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sensors Mode-S transponder

A639F6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N500AF · PIPER PA-28-140/150/160/180 · operated by AMERIFLYERS OF TEXAS INC

Hex
A639F6
Octal
51434766
Decimal
10,893,814
Country
US
Tail
N500AF
Type
P28A
No current signal · last broadcast Jul 26, 14:45 UTC
Flights observed
171
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 14:45 UTC

Last known position

Most recent position reported by Mode-S A639F6.

Country allocation

The ICAO 24-bit address A639F6 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
N500AF - 171 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N500AF COI → COI Jul 26, 13:25 UTCJul 26, 14:45 UTC1h 20m
2026-07-25 N500AF - Jul 25, 11:30 UTCJul 25, 14:05 UTC2h 35m
2026-07-24 N500AF - Jul 24, 22:55 UTCJul 24, 23:50 UTC55m
2026-07-24 N500AF - Jul 24, 18:05 UTCJul 24, 18:50 UTC45m
2026-07-24 N500AF - Jul 24, 16:55 UTCJul 24, 17:05 UTC10m
2026-07-24 N500AF - Jul 24, 12:25 UTCJul 24, 13:25 UTC1h 0m
2026-07-23 N500AF COI → COI Jul 23, 18:25 UTCJul 23, 19:40 UTC1h 15m
2026-07-23 N500AF - Jul 23, 13:55 UTCJul 23, 15:45 UTC1h 50m
2026-07-22 N500AF - Jul 22, 19:45 UTCJul 22, 20:40 UTC55m
2026-07-22 N500AF - Jul 22, 18:20 UTCJul 22, 18:45 UTC25m
2026-07-22 N500AF COI → COI Jul 22, 16:50 UTCJul 22, 17:50 UTC1h 0m
2026-07-22 N500AF COI → COI Jul 22, 14:35 UTCJul 22, 15:45 UTC1h 10m
2026-07-22 N500AF - Jul 22, 12:20 UTCJul 22, 13:50 UTC1h 30m
2026-07-21 N500AF COI → COI Jul 21, 13:50 UTCJul 21, 14:30 UTC40m
2026-07-21 N500AF COI → COI Jul 21, 12:20 UTCJul 21, 13:05 UTC45m
2026-07-20 N500AF COI → COI Jul 20, 13:55 UTCJul 20, 16:05 UTC2h 10m
2026-07-20 N500AF COI → COI Jul 20, 12:20 UTCJul 20, 13:20 UTC1h 0m
2026-07-19 N500AF COI → COI Jul 19, 13:50 UTCJul 19, 16:05 UTC2h 15m
2026-07-19 N500AF COI → COI Jul 19, 12:15 UTCJul 19, 13:20 UTC1h 5m
2026-07-17 N500AF - Jul 17, 17:05 UTCJul 17, 17:50 UTC45m
2026-07-17 N500AF COI → COI Jul 17, 15:35 UTCJul 17, 16:24 UTC50m
2026-07-17 N500AF COI → COI Jul 17, 12:25 UTCJul 17, 14:10 UTC1h 45m
2026-07-16 N500AF - Jul 16, 15:10 UTCJul 16, 16:00 UTC50m
2026-07-15 N500AF - Jul 15, 16:35 UTCJul 15, 17:20 UTC45m
2026-07-15 N500AF - Jul 15, 11:30 UTCJul 15, 12:20 UTC50m
2026-07-13 N500AF - Jul 13, 13:25 UTCJul 13, 14:00 UTC35m
2026-07-12 N500AF - Jul 12, 17:01 UTCJul 12, 18:20 UTC1h 20m
2026-07-12 N500AF - Jul 12, 13:30 UTCJul 12, 14:25 UTC55m
2026-07-11 N500AF - Jul 11, 21:55 UTCJul 11, 23:00 UTC1h 5m
2026-07-11 N500AF COI → COI Jul 11, 20:10 UTCJul 11, 21:15 UTC1h 5m
2026-07-11 N500AF - Jul 11, 02:10 UTCJul 11, 02:45 UTC35m
2026-07-11 N500AF - Jul 11, 00:40 UTCJul 11, 01:05 UTC25m
2026-07-10 N500AF COI → COI Jul 10, 18:30 UTCJul 10, 19:20 UTC50m
2026-07-09 N500AF - Jul 9, 21:30 UTCJul 10, 00:35 UTC3h 5m
2026-07-09 N500AF COI → COI Jul 9, 18:55 UTCJul 9, 19:55 UTC1h 0m
2026-07-09 N500AF COI → COI Jul 9, 13:20 UTCJul 9, 14:25 UTC1h 5m
2026-07-08 N500AF COI → COI Jul 8, 18:20 UTCJul 8, 19:00 UTC40m
2026-07-08 N500AF - Jul 8, 17:20 UTCJul 8, 17:45 UTC25m
2026-07-08 N500AF - Jul 8, 15:35 UTCJul 8, 16:15 UTC40m
2026-07-08 N500AF - Jul 8, 13:00 UTCJul 8, 13:50 UTC50m
2026-07-07 N500AF - Jul 7, 20:00 UTCJul 7, 21:25 UTC1h 25m
2026-07-07 N500AF - Jul 7, 17:15 UTCJul 7, 17:50 UTC35m
2026-07-07 N500AF - Jul 7, 14:20 UTCJul 7, 15:35 UTC1h 15m
2026-07-06 N500AF COI → COI Jul 6, 18:50 UTCJul 6, 19:40 UTC50m
2026-07-06 N500AF COI → COI Jul 6, 16:50 UTCJul 6, 17:50 UTC1h 0m
2026-07-06 N500AF - Jul 6, 01:05 UTCJul 6, 03:25 UTC2h 20m
2026-07-05 N500AF - Jul 5, 15:30 UTCJul 5, 16:25 UTC55m
2026-07-03 N500AF COI → COI Jul 3, 18:45 UTCJul 3, 21:10 UTC2h 25m
2026-07-03 N500AF - Jul 3, 17:10 UTCJul 3, 18:10 UTC1h 0m
2026-07-03 N500AF - Jul 3, 15:25 UTCJul 3, 16:40 UTC1h 15m

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 N500AF page for operator, model, and routing details .

Mode-S A639F6 frequently asked

What is Mode-S code A639F6?
A639F6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N500AF.
Where is Mode-S A639F6 registered?
Mode-S code A639F6 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 A639F6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A639F6, octal 51434766, decimal 10,893,814.
What flights does A639F6 operate?
Mode-S A639F6 has broadcast 1 distinct callsign, including N500AF.