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
Broadcasting now · callsign JBU33 · 29,750 ft
Flights observed
110
Distinct callsigns
20
Country
US
Last broadcast
11h ago

Current position

A4CD23 is currently broadcasting. Map zoomed to live position.

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 14 2026-05-27
JBU346 JetBlue Airways 11 2026-05-28
JBU2220 JetBlue Airways 9 2026-05-10
JBU34 JetBlue Airways 8 2026-05-17
JBU345 JetBlue Airways 7 2026-05-28
JBU1621 JetBlue Airways 7 2026-05-29
JBU1620 JetBlue Airways 7 2026-05-23
JBU32 JetBlue Airways 6 2026-05-25
JBU1407 JetBlue Airways 6 2026-05-16
JBU524 JetBlue Airways 4 2026-05-08
JBU2261 JetBlue Airways 4 2026-05-26
JBU2260 JetBlue Airways 4 2026-05-26
JBU1408 JetBlue Airways 4 2026-05-16
JBU332 JetBlue Airways 3 2026-05-24
JBU33 JetBlue Airways 3 2026-05-16
JBU2223 JetBlue Airways 3 2026-04-25
JBU1107 JetBlue Airways 3 2026-05-09
JBU604 JetBlue Airways 2 2026-05-08
JBU331 JetBlue Airways 2 2026-05-23
JBU7 JetBlue Airways 1 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JBU1621 LHR → BOS May 29, 07:55 UTCMay 29, 15:00 UTC7h 5m
2026-05-28 JBU346 SRQ → JFK May 28, 11:20 UTCMay 29, 09:15 UTC21h 55m
2026-05-28 JBU346 SRQ → JFK May 28, 11:25 UTCMay 28, 19:20 UTC7h 55m
2026-05-28 JBU345 JFK → SRQ May 28, 00:25 UTCMay 28, 07:15 UTC6h 50m
2026-05-27 JBU31 BOS → AMS May 27, 00:39 UTCMay 27, 16:50 UTC16h 11m
2026-05-26 JBU2260 MAD → BOS May 26, 12:24 UTCMay 26, 19:25 UTC7h 0m
2026-05-26 JBU2260 MAD → BOS May 26, 12:22 UTCMay 27, 10:45 UTC22h 23m
2026-05-26 JBU2261 LGA → PBI May 26, 02:39 UTCMay 26, 09:19 UTC6h 40m
2026-05-25 JBU32 AMS → BOS May 25, 10:35 UTCMay 25, 18:00 UTC7h 25m
2026-05-25 JBU31 BOS → AMS May 25, 05:10 UTCMay 25, 06:50 UTC1h 40m
2026-05-24 JBU332 LGA → BOS May 24, 08:20 UTCMay 24, 10:45 UTC2h 25m
2026-05-24 JBU332 LGA → BOS May 24, 08:16 UTCMay 25, 06:45 UTC22h 29m
2026-05-23 JBU331 BDL → MCO May 23, 23:10 UTCMay 24, 06:20 UTC7h 10m
2026-05-23 JBU1620 BOS → LHR May 23, 00:30 UTCMay 23, 01:50 UTC1h 20m
2026-05-23 JBU1620 BOS → LHR May 23, 00:30 UTCMay 23, 18:00 UTC17h 30m
2026-05-22 JBU31 BOS → AMS May 22, 00:37 UTCMay 22, 16:55 UTC16h 18m
2026-05-21 JBU332 LGA → BOS May 21, 09:22 UTCMay 22, 07:10 UTC21h 49m
2026-05-20 JBU331 BDL → MCO May 20, 23:36 UTCMay 21, 17:55 UTC18h 20m
2026-05-20 JBU346 SRQ → JFK May 20, 11:26 UTCMay 21, 10:45 UTC23h 20m
