Apparatus

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sensors Mode-S transponder

A20EF0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N23122 · operated by ATP AIRCRAFT 1 LLC

Hex
A20EF0
Octal
50407360
Decimal
10,620,656
Country
US
Tail
N23122
Type
C172
No current signal · last broadcast 1d ago
Flights observed
120
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A20EF0.

Country allocation

The ICAO 24-bit address A20EF0 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
CXK542 - 119 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CXK542 SGR → SGR Jul 12, 16:05 UTCJul 12, 17:01 UTC55m
2026-07-09 CXK542 - Jul 9, 20:00 UTCJul 9, 20:50 UTC50m
2026-07-09 CXK542 - Jul 9, 14:20 UTCJul 9, 16:35 UTC2h 15m
2026-07-09 CXK542 - Jul 9, 12:20 UTCJul 9, 13:20 UTC1h 0m
2026-07-08 CXK542 - Jul 8, 16:25 UTCJul 8, 17:10 UTC45m
2026-07-07 CXK542 - Jul 7, 19:05 UTCJul 7, 19:15 UTC10m
2026-07-06 CXK542 - Jul 6, 17:50 UTCJul 6, 18:55 UTC1h 5m
2026-07-06 CXK542 SGR → SGR Jul 6, 13:50 UTCJul 6, 14:30 UTC40m
2026-07-06 CXK542 - Jul 6, 12:55 UTCJul 6, 13:15 UTC20m
2026-07-05 CXK542 - Jul 5, 19:05 UTCJul 5, 20:05 UTC1h 0m
2026-07-04 CXK542 - Jul 4, 22:00 UTCJul 4, 23:25 UTC1h 25m
2026-07-04 CXK542 - Jul 4, 20:25 UTCJul 4, 20:35 UTC10m
2026-07-04 CXK542 - Jul 4, 19:35 UTCJul 4, 19:45 UTC10m
2026-07-04 CXK542 - Jul 4, 15:45 UTCJul 4, 17:10 UTC1h 25m
2026-07-03 CXK542 - Jul 3, 21:55 UTCJul 3, 23:20 UTC1h 25m
2026-07-03 CXK542 - Jul 3, 16:55 UTCJul 3, 17:20 UTC25m
2026-07-03 CXK542 - Jul 3, 11:35 UTCJul 3, 12:30 UTC55m
2026-07-01 CXK542 - Jul 1, 19:25 UTCJul 1, 19:55 UTC30m
2026-06-30 CXK542 - Jun 30, 22:40 UTCJun 30, 23:40 UTC1h 0m
2026-06-30 CXK542 - Jun 30, 21:55 UTCJun 30, 22:05 UTC10m
2026-06-29 CXK542 - Jun 29, 23:39 UTCJun 30, 00:49 UTC1h 10m
2026-06-28 CXK542 - Jun 28, 18:44 UTCJun 28, 20:09 UTC1h 25m
2026-06-26 CXK542 - Jun 26, 00:30 UTCJun 26, 01:45 UTC1h 15m
2026-06-24 CXK542 - Jun 24, 21:29 UTCJun 24, 22:45 UTC1h 15m
2026-06-24 CXK542 SGR → SGR Jun 24, 16:14 UTCJun 24, 17:40 UTC1h 25m
2026-06-22 CXK542 - Jun 22, 19:49 UTCJun 22, 22:54 UTC3h 5m
2026-06-19 CXK542 SGR → SGR Jun 19, 22:19 UTCJun 19, 23:34 UTC1h 15m
2026-06-19 CXK542 - Jun 19, 00:45 UTCJun 19, 01:10 UTC25m
2026-06-18 CXK542 - Jun 18, 16:35 UTCJun 18, 17:35 UTC1h 0m
2026-06-13 CXK542 - Jun 13, 19:00 UTCJun 13, 20:40 UTC1h 40m
2026-06-13 CXK542 - Jun 13, 14:00 UTCJun 13, 14:40 UTC40m
2026-06-12 CXK542 - Jun 12, 21:15 UTCJun 12, 21:35 UTC20m
2026-06-12 CXK542 - Jun 12, 19:20 UTCJun 12, 20:00 UTC40m
2026-06-11 CXK542 - Jun 11, 15:40 UTCJun 11, 18:00 UTC2h 20m
2026-06-10 CXK542 - Jun 10, 23:45 UTCJun 11, 00:30 UTC45m
2026-06-10 CXK542 - Jun 10, 21:20 UTCJun 10, 22:55 UTC1h 35m
2026-06-10 CXK542 - Jun 10, 15:55 UTCJun 10, 18:05 UTC2h 10m
2026-06-10 CXK542 SGR → SGR Jun 10, 11:40 UTCJun 10, 12:25 UTC45m
2026-06-10 CXK542 - Jun 10, 00:55 UTCJun 10, 01:40 UTC45m
2026-06-09 CXK542 - Jun 9, 21:50 UTCJun 9, 23:15 UTC1h 25m
2026-06-09 CXK542 - Jun 9, 19:00 UTCJun 9, 19:35 UTC35m
2026-06-09 CXK542 - Jun 9, 16:45 UTCJun 9, 17:05 UTC20m
2026-06-09 CXK542 - Jun 9, 15:10 UTCJun 9, 15:45 UTC35m
2026-06-09 CXK542 - Jun 9, 12:55 UTCJun 9, 13:50 UTC55m
2026-06-09 CXK542 SGR → SGR Jun 9, 11:05 UTCJun 9, 12:00 UTC55m
2026-06-08 CXK542 - Jun 8, 11:55 UTCJun 8, 14:35 UTC2h 40m
2026-06-07 CXK542 - Jun 7, 22:20 UTCJun 7, 23:30 UTC1h 10m
2026-06-03 CXK542 - Jun 3, 16:20 UTCJun 3, 17:45 UTC1h 25m
2026-05-29 CXK542 - May 29, 20:55 UTCMay 29, 21:15 UTC20m
2026-05-29 CXK542 - May 29, 19:40 UTCMay 29, 20:00 UTC20m

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 N23122 page for operator, model, and routing details .

Mode-S A20EF0 frequently asked

What is Mode-S code A20EF0?
A20EF0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N23122.
Where is Mode-S A20EF0 registered?
Mode-S code A20EF0 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 A20EF0 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A20EF0, octal 50407360, decimal 10,620,656.
What flights does A20EF0 operate?
Mode-S A20EF0 has broadcast 1 distinct callsign, including CXK542.