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
Broadcasting now · callsign JBU1407 · 35,000 ft
Flights observed
105
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Current position

A4BEF6 is currently broadcasting. Map zoomed to live position.

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
JBU2261 JetBlue Airways 10 2026-05-20
JBU34 JetBlue Airways 7 2026-05-26
JBU2260 JetBlue Airways 7 2026-05-20
JBU2220 JetBlue Airways 7 2026-05-25
JBU1408 JetBlue Airways 7 2026-05-27
JBU1407 JetBlue Airways 7 2026-05-29
JBU1107 JetBlue Airways 7 2026-05-24
JBU7 JetBlue Airways 6 2026-05-29
JBU33 JetBlue Airways 6 2026-05-27
JBU346 JetBlue Airways 4 2026-05-18
JBU32 JetBlue Airways 4 2026-05-09
JBU1621 JetBlue Airways 4 2026-05-21
JBU2009 - 3 2026-04-13
JBU20 JetBlue Airways 3 2026-05-29
JBU1620 JetBlue Airways 3 2026-05-20
JBU1191 - 3 2026-04-16
JBU8517 JetBlue Airways 2 2026-05-10
JBU692 JetBlue Airways 2 2026-04-16
JBU466 - 2 2026-04-17
JBU345 JetBlue Airways 2 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JBU1407 JFK → CDG May 29, 23:45 UTCMay 30, 01:35 UTC1h 50m
2026-05-29 JBU20 LHR → JFK May 29, 11:30 UTCMay 29, 18:35 UTC7h 5m
2026-05-29 JBU7 JFK → LHR May 29, 01:50 UTCMay 29, 08:45 UTC6h 55m
2026-05-28 JBU20 LHR → JFK May 28, 11:28 UTCMay 29, 08:45 UTC21h 17m
2026-05-28 JBU7 JFK → LHR May 28, 01:16 UTCMay 28, 18:40 UTC17h 24m
2026-05-27 JBU1408 MIA → EWR May 27, 11:05 UTCMay 27, 12:40 UTC1h 35m
2026-05-27 JBU1408 MIA → EWR May 27, 11:00 UTCMay 28, 08:00 UTC21h 0m
2026-05-27 JBU33 BOS → SFO May 27, 01:59 UTCMay 27, 08:55 UTC6h 56m
2026-05-26 JBU34 SFO → BOS May 26, 09:37 UTCMay 27, 08:55 UTC23h 19m
2026-05-26 JBU34 SFO → BOS May 26, 09:37 UTCMay 27, 08:55 UTC23h 19m
2026-05-25 JBU1407 JFK → CDG May 25, 23:42 UTCMay 26, 16:55 UTC17h 13m
2026-05-25 JBU1407 JFK → CDG May 25, 23:45 UTCMay 26, 01:20 UTC1h 35m
2026-05-25 JBU2220 LHR → JFK May 25, 07:25 UTCMay 25, 14:45 UTC7h 20m
2026-05-24 JBU1107 JFK → LHR May 24, 13:00 UTCMay 24, 19:45 UTC6h 45m
2026-05-23 JBU20 LHR → JFK May 23, 11:15 UTCMay 23, 19:10 UTC7h 56m
2026-05-23 JBU7 JFK → LHR May 23, 01:50 UTCMay 23, 08:10 UTC6h 20m
2026-05-22 JBU1408 MIA → EWR May 22, 10:45 UTCMay 22, 18:25 UTC7h 40m
2026-05-22 JBU33 BOS → SFO May 22, 01:55 UTCMay 22, 07:55 UTC6h 0m
2026-05-21 JBU1621 LHR → BOS May 21, 07:45 UTCMay 21, 09:05 UTC1h 20m
