Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4BEF6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4048J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A4BEF6
Octal
51137366
Decimal
10,796,790
Country
US
Tail
N4048J
Type
A21N
No current signal · last broadcast 54m ago
Flights observed
207
Distinct callsigns
20
Country
US
Last broadcast
54m ago

Last known position

Most recent position reported by Mode-S A4BEF6.

Country allocation

The ICAO 24-bit address A4BEF6 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
JBU2220 - 17 2026-07-10
JBU1107 - 16 2026-07-09
JBU7 - 14 2026-07-14
JBU34 - 14 2026-07-11
JBU2261 - 13 2026-07-05
JBU1407 - 13 2026-07-10
JBU33 - 12 2026-07-07
JBU32 - 11 2026-07-12
JBU20 JetBlue Airways 11 2026-07-08
JBU1408 JetBlue Airways 11 2026-06-23
JBU1620 - 10 2026-07-12
JBU2260 - 9 2026-07-05
JBU1621 - 9 2026-07-13
JBU346 - 7 2026-07-02
JBU345 - 5 2026-07-02
JBU331 JetBlue Airways 5 2026-07-03
JBU31 - 4 2026-07-12
JBU2009 - 3 2026-04-13
JBU1191 - 3 2026-04-16
JBU8517 JetBlue Airways 2 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JBU7 JFK → LHR Jul 14, 01:49 UTCJul 14, 08:40 UTC6h 52m
2026-07-13 JBU1621 LHR → BOS Jul 13, 08:04 UTCJul 14, 07:30 UTC23h 27m
2026-07-12 JBU1620 BOS → LHR Jul 12, 22:55 UTCJul 13, 18:40 UTC19h 46m
2026-07-12 JBU32 AMS → BOS Jul 12, 09:42 UTCJul 13, 09:20 UTC23h 39m
2026-07-12 JBU32 - Jul 12, 09:45 UTCJul 12, 16:55 UTC7h 10m
2026-07-12 JBU31 BOS → AMS Jul 12, 01:15 UTCJul 12, 07:40 UTC6h 25m
2026-07-11 JBU34 CDG → BOS Jul 11, 09:32 UTCJul 12, 07:31 UTC21h 59m
2026-07-10 JBU1407 - Jul 10, 23:55 UTCJul 11, 01:20 UTC1h 25m
2026-07-10 JBU1407 JFK → CDG Jul 10, 23:51 UTCJul 11, 17:05 UTC17h 15m
2026-07-10 JBU2220 LHR → JFK Jul 10, 07:55 UTCJul 10, 15:25 UTC7h 30m
2026-07-09 JBU1107 JFK → LHR Jul 9, 13:06 UTCJul 10, 09:15 UTC20h 9m
2026-07-09 JBU1107 - Jul 9, 13:10 UTCJul 9, 19:30 UTC6h 20m
2026-07-08 JBU20 LHR → JFK Jul 8, 11:50 UTCJul 8, 19:05 UTC7h 16m
2026-07-08 JBU7 JFK → LHR Jul 8, 02:29 UTCJul 8, 19:05 UTC16h 37m
2026-07-08 JBU7 - Jul 8, 02:30 UTCJul 8, 04:15 UTC1h 45m
2026-07-07 JBU33 BOS → CDG Jul 7, 02:02 UTCJul 7, 18:20 UTC16h 18m
2026-07-06 JBU1621 LHR → BOS Jul 6, 07:56 UTCJul 7, 07:30 UTC23h 35m
2026-07-05 JBU1620 BOS → LHR Jul 5, 23:18 UTCJul 6, 17:15 UTC17h 58m
2026-07-05 JBU1620 - Jul 5, 23:20 UTCJul 6, 00:35 UTC1h 15m
2026-07-05 JBU2260 - Jul 5, 12:30 UTCJul 5, 19:50 UTC7h 20m
2026-07-05 JBU2261 - Jul 5, 02:55 UTCJul 5, 09:10 UTC6h 15m
2026-07-03 JBU1620 BOS → LHR Jul 3, 23:19 UTCJul 4, 15:25 UTC16h 6m