2026-05-20 JBU346 SRQ → JFK May 20, 11:30 UTCMay 20, 18:45 UTC7h 15m
2026-05-20 JBU345 JFK → SRQ May 20, 01:05 UTCMay 20, 08:00 UTC6h 56m
2026-05-19 JBU346 SRQ → JFK May 19, 12:50 UTCMay 19, 21:00 UTC8h 10m
2026-05-19 JBU345 JFK → SRQ May 19, 00:35 UTCMay 19, 07:40 UTC7h 5m
2026-05-18 JBU1621 LHR → BOS May 18, 08:07 UTCMay 19, 06:45 UTC22h 38m
2026-05-18 JBU1621 LHR → BOS May 18, 08:07 UTCMay 19, 06:45 UTC22h 38m
2026-05-17 JBU1620 BOS → LHR May 17, 23:03 UTCMay 18, 15:25 UTC16h 23m
2026-05-17 JBU1620 BOS → LHR May 17, 23:05 UTCMay 18, 05:20 UTC6h 15m
2026-05-17 JBU34 SFO → BOS May 17, 09:20 UTCMay 17, 16:55 UTC7h 35m
2026-05-16 JBU1407 JFK → CDG May 16, 23:45 UTCMay 17, 06:35 UTC6h 50m
2026-05-16 JBU1408 MIA → EWR May 16, 10:35 UTCMay 17, 06:35 UTC20h 1m
2026-05-16 JBU33 BOS → SFO May 16, 01:51 UTCMay 17, 00:40 UTC22h 50m
2026-05-15 JBU2260 MAD → BOS May 15, 12:02 UTCMay 16, 10:46 UTC22h 44m
2026-05-15 JBU2260 MAD → BOS May 15, 12:05 UTCMay 15, 12:45 UTC40m
2026-05-15 JBU2261 LGA → PBI May 15, 02:45 UTCMay 15, 09:05 UTC6h 20m
2026-05-11 JBU34 SFO → BOS May 11, 09:35 UTCMay 12, 08:45 UTC23h 11m
2026-05-11 JBU34 SFO → BOS May 11, 09:35 UTCMay 12, 08:45 UTC23h 11m
2026-05-10 JBU1407 JFK → CDG May 10, 23:37 UTCMay 11, 16:55 UTC17h 18m
2026-05-10 JBU2220 LHR → JFK May 10, 07:30 UTCMay 10, 08:45 UTC1h 15m
2026-05-10 JBU2220 LHR → JFK May 10, 07:29 UTCMay 11, 06:45 UTC23h 16m
2026-05-09 JBU1107 JFK → LHR May 9, 13:10 UTCMay 9, 19:49 UTC6h 40m
2026-05-08 JBU524 LAX → JFK May 8, 20:00 UTCMay 9, 01:00 UTC5h 0m
2026-05-08 JBU604 YVR → JFK May 8, 06:25 UTCMay 8, 08:44 UTC2h 20m
2026-05-08 JBU604 YVR → JFK May 8, 06:21 UTCMay 9, 01:00 UTC18h 39m
2026-05-07 JBU603 JFK → YVR May 7, 23:09 UTCMay 8, 04:49 UTC5h 40m
2026-05-07 JBU1408 MIA → EWR May 7, 10:45 UTCMay 7, 19:05 UTC8h 20m
2026-05-07 JBU33 BOS → SFO May 7, 06:30 UTCMay 7, 08:25 UTC1h 55m
2026-05-06 JBU1621 LHR → BOS May 6, 07:56 UTCMay 7, 06:45 UTC22h 49m
2026-05-05 JBU346 SRQ → JFK May 5, 11:15 UTCMay 5, 12:45 UTC1h 30m
2026-05-05 JBU346 SRQ → JFK May 5, 11:15 UTCMay 6, 09:15 UTC22h 1m
2026-05-05 JBU346 SRQ → JFK May 5, 11:15 UTCMay 6, 09:15 UTC22h 1m

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?
Yes. Mode-S A4CD23 is currently airborne.
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, JBU2220, JBU34, JBU345.