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sensors Mode-S transponder

A641F8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N502GD · AIR TRACTOR AT-504 · operated by BRETT'S SPRAY SERVICE INC

Hex
A641F8
Octal
51440770
Decimal
10,895,864
Country
US
Tail
N502GD
Type
AT5T
No current signal · last broadcast Jul 26, 18:05 UTC
Flights observed
21
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 18:05 UTC

Last known position

Most recent position reported by Mode-S A641F8.

Country allocation

The ICAO 24-bit address A641F8 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
N502GD - 20 2026-07-26

Recent flights last 21

DateFlightRouteTakeoffLandingDuration
2026-07-26 N502GD - Jul 26, 17:55 UTCJul 26, 18:05 UTC10m
2026-07-24 N502GD - Jul 24, 15:45 UTCJul 24, 15:55 UTC10m
2026-07-17 N502GD - Jul 17, 23:05 UTCJul 18, 00:45 UTC1h 40m
2026-07-17 N502GD - Jul 17, 21:44 UTCJul 17, 22:05 UTC20m
2026-07-17 - - Jul 17, 20:04 UTCJul 17, 20:50 UTC45m
2026-07-17 N502GD - Jul 17, 18:50 UTCJul 17, 19:09 UTC20m
2026-07-17 N502GD - Jul 17, 18:05 UTCJul 17, 18:15 UTC10m
2026-06-15 N502GD - Jun 15, 12:10 UTCJun 15, 12:45 UTC35m
2026-06-12 N502GD - Jun 12, 23:35 UTCJun 12, 23:45 UTC10m
2026-06-12 N502GD - Jun 12, 13:40 UTCJun 12, 14:05 UTC25m
2026-06-05 N502GD - Jun 5, 23:45 UTCJun 5, 23:55 UTC10m
2026-06-04 N502GD - Jun 4, 23:10 UTCJun 4, 23:35 UTC25m
2026-05-31 N502GD - May 31, 15:10 UTCMay 31, 15:55 UTC45m
2026-05-28 N502GD - May 28, 14:30 UTCMay 28, 14:40 UTC10m
2026-05-28 N502GD - May 28, 12:15 UTCMay 28, 13:05 UTC50m
2026-05-28 N502GD - May 28, 11:05 UTCMay 28, 11:20 UTC15m
2026-05-27 N502GD - May 27, 15:20 UTCMay 27, 15:30 UTC10m
2026-05-27 N502GD - May 27, 13:25 UTCMay 27, 14:10 UTC45m
2026-05-27 N502GD - May 27, 12:15 UTCMay 27, 12:25 UTC10m
2026-05-23 N502GD - May 23, 18:25 UTCMay 23, 18:35 UTC10m
2026-05-23 N502GD - May 23, 16:55 UTCMay 23, 17:45 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 N502GD page for operator, model, and routing details .

Mode-S A641F8 frequently asked

What is Mode-S code A641F8?
A641F8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N502GD.
Where is Mode-S A641F8 registered?
Mode-S code A641F8 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 A641F8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A641F8, octal 51440770, decimal 10,895,864.
What flights does A641F8 operate?
Mode-S A641F8 has broadcast 1 distinct callsign, including N502GD.