Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4CD23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4083J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A4CD23
Octal
51146443
Decimal
10,800,419
Country
US
Tail
N4083J
Type
A21N
No current signal · last broadcast 48m ago
Flights observed
219
Distinct callsigns
20
Country
US
Last broadcast
48m ago

Last known position

Most recent position reported by Mode-S A4CD23.

Country allocation

The ICAO 24-bit address A4CD23 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
JBU346 - 20 2026-07-09
JBU31 - 20 2026-07-01
JBU345 - 15 2026-07-09
JBU34 - 13 2026-07-07
JBU2220 JetBlue Airways 13 2026-07-06
JBU2260 - 12 2026-06-30
JBU1407 JetBlue Airways 12 2026-07-07
JBU32 - 11 2026-06-23
JBU2261 - 11 2026-06-30
JBU1408 - 11 2026-07-10
JBU1107 - 11 2026-07-13
JBU20 - 10 2026-07-12
JBU1620 JetBlue Airways 10 2026-06-10
JBU33 - 9 2026-07-10
JBU1621 JetBlue Airways 9 2026-06-11
JBU7 - 8 2026-07-12
JBU524 JetBlue Airways 4 2026-05-08
JBU332 - 4 2026-07-08
JBU8146 - 3 2026-06-15
JBU331 JetBlue Airways 3 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 JBU1107 - Jul 13, 13:05 UTCJul 13, 14:50 UTC1h 45m
2026-07-13 JBU1107 JFK → LHR Jul 13, 13:03 UTCJul 14, 08:45 UTC19h 43m
2026-07-13 JBU824 LAX → JFK Jul 13, 05:10 UTCJul 13, 10:20 UTC5h 10m
2026-07-12 JBU20 LHR → JFK Jul 12, 11:21 UTCJul 13, 10:40 UTC23h 20m
2026-07-12 JBU20 LHR → JFK Jul 12, 11:21 UTCJul 13, 10:40 UTC23h 20m
2026-07-12 JBU20 - Jul 12, 11:25 UTCJul 12, 12:40 UTC1h 15m
2026-07-12 JBU7 JFK → LHR Jul 12, 02:01 UTCJul 12, 08:30 UTC6h 30m
2026-07-11 JBU20 LHR → JFK Jul 11, 11:40 UTCJul 12, 10:45 UTC23h 6m
2026-07-11 JBU20 - Jul 11, 11:45 UTCJul 11, 12:45 UTC1h 0m
2026-07-11 JBU7 JFK → LHR Jul 11, 01:20 UTCJul 11, 07:55 UTC6h 35m
2026-07-10 JBU1408 - Jul 10, 10:35 UTCJul 10, 12:10 UTC1h 35m
2026-07-10 JBU1408 CDG → JFK Jul 10, 10:35 UTCJul 11, 08:01 UTC21h 26m
2026-07-10 JBU33 BOS → CDG Jul 10, 01:40 UTCJul 10, 08:10 UTC6h 30m
2026-07-09 JBU346 BCN → BOS Jul 9, 11:07 UTCJul 10, 10:45 UTC23h 38m
2026-07-09 JBU345 - Jul 9, 00:45 UTCJul 9, 08:05 UTC7h 20m
2026-07-09 JBU345 BOS → BCN Jul 9, 00:44 UTCJul 9, 19:55 UTC19h 11m
2026-07-08 JBU332 MXP → BOS Jul 8, 08:26 UTCJul 9, 06:45 UTC22h 20m
2026-07-07 JBU331 BDL → MCO Jul 7, 22:36 UTCJul 8, 16:40 UTC18h 5m
2026-07-07 JBU34 CDG → BOS Jul 7, 09:31 UTCJul 8, 08:45 UTC23h 15m
2026-07-07 JBU34 CDG → BOS Jul 7, 09:31 UTCJul 8, 08:45 UTC23h 15m
2026-07-07 JBU1407 JFK → CDG Jul 7, 00:26 UTCJul 7, 22:45 UTC22h 20m
2026-07-07 JBU1407 JFK → CDG Jul 7, 00:30 UTCJul 7, 06:45 UTC6h 15m