2026-07-03 JBU1620 - Jul 3, 23:20 UTCJul 4, 00:45 UTC1h 25m
2026-07-03 JBU331 BDL → MCO Jul 3, 00:35 UTCJul 3, 23:30 UTC22h 55m
2026-07-03 JBU331 BDL → MCO Jul 3, 00:40 UTCJul 3, 01:30 UTC50m
2026-07-02 JBU346 BCN → BOS Jul 2, 11:30 UTCJul 2, 19:15 UTC7h 45m
2026-07-02 JBU345 BOS → BCN Jul 2, 00:45 UTCJul 2, 07:35 UTC6h 50m
2026-07-01 JBU34 - Jul 1, 09:40 UTCJul 1, 10:45 UTC1h 5m
2026-07-01 JBU34 CDG → BOS Jul 1, 09:39 UTCJul 2, 07:50 UTC22h 11m
2026-07-01 JBU1407 JFK → CDG Jul 1, 00:20 UTCJul 1, 07:00 UTC6h 40m
2026-06-30 JBU2220 LHR → JFK Jun 30, 07:35 UTCJun 30, 14:50 UTC7h 15m
2026-06-30 JBU2220 LHR → JFK Jun 30, 07:32 UTCJul 1, 05:30 UTC21h 59m
2026-06-29 JBU1107 JFK → LHR Jun 29, 13:20 UTCJun 30, 08:40 UTC19h 21m
2026-06-29 JBU1107 JFK → LHR Jun 29, 13:24 UTCJun 29, 15:04 UTC1h 40m
2026-06-28 JBU2220 LHR → JFK Jun 28, 07:29 UTCJun 28, 14:54 UTC7h 25m
2026-06-28 JBU2220 LHR → JFK Jun 28, 07:24 UTCJun 28, 14:59 UTC7h 36m
2026-06-27 JBU1107 JFK → LHR Jun 27, 13:00 UTCJun 27, 14:35 UTC1h 35m
2026-06-27 JBU1107 JFK → LHR Jun 27, 12:55 UTCJun 28, 08:44 UTC19h 50m
2026-06-27 JBU1190 SAN → JFK Jun 27, 04:05 UTCJun 27, 08:39 UTC4h 35m
2026-06-26 JBU2220 LHR → JFK Jun 26, 07:55 UTCJun 26, 08:54 UTC1h 0m
2026-06-26 JBU2220 LHR → JFK Jun 26, 07:35 UTCJun 26, 07:50 UTC15m
2026-06-26 JBU2220 LHR → JFK Jun 26, 07:33 UTCJun 27, 05:29 UTC21h 57m
2026-06-26 JBU2220 LHR → JFK Jun 26, 07:33 UTCJun 27, 05:29 UTC21h 57m
2026-06-25 JBU1107 JFK → LHR Jun 25, 13:00 UTCJun 25, 19:29 UTC6h 30m
2026-06-24 JBU20 LHR → JFK Jun 24, 11:24 UTCJun 24, 19:04 UTC7h 40m
2026-06-24 JBU20 LHR → JFK Jun 24, 11:22 UTCJun 24, 19:10 UTC7h 48m
2026-06-24 JBU7 JFK → LHR Jun 24, 01:39 UTCJun 24, 08:04 UTC6h 25m
2026-06-23 JBU1408 MIA → EWR Jun 23, 10:44 UTCJun 23, 18:39 UTC7h 55m
2026-06-23 JBU1408 MIA → EWR Jun 23, 10:43 UTCJun 24, 08:04 UTC21h 22m
2026-06-23 JBU33 BOS → CDG Jun 23, 01:45 UTCJun 23, 08:04 UTC6h 20m

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 N4048J page for operator, model, and routing details .

Mode-S A4BEF6 frequently asked

What is Mode-S code A4BEF6?
A4BEF6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4048J.
Where is Mode-S A4BEF6 registered?
Mode-S code A4BEF6 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 A4BEF6 broadcasting right now?
No active broadcast right now. Last signal was 54m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BEF6, octal 51137366, decimal 10,796,790.
What flights does A4BEF6 operate?
Mode-S A4BEF6 has broadcast 20 distinct callsigns, including JBU2220, JBU1107, JBU7, JBU34, JBU2261.