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 Jul 26, 21:15 UTC
Flights observed
111
Distinct callsigns
2
Country
US
Last broadcast
Jul 26, 21:15 UTC

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 79 2026-07-26
N151QS - 32 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N151QS - Jul 26, 15:05 UTCJul 26, 21:15 UTC6h 10m
2026-07-26 EJA151 LAX → SJC Jul 26, 00:00 UTCJul 26, 01:00 UTC1h 0m
2026-07-25 EJA151 LAX → SJC Jul 25, 19:30 UTCJul 25, 23:15 UTC3h 45m
2026-07-25 EJA151 LAX → SJC Jul 25, 17:35 UTCJul 25, 17:55 UTC20m
2026-07-23 EJA151 LAX → SJC Jul 23, 20:20 UTCJul 23, 21:20 UTC1h 0m
2026-07-23 EJA151 LAX → SJC Jul 23, 17:35 UTCJul 23, 18:05 UTC30m
2026-07-22 EJA151 LAX → SJC Jul 22, 21:10 UTCJul 22, 22:00 UTC50m
2026-07-22 EJA151 LAX → SJC Jul 22, 19:20 UTCJul 22, 19:30 UTC10m
2026-07-21 EJA151 LAX → SJC Jul 21, 23:00 UTCJul 22, 02:10 UTC3h 10m
2026-07-20 EJA151 LAX → SJC Jul 20, 21:20 UTCJul 20, 23:40 UTC2h 20m
2026-07-19 EJA151 LAX → SJC Jul 19, 20:40 UTCJul 20, 00:55 UTC4h 15m
2026-07-19 EJA151 LAX → SJC Jul 19, 18:40 UTCJul 19, 19:05 UTC25m
2026-07-17 EJA151 LAX → SJC Jul 17, 21:05 UTCJul 17, 22:35 UTC1h 30m
2026-07-13 EJA151 - Jul 13, 21:10 UTCJul 14, 02:00 UTC4h 50m
2026-07-13 EJA151 IAD → HPN Jul 13, 16:25 UTCJul 13, 17:15 UTC50m
2026-07-13 EJA151 - Jul 13, 14:05 UTCJul 13, 14:55 UTC50m
2026-07-13 EJA151 - Jul 13, 12:40 UTCJul 13, 13:05 UTC25m
2026-07-13 EJA151 - Jul 13, 01:05 UTCJul 13, 01:50 UTC45m
2026-07-12 EJA151 - Jul 12, 20:55 UTCJul 12, 22:00 UTC1h 5m
2026-07-12 EJA151 - Jul 12, 17:45 UTCJul 12, 19:50 UTC2h 5m
2026-07-12 N151QS - Jul 12, 07:31 UTCJul 12, 16:01 UTC8h 30m
2026-07-11 N151QS BQH → MAD Jul 11, 11:15 UTCJul 11, 13:00 UTC1h 45m
2026-07-09 N151QS - Jul 9, 22:55 UTCJul 10, 06:40 UTC7h 45m
2026-07-08 EJA151 - Jul 8, 23:00 UTCJul 9, 00:20 UTC1h 20m
2026-07-08 EJA151 - Jul 8, 21:15 UTCJul 8, 22:05 UTC50m
2026-06-29 EJA151 - Jun 29, 21:09 UTCJun 29, 22:00 UTC50m
2026-06-19 EJA151 - Jun 19, 20:04 UTCJun 19, 21:19 UTC1h 15m
2026-06-19 EJA151 - Jun 19, 14:59 UTCJun 19, 19:04 UTC4h 5m
2026-06-19 N151QS - Jun 19, 07:29 UTCJun 19, 14:15 UTC6h 45m
2026-06-17 N151QS - Jun 17, 09:10 UTCJun 17, 13:15 UTC4h 5m
2026-06-15 N151QS - Jun 15, 22:49 UTCJun 16, 08:49 UTC10h 0m
2026-06-15 EJA151 - Jun 15, 20:15 UTCJun 15, 21:30 UTC1h 15m
2026-06-15 EJA151 - Jun 15, 14:05 UTCJun 15, 19:14 UTC5h 10m
2026-06-15 EJA151 - Jun 15, 12:45 UTCJun 15, 13:10 UTC25m
2026-06-14 N151QS - Jun 14, 18:05 UTCJun 15, 01:15 UTC7h 9m
2026-06-13 N151QS TRN → LBG Jun 13, 19:00 UTCJun 13, 20:05 UTC1h 5m
2026-06-12 N151QS - Jun 12, 14:15 UTCJun 12, 14:50 UTC35m
2026-06-12 N151QS - Jun 12, 03:30 UTCJun 12, 12:45 UTC9h 15m
2026-06-11 EJA151 - Jun 11, 16:20 UTCJun 11, 17:10 UTC50m
2026-06-10 N151QS - Jun 10, 02:30 UTCJun 10, 10:55 UTC8h 25m
2026-06-08 N151QS - Jun 8, 11:05 UTCJun 8, 18:50 UTC7h 45m
2026-06-07 N151QS - Jun 7, 13:05 UTCJun 7, 22:40 UTC9h 35m
2026-06-06 N151QS - Jun 6, 08:15 UTCJun 6, 10:14 UTC2h 0m
2026-06-05 N151QS - Jun 5, 01:10 UTCJun 5, 08:10 UTC7h 0m
2026-06-04 EJA151 LAX → SJC Jun 4, 12:00 UTCJun 4, 12:35 UTC35m
2026-06-04 EJA151 LAX → SJC Jun 4, 02:40 UTCJun 4, 06:55 UTC4h 15m
2026-05-30 N151QS - May 30, 23:50 UTCMay 31, 00:50 UTC1h 0m
2026-05-30 N151QS - May 30, 20:00 UTCMay 30, 20:10 UTC10m
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

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 Jul 26, 21:15 UTC.
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.