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sensors Mode-S transponder

A66FA9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5135P · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A66FA9
Octal
51467651
Decimal
10,907,561
Country
US
Tail
N5135P
Type
C172
No current signal · last broadcast Jul 25, 12:35 UTC
Flights observed
238
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 12:35 UTC

Last known position

Most recent position reported by Mode-S A66FA9.

Country allocation

The ICAO 24-bit address A66FA9 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
BPX204 - 238 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 BPX204 - Jul 25, 11:55 UTCJul 25, 12:35 UTC40m
2026-07-24 BPX204 - Jul 24, 19:40 UTCJul 24, 20:40 UTC1h 0m
2026-07-24 BPX204 SRQ → HWO Jul 24, 14:55 UTCJul 24, 17:05 UTC2h 10m
2026-07-24 BPX204 - Jul 24, 12:00 UTCJul 24, 13:35 UTC1h 35m
2026-07-23 BPX204 HWO → HWO Jul 23, 19:40 UTCJul 23, 20:40 UTC1h 0m
2026-07-23 BPX204 HWO → HWO Jul 23, 17:55 UTCJul 23, 18:50 UTC55m
2026-07-23 BPX204 - Jul 23, 15:45 UTCJul 23, 16:50 UTC1h 5m
2026-07-23 BPX204 - Jul 23, 13:30 UTCJul 23, 14:35 UTC1h 5m
2026-07-22 BPX204 - Jul 22, 19:35 UTCJul 22, 20:40 UTC1h 5m
2026-07-22 BPX204 - Jul 22, 17:40 UTCJul 22, 18:45 UTC1h 5m
2026-07-22 BPX204 HWO → HWO Jul 22, 15:45 UTCJul 22, 16:35 UTC50m
2026-07-22 BPX204 - Jul 22, 13:35 UTCJul 22, 14:35 UTC1h 0m
2026-07-21 BPX204 HWO → HWO Jul 21, 21:45 UTCJul 21, 22:50 UTC1h 5m
2026-07-21 BPX204 - Jul 21, 15:45 UTCJul 21, 16:45 UTC1h 0m
2026-07-21 BPX204 - Jul 21, 13:50 UTCJul 21, 14:25 UTC35m
2026-07-21 BPX204 - Jul 21, 12:00 UTCJul 21, 12:35 UTC35m
2026-07-20 BPX204 - Jul 20, 19:40 UTCJul 20, 20:30 UTC50m
2026-07-20 BPX204 HWO → HWO Jul 20, 13:35 UTCJul 20, 14:45 UTC1h 10m
2026-07-18 BPX204 HWO → HWO Jul 18, 11:30 UTCJul 18, 12:40 UTC1h 10m
2026-07-17 BPX204 HWO → HWO Jul 17, 17:20 UTCJul 17, 18:34 UTC1h 15m
2026-07-17 BPX204 - Jul 17, 15:35 UTCJul 17, 16:34 UTC1h 0m
2026-07-17 BPX204 - Jul 17, 11:00 UTCJul 17, 13:00 UTC2h 0m
2026-07-16 BPX204 - Jul 16, 20:49 UTCJul 16, 21:05 UTC15m
2026-07-16 BPX204 - Jul 16, 17:00 UTCJul 16, 17:10 UTC10m
2026-07-16 BPX204 - Jul 16, 15:49 UTCJul 16, 16:00 UTC10m
2026-07-16 BPX204 - Jul 16, 13:34 UTCJul 16, 14:10 UTC35m
2026-07-16 BPX204 - Jul 16, 12:30 UTCJul 16, 13:00 UTC30m
2026-07-15 BPX204 - Jul 15, 16:20 UTCJul 15, 17:50 UTC1h 30m
2026-07-15 BPX204 - Jul 15, 12:10 UTCJul 15, 13:50 UTC1h 40m
2026-07-14 BPX204 - Jul 14, 17:15 UTCJul 14, 17:45 UTC30m
2026-07-14 BPX204 - Jul 14, 15:10 UTCJul 14, 16:20 UTC1h 10m
2026-07-14 BPX204 - Jul 14, 12:25 UTCJul 14, 13:35 UTC1h 10m
2026-07-13 BPX204 - Jul 13, 18:20 UTCJul 13, 18:30 UTC10m
2026-07-13 BPX204 - Jul 13, 17:20 UTCJul 13, 17:50 UTC30m
2026-07-13 BPX204 - Jul 13, 13:40 UTCJul 13, 14:40 UTC1h 0m
2026-07-13 BPX204 - Jul 13, 12:25 UTCJul 13, 12:35 UTC10m
2026-07-13 BPX204 - Jul 13, 11:25 UTCJul 13, 11:35 UTC10m
2026-07-11 BPX204 - Jul 11, 15:40 UTCJul 11, 15:50 UTC10m
2026-07-11 BPX204 - Jul 11, 14:30 UTCJul 11, 14:55 UTC25m
2026-07-10 BPX204 - Jul 10, 17:20 UTCJul 10, 18:25 UTC1h 5m
2026-07-10 BPX204 - Jul 10, 13:55 UTCJul 10, 15:55 UTC2h 0m
2026-07-10 BPX204 - Jul 10, 12:00 UTCJul 10, 13:45 UTC1h 45m
2026-07-09 BPX204 - Jul 9, 22:40 UTCJul 9, 23:55 UTC1h 15m
2026-07-09 BPX204 - Jul 9, 18:10 UTCJul 9, 19:30 UTC1h 20m
2026-07-09 BPX204 - Jul 9, 14:55 UTCJul 9, 16:00 UTC1h 5m
2026-07-09 BPX204 - Jul 9, 12:40 UTCJul 9, 13:55 UTC1h 15m
2026-07-08 BPX204 - Jul 8, 22:55 UTCJul 8, 23:40 UTC45m
2026-07-06 BPX204 - Jul 6, 16:15 UTCJul 6, 16:55 UTC40m
2026-07-06 BPX204 - Jul 6, 14:00 UTCJul 6, 14:55 UTC55m
2026-07-06 BPX204 - Jul 6, 11:45 UTCJul 6, 12:45 UTC1h 0m

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 N5135P page for operator, model, and routing details .

Mode-S A66FA9 frequently asked

What is Mode-S code A66FA9?
A66FA9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5135P.
Where is Mode-S A66FA9 registered?
Mode-S code A66FA9 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 A66FA9 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 12:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A66FA9, octal 51467651, decimal 10,907,561.
What flights does A66FA9 operate?
Mode-S A66FA9 has broadcast 1 distinct callsign, including BPX204.