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
Broadcasting now · callsign JBU353 · 3,125 ft
Flights observed
285
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:15 UTC

Current position

A1CF48 is currently broadcasting. Map zoomed to live position.

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
JBU353 JetBlue Airways 17 2026-07-21
JBU842 - 16 2026-07-11
JBU133 JetBlue Airways 16 2026-04-16
JBU1079 - 14 2026-07-19
JBU354 - 13 2026-07-21
JBU1080 JetBlue Airways 13 2026-07-26
JBU1734 JetBlue Airways 11 2026-04-16
JBU841 - 9 2026-07-09
JBU123 JetBlue Airways 9 2026-05-20
JBU73 JetBlue Airways 8 2026-07-26
JBU224 JetBlue Airways 8 2026-05-17
JBU72 - 7 2026-06-24
JBU620 JetBlue Airways 6 2026-07-23
JBU619 - 6 2026-07-23
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JBU1080 EDI → BOS Jul 26, 11:00 UTCJul 26, 18:10 UTC7h 10m
2026-07-26 JBU73 JFK → BNA Jul 26, 02:45 UTCJul 26, 08:55 UTC6h 11m
2026-07-25 JBU1024 FLL → JFK Jul 25, 05:45 UTCJul 25, 10:40 UTC4h 55m
2026-07-25 JBU1024 FLL → JFK Jul 25, 05:40 UTCJul 26, 04:00 UTC22h 20m
2026-07-24 JBU1387 BOS → LAX Jul 24, 22:10 UTCJul 25, 03:40 UTC5h 30m
2026-07-24 JBU2104 BOS → LGW Jul 24, 02:07 UTCJul 25, 02:00 UTC23h 53m
2026-07-23 JBU620 SAN → BOS Jul 23, 17:30 UTCJul 23, 18:00 UTC30m
2026-07-23 JBU619 - Jul 23, 12:00 UTCJul 23, 15:55 UTC3h 55m
2026-07-23 JBU619 BOS → SAN Jul 23, 10:18 UTCJul 24, 08:20 UTC22h 2m
2026-07-23 JBU619 - Jul 23, 10:20 UTCJul 23, 11:55 UTC1h 35m
2026-07-23 JB2156MX BOS → BOS Jul 23, 05:45 UTCJul 23, 05:50 UTC5m
2026-07-22 JBU620 SAN → BOS Jul 22, 21:50 UTCJul 23, 03:00 UTC5h 10m
2026-07-22 JBU219 JFK → DTW Jul 22, 13:05 UTCJul 22, 18:40 UTC5h 35m
2026-07-21 JBU354 DUB → BOS Jul 21, 10:05 UTCJul 22, 05:25 UTC19h 20m
2026-07-21 JBU354 DUB → BOS Jul 21, 10:10 UTCJul 21, 16:35 UTC6h 25m
2026-07-21 JBU353 JFK → BUR Jul 21, 02:30 UTCJul 21, 08:00 UTC5h 30m
2026-07-20 JBU620 - Jul 20, 22:10 UTCJul 20, 23:50 UTC1h 40m
2026-07-20 JBU620 - Jul 20, 18:35 UTCJul 20, 22:05 UTC3h 30m
2026-07-19 JBU319 JFK → ATL Jul 19, 22:12 UTCJul 20, 22:00 UTC23h 49m
2026-07-19 JBU319 JFK → ATL Jul 19, 22:15 UTCJul 20, 03:40 UTC5h 25m
2026-07-19 JBU1079 BOS → EDI Jul 19, 02:44 UTCJul 20, 02:00 UTC23h 17m
2026-07-19 JBU1079 BOS → EDI Jul 19, 02:45 UTCJul 19, 08:40 UTC5h 55m
2026-07-17 JBU354 DUB → BOS Jul 17, 10:00 UTCJul 17, 16:19 UTC6h 20m
2026-07-17 JBU353 BOS → DUB Jul 17, 01:24 UTCJul 17, 02:45 UTC1h 21m
2026-07-16 JBU620 SAN → BOS Jul 16, 17:34 UTCJul 17, 16:00 UTC22h 26m
2026-07-16 JBU619 BOS → SAN Jul 16, 10:09 UTCJul 17, 10:00 UTC23h 51m
2026-07-16 JBU619 BOS → SAN Jul 16, 10:10 UTCJul 16, 15:25 UTC5h 15m
2026-07-15 JBU2260 - Jul 15, 12:25 UTCJul 15, 19:45 UTC7h 20m
2026-07-15 JBU2261 - Jul 15, 02:40 UTCJul 15, 09:25 UTC6h 45m
2026-07-15 JBU2261 BOS → BOS Jul 15, 02:10 UTCJul 15, 02:15 UTC5m
2026-07-14 JBU31 BOS → AMS Jul 14, 00:31 UTCJul 14, 17:30 UTC17h 0m
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, 09:55 UTC23h 15m
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

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?
Yes. Mode-S A1CF48 is currently airborne.
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 JBU353, JBU842, JBU133, JBU1079, JBU354.