Apparatus

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sensors Mode-S transponder

A28B91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N263QS · BOMBARDIER CL-600 Challenger · operated by BRODER TRANSPORT LLC, ARMBRESTER BRADFORD K, CEGG LLC, SENSKE CHRISTOPHER, DUKE ORGANIZATION LLC, TRABOLD FRANK R

Hex
A28B91
Octal
50505621
Decimal
10,652,561
Country
US
Tail
N263QS
Type
CL60
No current signal · last broadcast 5d ago
Flights observed
136
Distinct callsigns
2
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A28B91.

Country allocation

The ICAO 24-bit address A28B91 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
EJA263 - 113 2026-07-09
N263QS - 23 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-09 EJA263 - Jul 9, 23:30 UTCJul 10, 00:40 UTC1h 10m
2026-07-09 N263QS - Jul 9, 16:50 UTCJul 9, 22:15 UTC5h 25m
2026-07-08 N263QS - Jul 8, 13:15 UTCJul 8, 14:30 UTC1h 15m
2026-07-07 EJA263 - Jul 7, 22:05 UTCJul 7, 23:20 UTC1h 15m
2026-07-07 EJA263 YYZ → CLE Jul 7, 20:20 UTCJul 7, 21:05 UTC45m
2026-07-07 EJA263 ORL → YYZ Jul 7, 16:55 UTCJul 7, 19:15 UTC2h 20m
2026-07-07 EJA263 - Jul 7, 15:20 UTCJul 7, 15:55 UTC35m
2026-07-05 N263QS - Jul 5, 22:15 UTCJul 5, 22:40 UTC25m
2026-07-02 N263QS - Jul 2, 13:30 UTCJul 2, 13:50 UTC20m
2026-07-01 EJA263 TMB → MIA Jul 1, 22:40 UTCJul 1, 22:50 UTC10m
2026-07-01 EJA263 - Jul 1, 16:30 UTCJul 1, 20:25 UTC3h 55m
2026-06-30 EJA263 - Jun 30, 16:25 UTCJun 30, 18:15 UTC1h 50m
2026-06-30 EJA263 - Jun 30, 13:10 UTCJun 30, 15:00 UTC1h 50m
2026-06-28 EJA263 - Jun 28, 17:55 UTCJun 28, 18:44 UTC50m
2026-06-28 EJA263 - Jun 28, 13:59 UTCJun 28, 15:29 UTC1h 30m
2026-06-26 EJA263 - Jun 26, 21:10 UTCJun 26, 23:00 UTC1h 50m
2026-06-26 EJA263 - Jun 26, 18:09 UTCJun 26, 19:45 UTC1h 35m
2026-06-26 EJA263 - Jun 26, 16:39 UTCJun 26, 17:29 UTC50m
2026-06-26 EJA263 - Jun 26, 12:34 UTCJun 26, 14:55 UTC2h 20m
2026-06-25 EJA263 - Jun 25, 20:09 UTCJun 25, 21:40 UTC1h 30m
2026-06-25 EJA263 - Jun 25, 17:09 UTCJun 25, 18:00 UTC50m
2026-06-25 EJA263 - Jun 25, 15:34 UTCJun 25, 16:14 UTC40m
2026-06-25 EJA263 - Jun 25, 13:59 UTCJun 25, 14:29 UTC30m
2026-06-24 EJA263 - Jun 24, 23:29 UTCJun 25, 00:49 UTC1h 20m
2026-06-24 EJA263 - Jun 24, 20:14 UTCJun 24, 21:09 UTC55m
2026-06-24 EJA263 - Jun 24, 17:45 UTCJun 24, 18:50 UTC1h 5m
2026-06-24 EJA263 - Jun 24, 16:05 UTCJun 24, 16:29 UTC25m
2026-06-23 EJA263 - Jun 23, 22:10 UTCJun 23, 22:55 UTC45m
2026-06-23 EJA263 MSP → FCM Jun 23, 19:44 UTCJun 23, 19:55 UTC10m
2026-06-23 EJA263 - Jun 23, 16:05 UTCJun 23, 18:25 UTC2h 20m
2026-06-23 EJA263 - Jun 23, 13:24 UTCJun 23, 15:30 UTC2h 5m
2026-06-10 EJA263 BOS → BLM Jun 10, 21:20 UTCJun 11, 00:05 UTC2h 45m
2026-06-10 EJA263 BOS → BLM Jun 10, 19:05 UTCJun 10, 20:15 UTC1h 10m
2026-06-10 EJA263 BOS → BLM Jun 10, 17:00 UTCJun 10, 17:55 UTC55m
2026-06-08 EJA263 BOS → BLM Jun 8, 17:30 UTCJun 8, 18:45 UTC1h 15m
2026-06-08 EJA263 BOS → BLM Jun 8, 00:00 UTCJun 8, 01:00 UTC1h 0m
2026-06-07 EJA263 BOS → BLM Jun 7, 21:30 UTCJun 7, 22:20 UTC50m
2026-06-07 EJA263 BOS → BLM Jun 7, 14:35 UTCJun 7, 19:25 UTC4h 50m
2026-06-06 EJA263 BOS → BLM Jun 6, 17:34 UTCJun 6, 20:00 UTC2h 25m
2026-06-05 EJA263 BOS → BLM Jun 5, 14:30 UTCJun 5, 17:05 UTC2h 35m
2026-06-04 N263QS - Jun 4, 16:25 UTCJun 4, 18:20 UTC1h 55m
2026-06-03 N263QS - Jun 3, 15:25 UTCJun 3, 16:20 UTC55m
2026-06-03 EJA263 BOS → BLM Jun 3, 12:30 UTCJun 3, 13:15 UTC45m
2026-06-02 EJA263 BOS → BLM Jun 2, 21:10 UTCJun 2, 21:55 UTC45m
2026-06-01 EJA263 BOS → BLM Jun 1, 22:40 UTCJun 1, 22:55 UTC15m
2026-06-01 EJA263 BOS → BLM Jun 1, 16:15 UTCJun 1, 21:00 UTC4h 45m
2026-06-01 EJA263 BOS → BLM Jun 1, 01:35 UTCJun 1, 01:50 UTC15m
2026-05-31 EJA263 BOS → BLM May 31, 23:55 UTCJun 1, 00:35 UTC40m
2026-05-31 EJA263 BOS → BLM May 31, 17:00 UTCMay 31, 18:30 UTC1h 30m
2026-05-30 EJA263 BOS → BLM May 30, 23:05 UTCMay 30, 23:30 UTC25m

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 N263QS page for operator, model, and routing details .

Mode-S A28B91 frequently asked

What is Mode-S code A28B91?
A28B91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N263QS.
Where is Mode-S A28B91 registered?
Mode-S code A28B91 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 A28B91 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A28B91, octal 50505621, decimal 10,652,561.
What flights does A28B91 operate?
Mode-S A28B91 has broadcast 2 distinct callsigns, including EJA263, N263QS.