Apparatus

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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 Jul 26, 19:05 UTC
Flights observed
235
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:05 UTC

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 - 21 2026-07-22
JBU1107 - 18 2026-07-21
JBU34 JetBlue Airways 17 2026-07-23
JBU2261 JetBlue Airways 17 2026-07-24
JBU7 - 15 2026-07-14
JBU1407 JetBlue Airways 15 2026-07-23
JBU33 JetBlue Airways 14 2026-07-20
JBU20 - 13 2026-07-14
JBU1620 JetBlue Airways 13 2026-07-24
JBU1408 - 12 2026-07-20
JBU32 - 11 2026-07-12
JBU1621 JetBlue Airways 11 2026-07-25
JBU2260 - 9 2026-07-05
JBU346 JetBlue Airways 8 2026-07-26
JBU345 JetBlue Airways 6 2026-07-26
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
2026-07-26 JBU346 SRQ → JFK Jul 26, 11:30 UTCJul 26, 19:00 UTC7h 30m
2026-07-26 JBU345 JFK → SRQ Jul 26, 01:45 UTCJul 26, 08:40 UTC6h 56m
2026-07-25 JBU1621 LHR → BOS Jul 25, 08:30 UTCJul 25, 15:20 UTC6h 50m
2026-07-24 JBU1620 BOS → LHR Jul 24, 23:00 UTCJul 25, 05:20 UTC6h 20m
2026-07-24 JBU2261 LGA → PBI Jul 24, 02:40 UTCJul 24, 09:15 UTC6h 35m
2026-07-24 JBU2261 LGA → PBI Jul 24, 02:36 UTCJul 25, 00:25 UTC21h 49m
2026-07-23 JBU34 SFO → BOS Jul 23, 09:35 UTCJul 23, 16:35 UTC7h 0m
2026-07-23 JBU1407 JFK → CDG Jul 23, 00:25 UTCJul 23, 07:25 UTC7h 0m
2026-07-22 JBU2220 - Jul 22, 12:40 UTCJul 22, 14:50 UTC2h 10m
2026-07-22 JBU2220 LHR → JFK Jul 22, 07:33 UTCJul 23, 02:00 UTC18h 27m
2026-07-21 JBU1107 JFK → LHR Jul 21, 13:10 UTCJul 21, 19:50 UTC6h 40m
2026-07-20 JBU1408 - Jul 20, 11:30 UTCJul 20, 19:00 UTC7h 30m
2026-07-20 JBU33 BOS → SFO Jul 20, 02:12 UTCJul 20, 08:45 UTC6h 34m
2026-07-20 JBU33 BOS → SFO Jul 20, 02:15 UTCJul 20, 08:45 UTC6h 30m
2026-07-19 JBU1621 LHR → BOS Jul 19, 08:42 UTCJul 20, 07:30 UTC22h 49m
2026-07-18 JBU1620 BOS → LHR Jul 18, 23:14 UTCJul 19, 15:45 UTC16h 32m
2026-07-18 JBU1620 BOS → LHR Jul 18, 23:15 UTCJul 19, 05:45 UTC6h 30m
2026-07-18 JBU2261 BOS → MAD Jul 18, 04:00 UTCJul 18, 10:20 UTC6h 20m
2026-07-18 JBU2261 BOS → MAD Jul 18, 03:56 UTCJul 19, 00:35 UTC20h 40m
2026-07-17 JBU34 - Jul 17, 09:30 UTCJul 17, 11:04 UTC1h 35m
2026-07-17 JBU34 CDG → BOS Jul 17, 09:29 UTCJul 18, 05:00 UTC19h 32m
2026-07-17 JBU1407 JFK → CDG Jul 17, 00:10 UTCJul 17, 07:14 UTC7h 5m
2026-07-16 JBU2220 - Jul 16, 07:50 UTCJul 16, 13:30 UTC5h 40m
2026-07-16 JBU2220 LHR → JFK Jul 16, 07:46 UTCJul 17, 05:30 UTC21h 44m
2026-07-15 JBU1107 JFK → LHR Jul 15, 13:10 UTCJul 15, 19:55 UTC6h 45m
2026-07-14 JBU20 - Jul 14, 11:30 UTCJul 14, 12:45 UTC1h 15m
2026-07-14 JBU20 LHR → JFK Jul 14, 11:29 UTCJul 14, 18:55 UTC7h 27m
2026-07-14 JBU7 JFK → LHR Jul 14, 01:49 UTCJul 14, 08:40 UTC6h 52m
2026-07-14 JBU7 - Jul 14, 01:50 UTCJul 14, 08:40 UTC6h 50m
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

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 Jul 26, 19:05 UTC.
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, JBU34, JBU2261, JBU7.