Apparatus

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sensors Mode-S transponder

A1AEC2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20727 · CESSNA 172 Skyhawk · operated by ATPCE LLC

Hex
A1AEC2
Octal
50327302
Decimal
10,596,034
Country
US
Tail
N20727
Type
C172
Broadcasting now · 9,150 ft
Flights observed
24
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Current position

A1AEC2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1AEC2 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
CXK163 - 24 2026-04-18

Recent flights last 24

DateFlightRouteTakeoffLandingDuration
2026-04-18 CXK163 - Apr 18, 17:35 UTCApr 18, 18:00 UTC25m
2026-04-18 CXK163 - Apr 18, 14:50 UTCApr 18, 15:35 UTC45m
2026-04-18 CXK163 - Apr 18, 12:10 UTCApr 18, 13:15 UTC1h 5m
2026-04-18 CXK163 - Apr 18, 01:25 UTCApr 18, 02:10 UTC45m
2026-04-18 CXK163 - Apr 18, 00:55 UTCApr 18, 01:20 UTC25m
2026-04-17 CXK163 PVU → PVU Apr 17, 22:05 UTCApr 17, 23:10 UTC1h 5m
2026-04-17 CXK163 - Apr 17, 19:55 UTCApr 17, 21:20 UTC1h 25m
2026-04-17 CXK163 - Apr 17, 18:30 UTCApr 17, 19:00 UTC30m
2026-04-17 CXK163 - Apr 17, 15:40 UTCApr 17, 16:00 UTC20m
2026-04-17 CXK163 - Apr 17, 13:50 UTCApr 17, 14:05 UTC15m
2026-04-17 CXK163 - Apr 17, 12:20 UTCApr 17, 12:45 UTC25m
2026-04-16 CXK163 PVU → PVU Apr 16, 03:24 UTCApr 16, 05:05 UTC1h 40m
2026-04-15 CXK163 - Apr 15, 19:05 UTCApr 15, 20:00 UTC55m
2026-04-15 CXK163 PVU → PVU Apr 15, 18:50 UTCApr 15, 19:00 UTC10m
2026-04-15 CXK163 - Apr 15, 17:05 UTCApr 15, 17:50 UTC45m
2026-04-15 CXK163 - Apr 15, 05:00 UTCApr 15, 05:25 UTC25m
2026-04-15 CXK163 - Apr 15, 03:40 UTCApr 15, 04:50 UTC1h 10m
2026-04-14 CXK163 - Apr 14, 23:00 UTCApr 14, 23:15 UTC15m
2026-04-14 CXK163 - Apr 14, 20:55 UTCApr 14, 21:15 UTC20m
2026-04-14 CXK163 - Apr 14, 20:25 UTCApr 14, 20:50 UTC25m
2026-04-14 CXK163 - Apr 14, 15:05 UTCApr 14, 15:25 UTC20m
2026-04-14 CXK163 - Apr 14, 14:50 UTCApr 14, 15:00 UTC10m
2026-04-14 CXK163 VGT → VGT Apr 14, 14:35 UTCApr 14, 14:40 UTC5m
2026-04-14 CXK163 VGT → VGT Apr 14, 14:10 UTCApr 14, 14:20 UTC10m

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 N20727 page for operator, model, and routing details .

Mode-S A1AEC2 frequently asked

What is Mode-S code A1AEC2?
A1AEC2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20727.
Where is Mode-S A1AEC2 registered?
Mode-S code A1AEC2 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 A1AEC2 broadcasting right now?
Yes. Mode-S A1AEC2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1AEC2, octal 50327302, decimal 10,596,034.
What flights does A1AEC2 operate?
Mode-S A1AEC2 has broadcast 1 distinct callsign, including CXK163.