Apparatus

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sensors Mode-S transponder

A1CF48

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2156J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A1CF48
Octal
50347510
Decimal
10,604,360
Country
US
Tail
N2156J
Type
A21N
Transponder active on ground
Flights observed
10
Distinct callsigns
4
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A1CF48.

Country allocation

The ICAO 24-bit address A1CF48 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 4 distinct

Callsign Airline Flights Last seen
JBU133 - 5 2026-04-13
JBU178 - 2 2026-04-13
JBU1734 JetBlue Airways 2 2026-04-13
JBU111 JetBlue Airways 1 2026-04-12

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-13 JBU1734 SFO → BOS Apr 13, 19:50 UTCApr 13, 23:45 UTC3h 55m
2026-04-13 JBU1734 SFO → BOS Apr 13, 19:25 UTCApr 13, 19:55 UTC30m
2026-04-13 JBU133 - Apr 13, 16:15 UTCApr 13, 18:00 UTC1h 45m
2026-04-13 JBU133 - Apr 13, 15:50 UTCApr 13, 18:00 UTC2h 10m
2026-04-13 JBU133 - Apr 13, 12:20 UTCApr 13, 16:15 UTC3h 55m
2026-04-13 JBU133 - Apr 13, 11:55 UTCApr 13, 15:50 UTC3h 55m
2026-04-13 JBU133 - Apr 13, 11:25 UTCApr 13, 12:15 UTC50m
2026-04-13 JBU178 - Apr 13, 00:20 UTCApr 13, 02:35 UTC2h 15m
2026-04-12 JBU178 - Apr 12, 23:55 UTCApr 13, 02:35 UTC2h 40m
2026-04-12 JBU111 JFK → LAS Apr 12, 17:15 UTCApr 12, 20:15 UTC3h 0m

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 N2156J page for operator, model, and routing details .

Mode-S A1CF48 frequently asked

What is Mode-S code A1CF48?
A1CF48 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2156J.
Where is Mode-S A1CF48 registered?
Mode-S code A1CF48 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 A1CF48 broadcasting right now?
Mode-S A1CF48 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1CF48, octal 50347510, decimal 10,604,360.
What flights does A1CF48 operate?
Mode-S A1CF48 has broadcast 4 distinct callsigns, including JBU133, JBU178, JBU1734, JBU111.