2026-07-06 JBU2220 LHR → JFK Jul 6, 13:25 UTCJul 6, 15:05 UTC1h 40m
2026-07-06 JBU2220 LHR → JFK Jul 6, 07:30 UTCJul 6, 13:20 UTC5h 50m
2026-07-05 JBU1107 JFK → LHR Jul 5, 13:30 UTCJul 5, 15:05 UTC1h 35m
2026-07-05 JBU1107 JFK → LHR Jul 5, 13:27 UTCJul 6, 08:55 UTC19h 29m
2026-07-04 JBU20 LHR → JFK Jul 4, 11:10 UTCJul 4, 12:40 UTC1h 30m
2026-07-04 JBU20 LHR → JFK Jul 4, 11:09 UTCJul 4, 19:15 UTC8h 7m
2026-07-04 JBU7 JFK → LHR Jul 4, 01:45 UTCJul 4, 08:20 UTC6h 35m
2026-07-03 JBU1408 MIA → EWR Jul 3, 12:32 UTCJul 4, 08:20 UTC19h 48m
2026-07-03 JBU33 BOS → CDG Jul 3, 04:14 UTCJul 4, 02:45 UTC22h 31m
2026-07-03 JBU33 - Jul 3, 04:15 UTCJul 3, 04:45 UTC30m
2026-07-01 JBU31 BOS → AMS Jul 1, 00:19 UTCJul 1, 17:30 UTC17h 12m
2026-06-30 JBU2260 MAD → BOS Jun 30, 12:35 UTCJul 1, 10:45 UTC22h 10m
2026-06-30 JBU2260 MAD → BOS Jun 30, 12:35 UTCJul 1, 10:45 UTC22h 10m
2026-06-30 JBU2261 - Jun 30, 02:35 UTCJun 30, 08:55 UTC6h 20m
2026-06-30 JBU2261 BOS → MAD Jun 30, 02:31 UTCJul 1, 00:45 UTC22h 14m
2026-06-29 JBU1407 JFK → CDG Jun 29, 00:10 UTCJun 29, 17:14 UTC17h 5m
2026-06-29 JBU1407 JFK → CDG Jun 29, 00:10 UTCJun 29, 01:50 UTC1h 40m
2026-06-28 JBU7 JFK → LHR Jun 28, 01:38 UTCJun 29, 00:44 UTC23h 7m
2026-06-28 JBU7 JFK → LHR Jun 28, 01:40 UTCJun 28, 07:54 UTC6h 15m
2026-06-27 JBU1408 MIA → EWR Jun 27, 11:39 UTCJun 27, 19:15 UTC7h 35m
2026-06-27 JBU33 BOS → CDG Jun 27, 01:39 UTCJun 27, 07:55 UTC6h 15m
2026-06-26 JBU346 - Jun 26, 11:24 UTCJun 26, 12:44 UTC1h 20m
2026-06-26 JBU346 BCN → BOS Jun 26, 11:22 UTCJun 27, 07:55 UTC20h 33m
2026-06-26 JBU345 BOS → BCN Jun 26, 00:50 UTCJun 26, 07:24 UTC6h 35m
2026-06-25 JBU2260 MAD → BOS Jun 25, 12:40 UTCJun 25, 20:09 UTC7h 30m
2026-06-25 JBU2261 BOS → MAD Jun 25, 02:44 UTCJun 25, 09:29 UTC6h 46m
2026-06-25 JBU2261 BOS → MAD Jun 25, 02:45 UTCJun 25, 09:29 UTC6h 45m
2026-06-24 JBU346 BCN → BOS Jun 24, 11:08 UTCJun 25, 09:29 UTC22h 22m

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 N4083J page for operator, model, and routing details .

Mode-S A4CD23 frequently asked

What is Mode-S code A4CD23?
A4CD23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4083J.
Where is Mode-S A4CD23 registered?
Mode-S code A4CD23 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 A4CD23 broadcasting right now?
No active broadcast right now. Last signal was 48m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CD23, octal 51146443, decimal 10,800,419.
What flights does A4CD23 operate?
Mode-S A4CD23 has broadcast 20 distinct callsigns, including JBU346, JBU31, JBU345, JBU34, JBU2220.