Apparatus

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sensors Mode-S transponder

A1BCFB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2108J · AEROSPATIALE AS-350 Ecureuil · operated by DEPARMENT OF HOMELAND SECURITY

Hex
A1BCFB
Octal
50336373
Decimal
10,599,675
Country
US
Tail
N2108J
Type
AS50
No current signal · last broadcast 24d ago
Flights observed
122
Distinct callsigns
2
Country
US
Last broadcast
24d ago

Last known position

Most recent position reported by Mode-S A1BCFB.

Country allocation

The ICAO 24-bit address A1BCFB 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
N2108J - 99 2026-06-22
N - 23 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-24 N - Jun 24, 03:55 UTCJun 24, 05:05 UTC1h 10m
2026-06-24 N - Jun 24, 03:15 UTCJun 24, 03:24 UTC10m
2026-06-22 N2108J - Jun 22, 15:45 UTCJun 22, 16:50 UTC1h 5m
2026-06-22 N2108J - Jun 22, 01:05 UTCJun 22, 02:14 UTC1h 10m
2026-06-19 N2108J - Jun 19, 18:49 UTCJun 19, 20:44 UTC1h 55m
2026-06-19 N2108J - Jun 19, 16:09 UTCJun 19, 16:25 UTC15m
2026-06-18 N - Jun 18, 13:20 UTCJun 18, 13:35 UTC15m
2026-06-17 N - Jun 17, 23:45 UTCJun 18, 00:05 UTC20m
2026-06-17 N - Jun 17, 22:10 UTCJun 17, 22:45 UTC35m
2026-06-17 N HIO → BLI Jun 17, 15:55 UTCJun 17, 17:45 UTC1h 50m
2026-06-16 N - Jun 16, 23:35 UTCJun 16, 23:50 UTC15m
2026-06-16 N - Jun 16, 19:25 UTCJun 16, 20:00 UTC36m
2026-06-16 N - Jun 16, 17:19 UTCJun 16, 17:55 UTC35m
2026-06-16 N - Jun 16, 16:25 UTCJun 16, 16:39 UTC15m
2026-06-16 N - Jun 16, 00:24 UTCJun 16, 00:45 UTC20m
2026-06-15 N - Jun 15, 22:15 UTCJun 15, 23:30 UTC1h 15m
2026-06-15 N - Jun 15, 19:45 UTCJun 15, 21:30 UTC1h 45m
2026-06-15 N - Jun 15, 17:45 UTCJun 15, 17:54 UTC10m
2026-06-15 N - Jun 15, 16:24 UTCJun 15, 17:04 UTC40m
2026-06-12 N - Jun 12, 18:35 UTCJun 12, 20:35 UTC2h 0m
2026-06-12 N - Jun 12, 15:45 UTCJun 12, 18:01 UTC2h 15m
2026-06-11 N2108J - Jun 11, 18:20 UTCJun 11, 18:40 UTC20m
2026-06-11 N2108J - Jun 11, 16:20 UTCJun 11, 16:40 UTC20m
2026-06-10 N2108J - Jun 10, 23:20 UTCJun 11, 00:05 UTC45m
2026-06-10 N2108J - Jun 10, 23:00 UTCJun 10, 23:15 UTC15m
2026-06-10 N2108J - Jun 10, 20:10 UTCJun 10, 21:45 UTC1h 35m
2026-06-10 N2108J - Jun 10, 16:15 UTCJun 10, 17:40 UTC1h 25m
2026-06-09 N2108J - Jun 9, 18:00 UTCJun 9, 18:35 UTC35m
2026-06-09 N2108J - Jun 9, 17:05 UTCJun 9, 17:25 UTC20m
2026-06-08 N2108J - Jun 8, 22:45 UTCJun 9, 00:05 UTC1h 20m
2026-06-08 N2108J - Jun 8, 20:50 UTCJun 8, 21:00 UTC10m
2026-06-08 N2108J - Jun 8, 19:50 UTCJun 8, 20:15 UTC25m
2026-06-08 N2108J - Jun 8, 17:05 UTCJun 8, 18:30 UTC1h 25m
2026-06-05 N2108J - Jun 5, 21:50 UTCJun 5, 23:50 UTC2h 0m
2026-06-05 N2108J - Jun 5, 19:30 UTCJun 5, 19:45 UTC15m
2026-06-05 N2108J - Jun 5, 02:40 UTCJun 5, 03:10 UTC30m
2026-06-04 N2108J - Jun 4, 13:40 UTCJun 4, 15:35 UTC1h 55m
2026-06-04 N2108J - Jun 4, 00:10 UTCJun 4, 00:25 UTC15m
2026-06-03 N2108J - Jun 3, 22:35 UTCJun 3, 22:50 UTC15m
2026-06-03 N2108J - Jun 3, 19:25 UTCJun 3, 21:15 UTC1h 50m
2026-06-03 N2108J - Jun 3, 17:40 UTCJun 3, 18:35 UTC55m
2026-06-03 N2108J BLI → CLM Jun 3, 16:40 UTCJun 3, 17:35 UTC55m
2026-06-03 N2108J - Jun 3, 13:50 UTCJun 3, 15:45 UTC1h 55m
2026-06-03 N2108J - Jun 3, 00:10 UTCJun 3, 00:30 UTC20m
2026-06-02 N2108J - Jun 2, 19:20 UTCJun 2, 21:30 UTC2h 10m
2026-06-01 N2108J - Jun 1, 13:25 UTCJun 1, 14:10 UTC45m
2026-05-30 N2108J - May 30, 19:30 UTCMay 30, 19:55 UTC25m
2026-05-30 N2108J - May 30, 19:00 UTCMay 30, 19:25 UTC25m
2026-05-29 N2108J - May 29, 22:40 UTCMay 30, 01:10 UTC2h 30m
2026-05-29 N2108J - May 29, 21:00 UTCMay 29, 21:10 UTC10m

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 N2108J page for operator, model, and routing details .

Mode-S A1BCFB frequently asked

What is Mode-S code A1BCFB?
A1BCFB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2108J.
Where is Mode-S A1BCFB registered?
Mode-S code A1BCFB 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 A1BCFB broadcasting right now?
No active broadcast right now. Last signal was 24d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1BCFB, octal 50336373, decimal 10,599,675.
What flights does A1BCFB operate?
Mode-S A1BCFB has broadcast 2 distinct callsigns, including N2108J, N.