Apparatus

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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 Jul 26, 19:40 UTC
Flights observed
244
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:40 UTC

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
JBU31 JetBlue Airways 21 2026-07-23
JBU346 - 20 2026-07-09
JBU34 JetBlue Airways 16 2026-07-21
JBU345 - 15 2026-07-09
JBU2260 JetBlue Airways 15 2026-07-22
JBU2220 - 15 2026-07-20
JBU1107 JetBlue Airways 15 2026-07-26
JBU2261 JetBlue Airways 14 2026-07-22
JBU1407 - 14 2026-07-21
JBU33 JetBlue Airways 13 2026-07-24
JBU1408 JetBlue Airways 12 2026-07-24
JBU32 - 11 2026-06-23
JBU20 - 10 2026-07-12
JBU1620 JetBlue Airways 10 2026-06-10
JBU7 JetBlue Airways 9 2026-07-25
JBU1621 JetBlue Airways 9 2026-06-11
JBU524 JetBlue Airways 4 2026-05-08
JBU332 - 4 2026-07-08
JBU331 - 4 2026-07-15
JBU8146 - 3 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JBU1107 JFK → LHR Jul 26, 13:10 UTCJul 26, 19:40 UTC6h 31m
2026-07-26 JBU1107 JFK → LHR Jul 26, 13:10 UTCJul 26, 19:40 UTC6h 30m
2026-07-25 JBU7 JFK → LHR Jul 25, 01:38 UTCJul 25, 18:40 UTC17h 2m
2026-07-24 JBU1408 MIA → EWR Jul 24, 10:39 UTCJul 25, 08:15 UTC21h 36m
2026-07-24 JBU33 BOS → SFO Jul 24, 01:40 UTCJul 24, 08:00 UTC6h 20m
2026-07-24 JBU33 BOS → SFO Jul 24, 01:38 UTCJul 24, 18:25 UTC16h 47m
2026-07-23 JBU31 BOS → AMS Jul 23, 00:46 UTCJul 23, 17:05 UTC16h 19m
2026-07-22 JBU2260 MAD → BOS Jul 22, 12:25 UTCJul 22, 19:35 UTC7h 10m
2026-07-22 JBU2260 MAD → BOS Jul 22, 12:22 UTCJul 23, 10:45 UTC22h 23m
2026-07-22 JBU2261 LGA → PBI Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 JBU2261 LGA → PBI Jul 22, 03:10 UTCJul 22, 10:25 UTC7h 15m
2026-07-21 JBU34 SFO → BOS Jul 21, 09:40 UTCJul 21, 16:45 UTC7h 5m
2026-07-21 JBU1407 - Jul 21, 00:35 UTCJul 21, 07:20 UTC6h 45m
2026-07-20 JBU2220 - Jul 20, 07:40 UTCJul 20, 15:05 UTC7h 25m
2026-07-19 JBU1107 JFK → LHR Jul 19, 13:30 UTCJul 19, 20:00 UTC6h 30m
2026-07-19 JBU1107 JFK → LHR Jul 19, 13:28 UTCJul 20, 12:45 UTC23h 18m
2026-07-18 JBU33 BOS → SFO Jul 18, 01:45 UTCJul 18, 02:45 UTC1h 0m
2026-07-18 JBU33 BOS → SFO Jul 18, 01:40 UTCJul 18, 19:40 UTC18h 1m
2026-07-17 JBU2260 - Jul 17, 13:05 UTCJul 17, 20:15 UTC7h 10m
2026-07-17 JBU2261 - Jul 17, 02:59 UTCJul 17, 09:30 UTC6h 30m
2026-07-15 JBU331 BOS → MXP Jul 15, 22:52 UTCJul 16, 16:55 UTC18h 3m
2026-07-15 JBU34 - Jul 15, 09:30 UTCJul 15, 10:45 UTC1h 15m
2026-07-15 JBU34 CDG → BOS Jul 15, 09:30 UTCJul 16, 06:15 UTC20h 45m
2026-07-14 JBU1407 JFK → CDG Jul 14, 23:55 UTCJul 15, 07:00 UTC7h 5m
2026-07-14 JBU2220 - Jul 14, 08:00 UTCJul 14, 14:55 UTC6h 55m
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, 09:10 UTC20h 8m
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

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 Jul 26, 19:40 UTC.
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 JBU31, JBU346, JBU34, JBU345, JBU2260.