Apparatus

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sensors Mode-S transponder

A68CA6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N521AA · CESSNA 525B Citation CJ3 · operated by ONE ALPHA ALPHA LLC

Hex
A68CA6
Octal
51506246
Decimal
10,914,982
Country
US
Tail
N521AA
Type
C25B
No current signal · last broadcast 1d ago
Flights observed
79
Distinct callsigns
2
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A68CA6.

Country allocation

The ICAO 24-bit address A68CA6 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 2 distinct

Callsign Airline Flights Last seen
PXT521 - 77 2026-07-16
N521AA - 2 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 PXT521 - Jul 16, 21:35 UTCJul 16, 22:55 UTC1h 20m
2026-07-16 PXT521 - Jul 16, 18:55 UTCJul 16, 20:39 UTC1h 45m
2026-07-16 PXT521 - Jul 16, 16:05 UTCJul 16, 17:14 UTC1h 10m
2026-07-15 N521AA - Jul 15, 04:00 UTCJul 15, 05:05 UTC1h 5m
2026-07-14 N521AA APC → SMO Jul 14, 21:00 UTCJul 14, 22:10 UTC1h 10m
2026-07-09 PXT521 - Jul 9, 20:55 UTCJul 9, 21:30 UTC35m
2026-07-09 PXT521 - Jul 9, 19:05 UTCJul 9, 19:45 UTC40m
2026-07-07 PXT521 SJC → SJC Jul 7, 17:30 UTCJul 7, 23:15 UTC5h 45m
2026-07-07 PXT521 - Jul 7, 14:40 UTCJul 7, 15:10 UTC30m
2026-07-03 PXT521 BJC → APC Jul 3, 22:35 UTCJul 4, 01:20 UTC2h 45m
2026-07-02 PXT521 OAK → BJC Jul 2, 21:30 UTCJul 2, 23:45 UTC2h 15m
2026-07-02 PXT521 - Jul 2, 19:40 UTCJul 2, 19:55 UTC15m
2026-06-27 PXT521 HWD → APC Jun 27, 19:05 UTCJun 27, 19:19 UTC15m
2026-06-27 PXT521 - Jun 27, 16:35 UTCJun 27, 17:14 UTC40m
2026-06-27 PXT521 - Jun 27, 14:54 UTCJun 27, 15:24 UTC30m
2026-06-27 PXT521 - Jun 27, 02:55 UTCJun 27, 04:39 UTC1h 45m
2026-06-26 PXT521 OAK → BLI Jun 26, 23:55 UTCJun 27, 02:04 UTC2h 10m
2026-06-26 PXT521 - Jun 26, 21:35 UTCJun 26, 21:50 UTC15m
2026-06-20 PXT521 - Jun 20, 00:34 UTCJun 20, 01:09 UTC35m
2026-06-19 PXT521 - Jun 19, 19:54 UTCJun 19, 21:49 UTC1h 55m
2026-06-19 PXT521 - Jun 19, 15:59 UTCJun 19, 18:34 UTC2h 35m
2026-06-18 PXT521 - Jun 18, 21:20 UTCJun 18, 22:25 UTC1h 5m
2026-06-17 PXT521 - Jun 17, 22:30 UTCJun 18, 00:35 UTC2h 5m
2026-06-17 PXT521 - Jun 17, 20:55 UTCJun 17, 21:15 UTC20m
2026-06-17 PXT521 - Jun 17, 14:30 UTCJun 17, 14:50 UTC20m
2026-06-16 PXT521 - Jun 16, 22:10 UTCJun 17, 00:10 UTC2h 0m
2026-06-16 PXT521 MHR → APC Jun 16, 20:00 UTCJun 16, 20:15 UTC15m
2026-06-16 PXT521 SBA → MHR Jun 16, 18:29 UTCJun 16, 19:25 UTC55m
2026-06-16 PXT521 - Jun 16, 16:30 UTCJun 16, 16:55 UTC25m
2026-06-16 PXT521 OAK → HHR Jun 16, 00:35 UTCJun 16, 01:40 UTC1h 5m
2026-06-14 PXT521 - Jun 14, 04:45 UTCJun 14, 05:45 UTC1h 0m
2026-06-14 PXT521 OAK → MFR Jun 14, 01:25 UTCJun 14, 02:25 UTC1h 0m
2026-06-11 PXT521 COE → OAK Jun 11, 23:45 UTCJun 12, 01:45 UTC2h 1m
2026-06-11 PXT521 - Jun 11, 18:25 UTCJun 11, 20:25 UTC2h 0m
2026-06-11 PXT521 - Jun 11, 16:50 UTCJun 11, 17:15 UTC25m
2026-06-10 PXT521 LAS → APC Jun 10, 01:30 UTCJun 10, 02:55 UTC1h 25m
2026-06-09 PXT521 SFO → LAS Jun 9, 23:00 UTCJun 10, 00:10 UTC1h 10m
2026-06-08 PXT521 - Jun 8, 01:35 UTCJun 8, 02:25 UTC50m
2026-06-07 PXT521 - Jun 7, 18:55 UTCJun 7, 20:20 UTC1h 25m
2026-06-06 PXT521 - Jun 6, 20:49 UTCJun 6, 22:00 UTC1h 10m
2026-06-06 PXT521 - Jun 6, 17:05 UTCJun 6, 17:29 UTC25m
2026-06-06 PXT521 - Jun 6, 14:45 UTCJun 6, 14:59 UTC15m
2026-05-29 PXT521 SJC → OAK May 29, 04:15 UTCMay 29, 04:25 UTC10m
2026-05-28 PXT521 - May 28, 22:35 UTCMay 28, 23:05 UTC30m
2026-05-24 PXT521 LAS → APC May 24, 01:25 UTCMay 24, 02:40 UTC1h 15m
2026-05-23 PXT521 - May 23, 23:15 UTCMay 24, 00:10 UTC55m
2026-05-23 PXT521 - May 23, 21:30 UTCMay 23, 22:25 UTC55m
2026-05-22 PXT521 - May 22, 23:10 UTCMay 22, 23:40 UTC30m
2026-05-22 PXT521 - May 22, 21:05 UTCMay 22, 22:00 UTC55m
2026-05-22 PXT521 - May 22, 18:40 UTCMay 22, 19:55 UTC1h 15m

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 N521AA page for operator, model, and routing details .

Mode-S A68CA6 frequently asked

What is Mode-S code A68CA6?
A68CA6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N521AA.
Where is Mode-S A68CA6 registered?
Mode-S code A68CA6 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 A68CA6 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 A68CA6, octal 51506246, decimal 10,914,982.
What flights does A68CA6 operate?
Mode-S A68CA6 has broadcast 2 distinct callsigns, including PXT521, N521AA.