Apparatus

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sensors Mode-S transponder

A0CF55

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N151QS · BOMBARDIER BD-700 Global 6000/6500 · operated by NETJETS SALES INC, B M H REALTY LTD, BKRFLY LLC, TVPX ARS INC TRUSTEE, WILMINGTON TRUST CO TRUSTEE, WORKDAY INC

Hex
A0CF55
Octal
50147525
Decimal
10,538,837
Country
US
Tail
N151QS
Type
GLEX
No current signal · last broadcast 5h ago
Flights observed
63
Distinct callsigns
2
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A0CF55.

Country allocation

The ICAO 24-bit address A0CF55 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
EJA151 NetJets 49 2026-05-28
N151QS - 14 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 N151QS - May 29, 23:35 UTCMay 30, 00:05 UTC30m
2026-05-28 N151QS - May 28, 23:40 UTCMay 29, 05:35 UTC5h 55m
2026-05-28 EJA151 LAX → SJC May 28, 17:45 UTCMay 28, 22:25 UTC4h 40m
2026-05-28 EJA151 LAX → SJC May 28, 14:20 UTCMay 28, 16:05 UTC1h 45m
2026-05-27 EJA151 LAX → SJC May 27, 19:00 UTCMay 27, 21:00 UTC2h 0m
2026-05-27 EJA151 LAX → SJC May 27, 15:20 UTCMay 27, 15:30 UTC10m
2026-05-26 N151QS - May 26, 07:29 UTCMay 26, 16:59 UTC9h 30m
2026-05-24 N151QS - May 24, 07:05 UTCMay 24, 09:40 UTC2h 35m
2026-05-23 N151QS SUA → LBG May 23, 21:20 UTCMay 24, 05:30 UTC8h 10m
2026-05-23 EJA151 LAX → SJC May 23, 13:15 UTCMay 23, 13:30 UTC15m
2026-05-20 EJA151 LAX → SJC May 20, 22:40 UTCMay 21, 00:35 UTC1h 55m
2026-05-20 EJA151 LAX → SJC May 20, 19:45 UTCMay 20, 21:05 UTC1h 20m
2026-05-20 N151QS - May 20, 16:40 UTCMay 20, 17:25 UTC45m
2026-05-20 N151QS - May 20, 15:30 UTCMay 20, 15:40 UTC10m
2026-05-20 N151QS - May 20, 13:45 UTCMay 20, 14:00 UTC15m
2026-05-20 N151QS - May 20, 12:10 UTCMay 20, 12:45 UTC35m
2026-05-19 N151QS VCE → TEB May 19, 07:25 UTCMay 19, 15:45 UTC8h 20m
2026-05-19 N151QS - May 19, 05:30 UTCMay 19, 05:45 UTC15m
2026-05-17 N151QS - May 17, 08:15 UTCMay 17, 09:50 UTC1h 35m
2026-05-15 N151QS - May 15, 22:15 UTCMay 16, 05:15 UTC7h 0m
2026-05-14 EJA151 LAX → SJC May 14, 22:10 UTCMay 15, 00:00 UTC1h 50m
2026-05-14 EJA151 LAX → SJC May 14, 16:05 UTCMay 14, 21:05 UTC5h 0m
2026-05-13 EJA151 LAX → SJC May 13, 15:40 UTCMay 13, 20:50 UTC5h 10m
2026-05-13 EJA151 LAX → SJC May 13, 02:45 UTCMay 13, 07:10 UTC4h 25m
2026-05-13 EJA151 LAX → SJC May 13, 01:05 UTCMay 13, 01:55 UTC50m
2026-05-12 EJA151 LAX → SJC May 12, 19:00 UTCMay 12, 21:05 UTC2h 5m
2026-05-12 EJA151 LAX → SJC May 12, 14:10 UTCMay 12, 18:00 UTC3h 50m
2026-05-11 EJA151 LAX → SJC May 11, 20:35 UTCMay 11, 21:50 UTC1h 15m
2026-05-11 EJA151 LAX → SJC May 11, 19:10 UTCMay 11, 19:40 UTC30m
2026-05-11 EJA151 LAX → SJC May 11, 14:10 UTCMay 11, 15:20 UTC1h 10m
2026-05-11 EJA151 LAX → SJC May 11, 12:25 UTCMay 11, 12:55 UTC30m
2026-05-10 EJA151 LAX → SJC May 10, 20:30 UTCMay 10, 20:45 UTC15m
2026-05-10 EJA151 LAX → SJC May 10, 17:05 UTCMay 10, 19:24 UTC2h 20m
2026-05-10 EJA151 LAX → SJC May 10, 14:45 UTCMay 10, 15:19 UTC35m
2026-05-09 EJA151 LAX → SJC May 9, 20:15 UTCMay 9, 20:40 UTC25m
2026-05-09 EJA151 LAX → SJC May 9, 18:25 UTCMay 9, 19:19 UTC55m
2026-05-09 EJA151 LAX → SJC May 9, 16:05 UTCMay 9, 17:25 UTC1h 20m
2026-05-04 EJA151 LAX → SJC May 4, 22:30 UTCMay 4, 23:15 UTC45m
2026-05-04 EJA151 LAX → SJC May 4, 18:50 UTCMay 4, 21:20 UTC2h 30m
2026-05-04 EJA151 LAX → SJC May 4, 17:15 UTCMay 4, 17:25 UTC10m
2026-05-03 EJA151 LAX → SJC May 3, 21:54 UTCMay 4, 00:05 UTC2h 10m
2026-05-02 EJA151 LAX → SJC May 2, 23:55 UTCMay 3, 01:00 UTC1h 5m
2026-04-29 EJA151 LAX → SJC Apr 29, 23:35 UTCApr 30, 01:45 UTC2h 10m
2026-04-29 EJA151 LAX → SJC Apr 29, 22:05 UTCApr 29, 22:15 UTC10m
2026-04-29 EJA151 LAX → SJC Apr 29, 19:05 UTCApr 29, 19:30 UTC25m
2026-04-27 N151QS - Apr 27, 15:40 UTCApr 27, 22:10 UTC6h 30m
2026-04-20 EJA151 LAX → SJC Apr 20, 20:05 UTCApr 20, 20:45 UTC40m
2026-04-20 EJA151 LAX → SJC Apr 20, 16:05 UTCApr 20, 18:30 UTC2h 25m
2026-04-19 EJA151 LAX → SJC Apr 19, 23:35 UTCApr 19, 23:45 UTC10m
2026-04-19 EJA151 LAX → SJC Apr 19, 21:35 UTCApr 19, 22:20 UTC45m

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 N151QS page for operator, model, and routing details .

Mode-S A0CF55 frequently asked

What is Mode-S code A0CF55?
A0CF55 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N151QS.
Where is Mode-S A0CF55 registered?
Mode-S code A0CF55 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 A0CF55 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0CF55, octal 50147525, decimal 10,538,837.
What flights does A0CF55 operate?
Mode-S A0CF55 has broadcast 2 distinct callsigns, including EJA151, N151QS.