2026-05-21 JBU1621 LHR → BOS May 21, 07:44 UTCMay 22, 07:30 UTC23h 47m
2026-05-20 JBU1620 BOS → LHR May 20, 23:05 UTCMay 21, 05:20 UTC6h 15m
2026-05-20 JBU2260 MAD → BOS May 20, 11:55 UTCMay 20, 19:20 UTC7h 25m
2026-05-20 JBU2261 LGA → PBI May 20, 03:09 UTCMay 20, 04:35 UTC1h 26m
2026-05-20 JBU2261 LGA → PBI May 20, 03:10 UTCMay 20, 09:35 UTC6h 26m
2026-05-18 JBU346 SRQ → JFK May 18, 11:25 UTCMay 18, 13:10 UTC1h 46m
2026-05-18 JBU346 SRQ → JFK May 18, 11:30 UTCMay 18, 19:20 UTC7h 49m
2026-05-18 JBU345 JFK → SRQ May 18, 00:45 UTCMay 18, 07:30 UTC6h 45m
2026-05-16 JBU2261 LGA → PBI May 16, 03:10 UTCMay 16, 09:31 UTC6h 21m
2026-05-16 JBU2261 LGA → PBI May 16, 03:05 UTCMay 16, 19:50 UTC16h 46m
2026-05-15 JBU1621 LHR → BOS May 15, 07:50 UTCMay 15, 15:10 UTC7h 19m
2026-05-14 JBU1620 BOS → LHR May 14, 23:00 UTCMay 15, 05:10 UTC6h 10m
2026-05-14 JBU2260 MAD → BOS May 14, 19:25 UTCMay 14, 19:30 UTC5m
2026-05-14 JBU2260 MAD → BOS May 14, 11:50 UTCMay 14, 19:20 UTC7h 30m
2026-05-14 JBU2261 LGA → PBI May 14, 02:40 UTCMay 14, 09:10 UTC6h 30m
2026-05-13 JBU34 SFO → BOS May 13, 09:30 UTCMay 13, 16:55 UTC7h 25m
2026-05-13 JBU34 SFO → BOS May 13, 09:26 UTCMay 14, 04:00 UTC18h 35m
2026-05-12 JBU1407 JFK → CDG May 12, 23:50 UTCMay 13, 07:05 UTC7h 15m
2026-05-12 JBU1408 MIA → EWR May 12, 10:37 UTCMay 13, 09:30 UTC22h 54m
2026-05-12 JBU33 BOS → SFO May 12, 06:15 UTCMay 12, 07:55 UTC1h 40m
2026-05-12 JBU33 BOS → SFO May 12, 01:34 UTCMay 13, 01:25 UTC23h 52m
2026-05-11 JBU8518 BOS → JFK May 11, 20:55 UTCMay 11, 21:30 UTC35m
2026-05-11 JBU842 DUB → JFK May 11, 10:45 UTCMay 11, 18:00 UTC7h 16m
2026-05-10 JBU8517 BOS → JFK May 10, 16:04 UTCMay 10, 16:44 UTC40m
2026-05-10 JBU8517 BOS → JFK May 10, 16:01 UTCMay 11, 11:30 UTC19h 29m
2026-05-09 JBU32 AMS → BOS May 9, 10:10 UTCMay 9, 17:25 UTC7h 15m
2026-05-09 JBU32 AMS → BOS May 9, 10:07 UTCMay 10, 06:25 UTC20h 18m
2026-05-09 JBU31 BOS → AMS May 9, 00:15 UTCMay 9, 07:00 UTC6h 45m
2026-05-08 JBU32 AMS → BOS May 8, 09:29 UTCMay 9, 07:10 UTC21h 41m
2026-05-08 JBU32 AMS → BOS May 8, 09:34 UTCMay 8, 17:05 UTC7h 30m
2026-05-07 JBU2260 MAD → BOS May 7, 11:57 UTCMay 8, 11:14 UTC23h 18m

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?
Yes. Mode-S A4BEF6 is currently airborne.
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 JBU2261, JBU34, JBU2260, JBU2220, JBU1408.