Apparatus

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sensors Mode-S transponder

A1AE99

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20711 · CESSNA 172 Skyhawk · operated by ATPCE LLC

Hex
A1AE99
Octal
50327231
Decimal
10,595,993
Country
US
Tail
N20711
Type
C172
No current signal · last broadcast 12h ago
Flights observed
179
Distinct callsigns
1
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A1AE99.

Country allocation

The ICAO 24-bit address A1AE99 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
CXK408 - 179 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 CXK408 - Jul 18, 23:25 UTCJul 19, 00:40 UTC1h 15m
2026-07-18 CXK408 - Jul 18, 17:25 UTCJul 18, 18:55 UTC1h 30m
2026-07-16 CXK408 - Jul 16, 17:05 UTCJul 16, 18:55 UTC1h 50m
2026-07-16 CXK408 - Jul 16, 14:45 UTCJul 16, 15:14 UTC30m
2026-07-16 CXK408 - Jul 16, 12:00 UTCJul 16, 13:45 UTC1h 45m
2026-07-15 CXK408 PVU → PVU Jul 15, 18:10 UTCJul 15, 19:20 UTC1h 10m
2026-07-15 CXK408 PVU → PVU Jul 15, 14:15 UTCJul 15, 15:25 UTC1h 10m
2026-07-15 CXK408 PVU → PVU Jul 15, 11:50 UTCJul 15, 13:10 UTC1h 20m
2026-06-29 CXK408 PVU → PVU Jun 29, 17:19 UTCJun 29, 18:55 UTC1h 35m
2026-06-29 CXK408 - Jun 29, 14:44 UTCJun 29, 16:10 UTC1h 25m
2026-06-28 CXK408 - Jun 28, 16:19 UTCJun 28, 18:05 UTC1h 45m
2026-06-27 CXK408 PVU → PVU Jun 27, 14:35 UTCJun 27, 16:04 UTC1h 30m
2026-06-27 CXK408 - Jun 27, 11:39 UTCJun 27, 13:24 UTC1h 45m
2026-06-26 CXK408 - Jun 26, 11:20 UTCJun 26, 12:44 UTC1h 25m
2026-06-25 CXK408 PVU → PVU Jun 25, 17:25 UTCJun 25, 18:34 UTC1h 10m
2026-06-25 CXK408 PVU → PVU Jun 25, 15:20 UTCJun 25, 16:20 UTC1h 0m
2026-06-25 CXK408 PVU → PVU Jun 25, 12:35 UTCJun 25, 14:09 UTC1h 35m
2026-06-24 CXK408 PVU → PVU Jun 24, 20:05 UTCJun 24, 22:00 UTC1h 55m
2026-06-24 CXK408 PVU → PVU Jun 24, 17:59 UTCJun 24, 19:10 UTC1h 10m
2026-06-24 CXK408 - Jun 24, 14:50 UTCJun 24, 15:09 UTC20m
2026-06-24 CXK408 - Jun 24, 12:14 UTCJun 24, 12:40 UTC25m
2026-06-23 CXK408 PVU → PVU Jun 23, 20:10 UTCJun 23, 20:29 UTC20m
2026-06-23 CXK408 - Jun 23, 14:10 UTCJun 23, 14:25 UTC15m
2026-06-23 CXK408 - Jun 23, 11:54 UTCJun 23, 12:45 UTC50m
2026-06-22 CXK408 - Jun 22, 13:35 UTCJun 22, 13:59 UTC25m
2026-06-22 CXK408 - Jun 22, 11:50 UTCJun 22, 12:25 UTC35m
2026-06-19 CXK408 - Jun 19, 06:04 UTCJun 19, 06:54 UTC50m
2026-06-19 CXK408 - Jun 19, 05:45 UTCJun 19, 05:59 UTC15m
2026-06-19 CXK408 PVU → PVU Jun 19, 04:00 UTCJun 19, 05:40 UTC1h 40m
2026-06-18 CXK408 PVU → PVU Jun 18, 21:40 UTCJun 18, 23:00 UTC1h 20m
2026-06-18 CXK408 - Jun 18, 16:45 UTCJun 18, 18:10 UTC1h 25m
2026-06-18 CXK408 - Jun 18, 15:00 UTCJun 18, 15:45 UTC45m
2026-06-18 CXK408 - Jun 18, 13:35 UTCJun 18, 14:01 UTC25m
2026-06-18 CXK408 - Jun 18, 12:00 UTCJun 18, 12:25 UTC25m
2026-06-17 CXK408 PVU → PVU Jun 17, 11:40 UTCJun 17, 13:40 UTC2h 0m
2026-06-16 CXK408 PVU → PVU Jun 16, 17:59 UTCJun 16, 19:35 UTC1h 35m
2026-06-16 CXK408 - Jun 16, 16:35 UTCJun 16, 16:55 UTC20m
2026-06-16 CXK408 - Jun 16, 14:35 UTCJun 16, 14:55 UTC20m
2026-06-16 CXK408 - Jun 16, 13:09 UTCJun 16, 13:40 UTC30m
2026-06-16 CXK408 - Jun 16, 01:55 UTCJun 16, 02:15 UTC20m
2026-06-15 CXK408 - Jun 15, 23:30 UTCJun 15, 23:54 UTC25m
2026-06-15 CXK408 - Jun 15, 15:59 UTCJun 15, 16:35 UTC35m
2026-06-15 CXK408 - Jun 15, 14:55 UTCJun 15, 15:15 UTC20m
2026-06-15 CXK408 PVU → PVU Jun 15, 11:34 UTCJun 15, 13:45 UTC2h 10m
2026-06-11 CXK408 PVU → PVU Jun 11, 22:25 UTCJun 11, 22:45 UTC20m
2026-06-11 CXK408 - Jun 11, 19:35 UTCJun 11, 19:55 UTC20m
2026-06-11 CXK408 - Jun 11, 17:35 UTCJun 11, 17:55 UTC20m
2026-06-11 CXK408 PVU → PVU Jun 11, 15:25 UTCJun 11, 16:25 UTC1h 0m
2026-06-10 CXK408 PVU → PVU Jun 10, 20:40 UTCJun 10, 22:20 UTC1h 40m
2026-06-10 CXK408 PVU → PVU Jun 10, 17:55 UTCJun 10, 18:55 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 N20711 page for operator, model, and routing details .

Mode-S A1AE99 frequently asked

What is Mode-S code A1AE99?
A1AE99 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20711.
Where is Mode-S A1AE99 registered?
Mode-S code A1AE99 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 A1AE99 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1AE99, octal 50327231, decimal 10,595,993.
What flights does A1AE99 operate?
Mode-S A1AE99 has broadcast 1 distinct callsign, including CXK408.