Apparatus

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sensors Mode-S transponder

A55CB4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4446S · AG-915 CENTURION · operated by ROTOR ADVENTURES LLC

Hex
A55CB4
Octal
51256264
Decimal
10,837,172
Country
US
Tail
N4446S
Type
GYRO
No current signal · last broadcast 19d ago
Flights observed
49
Distinct callsigns
1
Country
US
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S A55CB4.

Country allocation

The ICAO 24-bit address A55CB4 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
N4446S - 49 2026-06-24

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-06-24 N4446S - Jun 24, 16:50 UTCJun 24, 17:20 UTC30m
2026-06-24 N4446S OCN → OCN Jun 24, 14:09 UTCJun 24, 14:24 UTC15m
2026-06-24 N4446S OCN → OCN Jun 24, 00:44 UTCJun 24, 02:49 UTC2h 5m
2026-06-23 N4446S OCN → OCN Jun 23, 18:10 UTCJun 23, 18:29 UTC20m
2026-06-23 N4446S OCN → OCN Jun 23, 03:15 UTCJun 23, 03:34 UTC20m
2026-06-23 N4446S OCN → OCN Jun 23, 00:00 UTCJun 23, 00:19 UTC20m
2026-06-21 N4446S MYF → OCN Jun 21, 15:30 UTCJun 21, 16:04 UTC35m
2026-06-21 N4446S OCN → MYF Jun 21, 12:24 UTCJun 21, 14:59 UTC2h 35m
2026-06-19 N4446S OCN → OCN Jun 19, 22:39 UTCJun 19, 23:39 UTC1h 0m
2026-06-18 N4446S OCN → OCN Jun 18, 16:45 UTCJun 18, 17:30 UTC45m
2026-06-17 N4446S OCN → OCN Jun 17, 19:35 UTCJun 17, 20:40 UTC1h 5m
2026-06-17 N4446S OCN → OCN Jun 17, 14:15 UTCJun 17, 15:20 UTC1h 5m
2026-06-13 N4446S OCN → OCN Jun 13, 17:00 UTCJun 13, 17:45 UTC45m
2026-06-12 N4446S OCN → OCN Jun 12, 00:55 UTCJun 12, 01:40 UTC45m
2026-06-10 N4446S OCN → OCN Jun 10, 23:50 UTCJun 11, 00:10 UTC20m
2026-06-10 N4446S - Jun 10, 00:50 UTCJun 10, 01:30 UTC40m
2026-06-09 N4446S - Jun 9, 19:55 UTCJun 9, 20:40 UTC45m
2026-06-09 N4446S - Jun 9, 17:40 UTCJun 9, 19:00 UTC1h 20m
2026-06-09 N4446S - Jun 9, 12:20 UTCJun 9, 13:00 UTC40m
2026-06-08 N4446S OCN → OCN Jun 8, 22:35 UTCJun 8, 23:20 UTC45m
2026-06-06 N4446S CNO → OCN Jun 6, 21:54 UTCJun 6, 23:09 UTC1h 15m
2026-06-06 N4446S - Jun 6, 17:49 UTCJun 6, 18:45 UTC55m
2026-06-05 N4446S - Jun 5, 01:05 UTCJun 5, 02:00 UTC55m
2026-06-04 N4446S - Jun 4, 23:30 UTCJun 5, 00:00 UTC30m
2026-05-29 N4446S CNO → OCN May 29, 01:45 UTCMay 29, 02:55 UTC1h 10m
2026-05-28 N4446S OCN → CNO May 28, 15:05 UTCMay 28, 16:05 UTC1h 0m
2026-05-26 N4446S OCN → OCN May 26, 01:05 UTCMay 26, 01:24 UTC20m
2026-05-23 N4446S OCN → OCN May 23, 17:05 UTCMay 23, 17:25 UTC20m
2026-05-22 N4446S - May 22, 00:45 UTCMay 22, 01:05 UTC20m
2026-05-21 N4446S - May 21, 22:40 UTCMay 21, 23:05 UTC25m
2026-05-21 N4446S RBK → OCN May 21, 19:20 UTCMay 21, 19:55 UTC35m
2026-05-18 N4446S OCN → RBK May 18, 16:10 UTCMay 18, 16:45 UTC35m
2026-05-17 N4446S - May 17, 22:10 UTCMay 17, 22:30 UTC20m
2026-05-17 N4446S - May 17, 20:55 UTCMay 17, 21:35 UTC40m
2026-05-17 N4446S - May 17, 18:55 UTCMay 17, 19:20 UTC25m
2026-05-17 N4446S - May 17, 16:25 UTCMay 17, 16:45 UTC20m
2026-05-15 N4446S OCN → OCN May 15, 21:40 UTCMay 15, 22:45 UTC1h 5m
2026-05-09 N4446S - May 9, 21:40 UTCMay 9, 23:15 UTC1h 35m
2026-05-09 N4446S - May 9, 17:55 UTCMay 9, 18:55 UTC1h 0m
2026-05-04 N4446S OCN → OCN May 4, 01:00 UTCMay 4, 01:24 UTC25m
2026-05-03 N4446S OCN → OCN May 3, 16:34 UTCMay 3, 16:55 UTC20m
2026-05-02 N4446S OCN → OCN May 2, 04:35 UTCMay 2, 05:05 UTC30m
2026-05-01 N4446S OCN → OCN May 1, 20:55 UTCMay 1, 22:05 UTC1h 10m
2026-04-30 N4446S OCN → OCN Apr 30, 23:25 UTCMay 1, 01:20 UTC1h 55m
2026-04-30 N4446S OCN → OCN Apr 30, 21:40 UTCApr 30, 22:45 UTC1h 5m
2026-04-30 N4446S OCN → OCN Apr 30, 16:00 UTCApr 30, 17:20 UTC1h 20m
2026-04-28 N4446S - Apr 28, 00:45 UTCApr 28, 01:55 UTC1h 10m
2026-04-23 N4446S - Apr 23, 00:05 UTCApr 23, 00:25 UTC20m
2026-04-22 N4446S - Apr 22, 22:50 UTCApr 22, 23:10 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 N4446S page for operator, model, and routing details .

Mode-S A55CB4 frequently asked

What is Mode-S code A55CB4?
A55CB4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4446S.
Where is Mode-S A55CB4 registered?
Mode-S code A55CB4 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 A55CB4 broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55CB4, octal 51256264, decimal 10,837,172.
What flights does A55CB4 operate?
Mode-S A55CB4 has broadcast 1 distinct callsign, including N4446S.