Apparatus

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sensors Mode-S transponder

AB1FEA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N816CT · CIRRUS SR-20 · operated by SIX CT LLC

Hex
AB1FEA
Octal
52617752
Decimal
11,214,826
Country
US
Tail
N816CT
Type
SR20
No current signal · last broadcast 1d ago
Flights observed
46
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AB1FEA.

Country allocation

The ICAO 24-bit address AB1FEA 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
N816CT - 46 2026-07-17

Recent flights last 46

DateFlightRouteTakeoffLandingDuration
2026-07-17 N816CT PAO → PAO Jul 17, 00:55 UTCJul 17, 02:20 UTC1h 25m
2026-07-12 N816CT - Jul 12, 20:25 UTCJul 12, 20:30 UTC5m
2026-07-12 N816CT PAO → PAO Jul 12, 19:40 UTCJul 12, 20:15 UTC35m
2026-07-11 N816CT PAO → PAO Jul 11, 00:25 UTCJul 11, 02:25 UTC2h 0m
2026-07-06 N816CT PAO → PAO Jul 6, 01:40 UTCJul 6, 03:30 UTC1h 50m
2026-07-04 N816CT PAO → PAO Jul 4, 00:55 UTCJul 4, 01:35 UTC40m
2026-07-03 N816CT PAO → PAO Jul 3, 22:20 UTCJul 3, 22:25 UTC5m
2026-07-03 N816CT PAO → PAO Jul 3, 21:10 UTCJul 3, 22:15 UTC1h 5m
2026-07-03 N816CT PAO → PAO Jul 3, 15:30 UTCJul 3, 17:20 UTC1h 50m
2026-06-29 N816CT PAO → PAO Jun 29, 00:24 UTCJun 29, 00:54 UTC30m
2026-06-28 N816CT PAO → PAO Jun 28, 17:34 UTCJun 28, 18:14 UTC40m
2026-06-26 N816CT PAO → PAO Jun 26, 14:29 UTCJun 26, 15:39 UTC1h 10m
2026-06-24 N816CT PAO → PAO Jun 24, 20:54 UTCJun 24, 21:54 UTC1h 0m
2026-06-24 N816CT - Jun 24, 03:10 UTCJun 24, 03:35 UTC25m
2026-06-23 N816CT - Jun 23, 18:50 UTCJun 23, 19:19 UTC30m
2026-06-22 N816CT PAO → PAO Jun 22, 02:14 UTCJun 22, 02:50 UTC35m
2026-06-21 N816CT PAO → PAO Jun 21, 18:54 UTCJun 21, 19:00 UTC5m
2026-06-21 N816CT PAO → PAO Jun 21, 18:35 UTCJun 21, 18:44 UTC10m
2026-06-21 N816CT PAO → PAO Jun 21, 18:20 UTCJun 21, 18:29 UTC10m
2026-06-21 N816CT PAO → PAO Jun 21, 18:10 UTCJun 21, 18:14 UTC5m
2026-06-21 N816CT - Jun 21, 05:59 UTCJun 21, 06:40 UTC40m
2026-06-21 N816CT - Jun 21, 05:40 UTCJun 21, 05:54 UTC15m
2026-06-21 N816CT PAO → SMF Jun 21, 04:39 UTCJun 21, 05:35 UTC55m
2026-06-19 N816CT - Jun 19, 20:34 UTCJun 19, 20:40 UTC5m
2026-06-19 N816CT PAO → PAO Jun 19, 20:19 UTCJun 19, 20:29 UTC10m
2026-06-19 N816CT - Jun 19, 20:04 UTCJun 19, 20:14 UTC10m
2026-06-19 N816CT PAO → PAO Jun 19, 19:49 UTCJun 19, 19:54 UTC5m
2026-06-19 N816CT PAO → PAO Jun 19, 19:29 UTCJun 19, 19:34 UTC5m
2026-06-19 N816CT PAO → PAO Jun 19, 14:34 UTCJun 19, 15:29 UTC55m
2026-06-14 N816CT - Jun 14, 23:44 UTCJun 15, 00:05 UTC20m
2026-06-14 N816CT - Jun 14, 22:20 UTCJun 14, 23:29 UTC1h 10m
2026-06-13 N816CT PAO → PAO Jun 13, 23:40 UTCJun 14, 00:25 UTC45m
2026-06-13 N816CT - Jun 13, 21:20 UTCJun 13, 22:15 UTC55m
2026-06-13 N816CT MHR → UKI Jun 13, 19:00 UTCJun 13, 20:00 UTC1h 0m
2026-06-13 N816CT PAO → MHR Jun 13, 17:00 UTCJun 13, 18:50 UTC1h 50m
2026-06-13 N816CT SQL → PAO Jun 13, 00:15 UTCJun 13, 00:25 UTC10m
2026-06-12 N816CT PAO → SQL Jun 12, 23:30 UTCJun 13, 00:10 UTC40m
2026-06-10 N816CT SJC → PAO Jun 10, 18:25 UTCJun 10, 18:55 UTC30m
2026-05-19 N816CT PAO → SJC May 19, 14:40 UTCMay 19, 14:50 UTC10m
2026-05-14 N816CT PAO → PAO May 14, 15:40 UTCMay 14, 15:45 UTC5m
2026-05-04 N816CT - May 4, 01:44 UTCMay 4, 02:04 UTC20m
2026-05-03 N816CT - May 3, 23:39 UTCMay 4, 01:10 UTC1h 30m
2026-05-03 N816CT - May 3, 18:20 UTCMay 3, 21:10 UTC2h 50m
2026-05-02 N816CT - May 2, 21:40 UTCMay 2, 22:35 UTC55m
2026-05-02 N816CT - May 2, 20:00 UTCMay 2, 21:05 UTC1h 5m
2026-05-01 N816CT CCB → POC May 1, 22:10 UTCMay 2, 00:35 UTC2h 25m

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 N816CT page for operator, model, and routing details .

Mode-S AB1FEA frequently asked

What is Mode-S code AB1FEA?
AB1FEA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N816CT.
Where is Mode-S AB1FEA registered?
Mode-S code AB1FEA 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 AB1FEA 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 AB1FEA, octal 52617752, decimal 11,214,826.
What flights does AB1FEA operate?
Mode-S AB1FEA has broadcast 1 distinct callsign, including N816CT.