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
No current signal · last broadcast 3h ago
Flights observed
255
Distinct callsigns
20
Country
US
Last broadcast
3h 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 20 distinct

Callsign Airline Flights Last seen
JBU842 - 16 2026-07-11
JBU133 JetBlue Airways 16 2026-04-16
JBU353 - 15 2026-07-08
JBU1080 - 12 2026-07-13
JBU1079 - 12 2026-06-24
JBU1734 JetBlue Airways 11 2026-04-16
JBU354 - 10 2026-07-04
JBU841 - 9 2026-07-09
JBU123 JetBlue Airways 9 2026-05-20
JBU224 JetBlue Airways 8 2026-05-17
JBU73 - 7 2026-07-13
JBU72 - 7 2026-06-24
JBU1926 - 6 2026-06-23
JBU724 JetBlue Airways 5 2026-05-10
JBU411 - 5 2026-07-10
JBU323 - 5 2026-06-12
JBU223 JetBlue Airways 5 2026-06-13
JBU2124 JetBlue Airways 5 2026-05-19
JBU1190 JetBlue Airways 5 2026-05-13
JBU834 JetBlue Airways 4 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JBU31 BOS → AMS Jul 14, 00:31 UTCJul 14, 01:50 UTC1h 20m
2026-07-13 JBU1080 - Jul 13, 10:45 UTCJul 13, 11:50 UTC1h 5m
2026-07-13 JBU1080 EDI → BOS Jul 13, 10:41 UTCJul 14, 01:50 UTC15h 10m
2026-07-13 JBU73 JFK → EDI Jul 13, 01:30 UTCJul 13, 07:55 UTC6h 25m
2026-07-11 JBU842 DUB → JFK Jul 11, 11:05 UTCJul 11, 18:10 UTC7h 5m
2026-07-10 JBU1548 LAS → JFK Jul 10, 18:59 UTCJul 11, 18:00 UTC23h 2m
2026-07-10 JBU1548 LAS → JFK Jul 10, 19:00 UTCJul 10, 23:20 UTC4h 21m
2026-07-10 JBU411 JFK → LAS Jul 10, 12:35 UTCJul 10, 17:15 UTC4h 40m
2026-07-09 JBU842 DUB → JFK Jul 9, 12:13 UTCJul 9, 19:05 UTC6h 52m
2026-07-09 JBU841 JFK → DUB Jul 9, 01:35 UTCJul 9, 19:05 UTC17h 30m
2026-07-09 JBU841 - Jul 9, 01:35 UTCJul 9, 03:10 UTC1h 35m
2026-07-08 JBU842 DUB → JFK Jul 8, 11:00 UTCJul 8, 17:50 UTC6h 50m
2026-07-08 JBU353 - Jul 8, 01:25 UTCJul 8, 07:20 UTC5h 55m
2026-07-07 JBU73 JFK → EDI Jul 7, 01:57 UTCJul 7, 18:00 UTC16h 4m
2026-07-06 JBU842 DUB → JFK Jul 6, 11:45 UTCJul 7, 08:15 UTC20h 31m
2026-07-06 JBU353 BOS → DUB Jul 6, 04:15 UTCJul 7, 03:40 UTC23h 25m
2026-07-05 JBU1034 SFO → BOS Jul 5, 04:09 UTCJul 6, 04:00 UTC23h 52m
2026-07-04 JBU833 - Jul 4, 20:00 UTCJul 5, 01:45 UTC5h 45m
2026-07-04 JBU833 BOS → SFO Jul 4, 19:56 UTCJul 5, 18:00 UTC22h 5m
2026-07-04 JBU833 BOS → BOS Jul 4, 19:25 UTCJul 4, 19:35 UTC10m
2026-07-04 JBU354 DUB → BOS Jul 4, 10:00 UTCJul 4, 16:35 UTC6h 35m
2026-07-03 JBU1177 BOS → LAS Jul 3, 12:40 UTCJul 3, 17:45 UTC5h 5m
2026-07-03 JBU1177 BOS → LAS Jul 3, 12:40 UTCJul 4, 10:50 UTC22h 10m
2026-07-03 JBU488 - Jul 3, 06:10 UTCJul 3, 11:10 UTC5h 0m
2026-07-02 JBU1387 - Jul 2, 22:45 UTCJul 3, 04:20 UTC5h 35m
2026-07-02 JBU354 DUB → BOS Jul 2, 09:55 UTCJul 2, 16:40 UTC6h 45m
2026-07-02 JBU353 BOS → DUB Jul 2, 01:15 UTCJul 2, 06:45 UTC5h 30m
2026-07-01 JBU2120 - Jul 1, 04:15 UTCJul 1, 09:05 UTC4h 50m
2026-06-30 JBU354 DUB → BOS Jun 30, 10:00 UTCJun 30, 16:25 UTC6h 25m
2026-06-30 JBU354 DUB → BOS Jun 30, 09:58 UTCJul 1, 08:00 UTC22h 3m
2026-06-30 JBU353 BOS → DUB Jun 30, 01:19 UTCJun 30, 06:45 UTC5h 26m
2026-06-29 JBU620 - Jun 29, 17:40 UTCJun 29, 22:35 UTC4h 55m
2026-06-29 JBU619 - Jun 29, 10:24 UTCJun 29, 16:10 UTC5h 45m
2026-06-28 JBU219 - Jun 28, 13:00 UTCJun 28, 18:40 UTC5h 40m
2026-06-28 JBU219 BOS → SAN Jun 28, 12:57 UTCJun 29, 12:00 UTC23h 3m
2026-06-27 JBU833 BOS → SFO Jun 27, 19:15 UTCJun 28, 18:00 UTC22h 45m
2026-06-27 JBU354 - Jun 27, 09:55 UTCJun 27, 10:45 UTC50m
2026-06-27 JBU354 DUB → BOS Jun 27, 09:53 UTCJun 28, 08:00 UTC22h 7m
2026-06-27 JBU353 BOS → DUB Jun 27, 01:35 UTCJun 27, 06:59 UTC5h 25m
2026-06-26 123456 BOS → BOS Jun 26, 21:35 UTCJun 26, 21:39 UTC5m
2026-06-26 JBU354 DUB → BOS Jun 26, 09:59 UTCJun 26, 16:39 UTC6h 40m
2026-06-26 JBU353 - Jun 26, 01:15 UTCJun 26, 06:29 UTC5h 15m
2026-06-26 JBU353 BOS → BOS Jun 26, 01:05 UTCJun 26, 01:10 UTC5m
2026-06-25 JBU488 - Jun 25, 05:35 UTCJun 25, 10:30 UTC4h 55m
2026-06-24 JBU72 EDI → JFK Jun 24, 11:11 UTCJun 25, 09:59 UTC22h 49m
2026-06-24 JBU72 - Jun 24, 11:14 UTCJun 24, 12:04 UTC50m
2026-06-24 JBU1079 BOS → EDI Jun 24, 02:49 UTCJun 24, 08:35 UTC5h 45m
2026-06-23 JBU1926 LGW → BOS Jun 23, 11:59 UTCJun 24, 09:59 UTC22h 1m
2026-06-23 JBU1926 LGW → BOS Jun 23, 11:59 UTCJun 24, 09:59 UTC22h 1m
2026-06-23 JBU2104 BOS → LGW Jun 23, 02:07 UTCJun 24, 01:55 UTC23h 48m

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?
No active broadcast right now. Last signal was 3h ago.
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 20 distinct callsigns, including JBU842, JBU133, JBU353, JBU1080, JBU1079.