Apparatus

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sensors Mode-S transponder

A1A7DD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20564 · CESSNA 172 Skyhawk · operated by ATPCE LLC

Hex
A1A7DD
Octal
50323735
Decimal
10,594,269
Country
US
Tail
N20564
Type
C172
No current signal · last broadcast Jul 25, 22:05 UTC
Flights observed
169
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 22:05 UTC

Last known position

Most recent position reported by Mode-S A1A7DD.

Country allocation

The ICAO 24-bit address A1A7DD 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
CXK422 - 169 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CXK422 - Jul 25, 19:50 UTCJul 25, 22:05 UTC2h 15m
2026-07-25 CXK422 - Jul 25, 16:45 UTCJul 25, 17:20 UTC35m
2026-07-23 CXK422 - Jul 23, 18:55 UTCJul 23, 20:35 UTC1h 40m
2026-07-23 CXK422 - Jul 23, 16:15 UTCJul 23, 17:40 UTC1h 25m
2026-07-23 CXK422 - Jul 23, 14:30 UTCJul 23, 15:30 UTC1h 0m
2026-07-23 CXK422 FTW → FTW Jul 23, 11:40 UTCJul 23, 13:40 UTC2h 0m
2026-07-22 CXK422 - Jul 22, 21:55 UTCJul 22, 23:15 UTC1h 20m
2026-07-22 CXK422 FTW → FTW Jul 22, 19:20 UTCJul 22, 20:40 UTC1h 20m
2026-07-22 CXK422 FTW → FTW Jul 22, 12:45 UTCJul 22, 15:20 UTC2h 35m
2026-07-22 CXK422 FTW → FTW Jul 22, 11:45 UTCJul 22, 12:00 UTC15m
2026-07-21 CXK422 FTW → FTW Jul 21, 17:30 UTCJul 21, 18:25 UTC55m
2026-07-21 CXK422 FTW → FTW Jul 21, 12:50 UTCJul 21, 15:25 UTC2h 35m
2026-07-21 CXK422 FTW → FTW Jul 21, 11:50 UTCJul 21, 12:10 UTC20m
2026-07-20 CXK422 - Jul 20, 19:50 UTCJul 20, 21:10 UTC1h 20m
2026-07-20 CXK422 - Jul 20, 16:40 UTCJul 20, 17:35 UTC55m
2026-07-20 CXK422 - Jul 20, 14:05 UTCJul 20, 15:30 UTC1h 25m
2026-07-20 CXK422 FTW → FTW Jul 20, 11:15 UTCJul 20, 12:50 UTC1h 35m
2026-07-18 CXK422 - Jul 18, 19:35 UTCJul 18, 21:00 UTC1h 25m
2026-07-18 CXK422 - Jul 18, 13:55 UTCJul 18, 15:15 UTC1h 20m
2026-07-17 CXK422 - Jul 17, 21:20 UTCJul 17, 22:20 UTC1h 0m
2026-07-17 CXK422 FTW → FTW Jul 17, 19:35 UTCJul 17, 20:10 UTC35m
2026-07-15 CXK422 - Jul 15, 17:05 UTCJul 15, 18:45 UTC1h 40m
2026-07-15 CXK422 - Jul 15, 15:20 UTCJul 15, 15:40 UTC20m
2026-07-15 CXK422 FTW → FTW Jul 15, 13:00 UTCJul 15, 13:15 UTC15m
2026-07-11 CXK422 - Jul 11, 13:55 UTCJul 11, 15:30 UTC1h 35m
2026-07-11 CXK422 - Jul 11, 12:45 UTCJul 11, 13:25 UTC40m
2026-07-11 CXK422 FTW → FTW Jul 11, 11:45 UTCJul 11, 12:00 UTC15m
2026-07-10 CXK422 - Jul 10, 19:10 UTCJul 10, 20:35 UTC1h 25m
2026-07-10 CXK422 ACT → FTW Jul 10, 15:10 UTCJul 10, 15:55 UTC45m
2026-07-10 CXK422 - Jul 10, 12:35 UTCJul 10, 14:20 UTC1h 45m
2026-07-09 CXK422 - Jul 9, 19:45 UTCJul 9, 21:20 UTC1h 35m
2026-07-09 CXK422 ACT → FTW Jul 9, 15:20 UTCJul 9, 16:00 UTC40m
2026-07-09 CXK422 - Jul 9, 13:00 UTCJul 9, 14:35 UTC1h 35m
2026-07-08 CXK422 - Jul 8, 22:25 UTCJul 8, 23:45 UTC1h 20m
2026-07-08 CXK422 - Jul 8, 19:25 UTCJul 8, 21:15 UTC1h 50m
2026-07-08 CXK422 - Jul 8, 16:45 UTCJul 8, 18:00 UTC1h 15m
2026-07-08 CXK422 - Jul 8, 11:40 UTCJul 8, 14:15 UTC2h 35m
2026-07-08 CXK422 FTW → FTW Jul 8, 10:55 UTCJul 8, 11:05 UTC10m
2026-07-07 CXK422 - Jul 7, 19:50 UTCJul 7, 21:05 UTC1h 15m
2026-07-07 CXK422 FTW → FTW Jul 7, 16:35 UTCJul 7, 17:40 UTC1h 5m
2026-07-06 CXK422 - Jul 6, 18:30 UTCJul 6, 20:10 UTC1h 40m
2026-07-06 CXK422 - Jul 6, 14:10 UTCJul 6, 15:30 UTC1h 20m
2026-07-03 CXK422 - Jul 3, 17:15 UTCJul 3, 18:50 UTC1h 35m
2026-07-03 CXK422 FTW → FTW Jul 3, 14:15 UTCJul 3, 14:50 UTC35m
2026-07-03 CXK422 FTW → FTW Jul 3, 11:30 UTCJul 3, 13:10 UTC1h 40m
2026-07-02 CXK422 FTW → FTW Jul 2, 20:55 UTCJul 2, 21:35 UTC40m
2026-07-02 CXK422 - Jul 2, 16:35 UTCJul 2, 18:15 UTC1h 40m
2026-07-02 CXK422 - Jul 2, 13:40 UTCJul 2, 15:15 UTC1h 35m
2026-07-02 CXK422 FTW → FTW Jul 2, 12:15 UTCJul 2, 12:40 UTC25m
2026-07-02 CXK422 FTW → FTW Jul 2, 11:00 UTCJul 2, 11:45 UTC45m

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 N20564 page for operator, model, and routing details .

Mode-S A1A7DD frequently asked

What is Mode-S code A1A7DD?
A1A7DD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20564.
Where is Mode-S A1A7DD registered?
Mode-S code A1A7DD 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 A1A7DD broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A7DD, octal 50323735, decimal 10,594,269.
What flights does A1A7DD operate?
Mode-S A1A7DD has broadcast 1 distinct callsign, including CXK422.