Apparatus

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sensors Mode-S transponder

A3FB5B

ICAO 24-bit transponder address · allocated to United States

Hex
A3FB5B
Octal
50775533
Decimal
10,746,715
Country
US
No current signal · last broadcast 6h ago
Flights observed
123
Distinct callsigns
1
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A3FB5B.

Country allocation

The ICAO 24-bit address A3FB5B 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
N356CT - 123 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N356CT - Jul 17, 19:15 UTCJul 17, 20:20 UTC1h 5m
2026-07-17 N356CT - Jul 17, 16:49 UTCJul 17, 17:44 UTC55m
2026-07-16 N356CT - Jul 16, 15:49 UTCJul 16, 16:30 UTC40m
2026-07-15 N356CT - Jul 15, 21:45 UTCJul 15, 23:45 UTC2h 0m
2026-07-15 N356CT - Jul 15, 19:35 UTCJul 15, 21:10 UTC1h 35m
2026-07-14 N356CT - Jul 14, 15:15 UTCJul 14, 16:20 UTC1h 5m
2026-07-13 N356CT MYF → MYF Jul 13, 22:35 UTCJul 14, 00:15 UTC1h 40m
2026-07-10 N356CT - Jul 10, 21:35 UTCJul 10, 23:10 UTC1h 35m
2026-07-10 N356CT MYF → MYF Jul 10, 18:05 UTCJul 10, 19:35 UTC1h 30m
2026-07-10 N356CT MYF → MYF Jul 10, 16:30 UTCJul 10, 17:05 UTC35m
2026-07-08 N356CT - Jul 8, 22:55 UTCJul 9, 00:50 UTC1h 55m
2026-07-07 N356CT - Jul 7, 16:25 UTCJul 7, 19:35 UTC3h 10m
2026-07-06 N356CT - Jul 6, 22:30 UTCJul 6, 23:50 UTC1h 20m
2026-07-06 N356CT - Jul 6, 16:30 UTCJul 6, 17:15 UTC45m
2026-07-05 N356CT MYF → MYF Jul 5, 03:45 UTCJul 5, 04:45 UTC1h 0m
2026-07-04 N356CT - Jul 4, 20:30 UTCJul 4, 21:05 UTC35m
2026-07-03 N356CT MYF → MYF Jul 3, 16:20 UTCJul 3, 18:00 UTC1h 40m
2026-07-02 N356CT - Jul 2, 23:10 UTCJul 2, 23:45 UTC35m
2026-07-02 N356CT SBD → HMT Jul 2, 22:45 UTCJul 2, 23:00 UTC15m
2026-07-02 N356CT MYF → SBD Jul 2, 21:50 UTCJul 2, 22:40 UTC50m
2026-07-02 N356CT - Jul 2, 17:20 UTCJul 2, 18:05 UTC45m
2026-07-01 N356CT - Jul 1, 19:55 UTCJul 1, 21:40 UTC1h 45m
2026-07-01 N356CT - Jul 1, 02:00 UTCJul 1, 03:00 UTC1h 0m
2026-07-01 N356CT - Jul 1, 00:50 UTCJul 1, 01:45 UTC55m
2026-06-30 N356CT - Jun 30, 18:05 UTCJun 30, 18:50 UTC45m
2026-06-30 N356CT MYF → OCN Jun 30, 16:50 UTCJun 30, 17:20 UTC30m
2026-06-29 N356CT OCN → MYF Jun 29, 22:59 UTCJun 29, 23:34 UTC35m
2026-06-29 N356CT OCN → OCN Jun 29, 22:39 UTCJun 29, 22:55 UTC15m
2026-06-29 N356CT OCN → OCN Jun 29, 22:24 UTCJun 29, 22:35 UTC10m
2026-06-29 N356CT - Jun 29, 22:05 UTCJun 29, 22:19 UTC15m
2026-06-29 N356CT MYF → MYF Jun 29, 17:59 UTCJun 29, 19:09 UTC1h 10m
2026-06-27 N356CT - Jun 27, 17:34 UTCJun 27, 18:49 UTC1h 15m
2026-06-19 N356CT SBD → MYF Jun 19, 22:19 UTCJun 19, 23:19 UTC1h 0m
2026-06-19 N356CT - Jun 19, 21:14 UTCJun 19, 21:54 UTC40m
2026-06-19 N356CT - Jun 19, 01:10 UTCJun 19, 02:19 UTC1h 10m
2026-06-18 N356CT - Jun 18, 18:50 UTCJun 18, 20:05 UTC1h 15m
2026-06-18 N356CT - Jun 18, 16:05 UTCJun 18, 17:10 UTC1h 5m
2026-06-18 N356CT MYF → MYF Jun 18, 02:10 UTCJun 18, 04:05 UTC1h 55m
2026-06-17 N356CT - Jun 17, 19:05 UTCJun 17, 21:40 UTC2h 35m
2026-06-16 N356CT - Jun 16, 15:35 UTCJun 16, 16:39 UTC1h 5m
2026-06-16 N356CT MYF → MYF Jun 16, 00:45 UTCJun 16, 02:00 UTC1h 15m
2026-06-15 N356CT - Jun 15, 21:55 UTCJun 15, 23:54 UTC2h 0m
2026-06-15 N356CT - Jun 15, 18:50 UTCJun 15, 19:45 UTC55m
2026-06-10 N356CT - Jun 10, 22:45 UTCJun 11, 00:05 UTC1h 20m
2026-06-10 N356CT MYF → MYF Jun 10, 20:10 UTCJun 10, 20:45 UTC35m
2026-06-10 N356CT - Jun 10, 15:45 UTCJun 10, 17:40 UTC1h 55m
2026-06-08 N356CT - Jun 8, 21:20 UTCJun 8, 23:05 UTC1h 45m
2026-06-08 N356CT NKX → MYF Jun 8, 18:25 UTCJun 8, 19:40 UTC1h 15m
2026-06-07 N356CT MYF → MYF Jun 7, 17:40 UTCJun 7, 19:15 UTC1h 35m
2026-06-06 N356CT - Jun 6, 18:29 UTCJun 6, 19:24 UTC55m

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.

Mode-S A3FB5B frequently asked

What is Mode-S code A3FB5B?
A3FB5B is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A3FB5B registered?
Mode-S code A3FB5B 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 A3FB5B broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3FB5B, octal 50775533, decimal 10,746,715.
What flights does A3FB5B operate?
Mode-S A3FB5B has broadcast 1 distinct callsign, including N356CT.