO 24-bit address AA221F 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
N752GT - 16 2026-05-29

Recent flights last 16

DateFlightRouteTakeoffLandingDuration
2026-05-29 N752GT - May 29, 16:00 UTCMay 29, 17:55 UTC1h 55m
2026-05-29 N752GT - May 29, 14:00 UTCMay 29, 14:40 UTC40m
2026-05-27 N752GT - May 27, 20:45 UTCMay 27, 20:55 UTC10m
2026-04-28 N752GT - Apr 28, 18:45 UTCApr 28, 20:00 UTC1h 15m
2026-04-26 N752GT HSH → ATL Apr 26, 18:45 UTCApr 26, 21:55 UTC3h 10m
2026-04-26 N752GT - Apr 26, 16:35 UTCApr 26, 17:30 UTC55m
2026-04-22 N752GT - Apr 22, 16:20 UTCApr 22, 19:55 UTC3h 35m
2026-04-22 N752GT SUA → SRQ Apr 22, 14:35 UTCApr 22, 15:15 UTC40m
2026-04-19 N752GT SAV → SUA Apr 19, 22:30 UTCApr 19, 23:25 UTC55m
2026-04-19 N752GT - Apr 19, 19:10 UTCApr 19, 20:25 UTC1h 15m
2026-04-17 N752GT - Apr 17, 17:25 UTCApr 17, 18:25 UTC1h 0m
2026-04-17 N752GT - Apr 17, 16:30 UTCApr 17, 17:15 UTC45m
2026-04-16 N752GT - Apr 16, 17:15 UTCApr 16, 19:10 UTC1h 55m
2026-04-16 N752GT - Apr 16, 15:15 UTCApr 16, 16:05 UTC50m
2026-04-13 N752GT - Apr 13, 21:00 UTCApr 13, 22:40 UTC1h 40m
2026-04-13 N752GT - Apr 13, 17:35 UTCApr 13, 18:30 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 N752GT page for operator, model, and routing details .

Mode-S AA221F frequently asked

What is Mode-S code AA221F?
AA221F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N752GT.
Where is Mode-S AA221F registered?
Mode-S code AA221F 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 AA221F broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA221F, octal 52421037, decimal 11,149,855.
What flights does AA221F operate?
Mode-S AA221F has broadcast 1 distinct callsign, including N752GT.