Apparatus

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sensors Mode-S transponder

A4C5D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4064J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A4C5D8
Octal
51142730
Decimal
10,798,552
Country
US
Tail
N4064J
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
230
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A4C5D8.

Country allocation

The ICAO 24-bit address A4C5D8 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
JBU1408 JetBlue Airways 21 2026-07-05
JBU33 - 18 2026-07-14
JBU1621 - 18 2026-07-09
JBU1407 JetBlue Airways 15 2026-07-06
JBU7 - 14 2026-07-01
JBU2260 - 13 2026-07-03
JBU1620 - 13 2026-07-08
JBU2261 - 12 2026-07-08
JBU20 JetBlue Airways 11 2026-06-26
JBU332 - 10 2026-07-12
JBU2220 JetBlue Airways 10 2026-06-18
JBU331 JetBlue Airways 9 2026-07-09
JBU1107 JetBlue Airways 8 2026-06-17
JBU346 - 5 2026-07-11
JBU34 - 5 2026-07-02
JBU32 - 5 2026-06-21
JBU31 - 5 2026-06-21
JBU123 - 5 2026-04-13
JBU588 JetBlue Airways 4 2026-04-14
JBU524 JetBlue Airways 4 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JBU33 - Jul 14, 03:25 UTCJul 14, 04:50 UTC1h 25m
2026-07-13 JBU1534 SFO → BOS Jul 13, 19:25 UTCJul 14, 00:45 UTC5h 20m
2026-07-13 JBU1333 BOS → SFO Jul 13, 12:00 UTCJul 13, 17:40 UTC5h 40m
2026-07-13 JBU1333 - Jul 13, 11:10 UTCJul 13, 11:15 UTC5m
2026-07-12 JBU332 MXP → BOS Jul 12, 10:15 UTCJul 13, 01:05 UTC14h 51m
2026-07-12 JBU332 MXP → BOS Jul 12, 10:15 UTCJul 13, 01:05 UTC14h 51m
2026-07-11 JBU346 BCN → BOS Jul 11, 12:06 UTCJul 12, 12:01 UTC23h 55m
2026-07-11 JBU346 - Jul 11, 12:10 UTCJul 11, 14:00 UTC1h 50m
2026-07-11 JBU345 - Jul 11, 00:50 UTCJul 11, 07:50 UTC7h 0m
2026-07-09 JBU331 BDL → MCO Jul 9, 22:25 UTCJul 9, 23:35 UTC1h 10m
2026-07-09 JBU331 BDL → MCO Jul 9, 22:24 UTCJul 10, 20:30 UTC22h 6m
2026-07-09 JBU1621 LHR → BOS Jul 9, 08:05 UTCJul 9, 15:00 UTC6h 55m
2026-07-08 JBU1620 BOS → LHR Jul 8, 22:50 UTCJul 9, 05:15 UTC6h 25m
2026-07-08 JBU2261 BOS → MAD Jul 8, 02:45 UTCJul 9, 00:10 UTC21h 26m
2026-07-07 JBU1621 - Jul 7, 09:45 UTCJul 7, 17:05 UTC7h 20m
2026-07-07 JBU1621 LHR → BOS Jul 7, 09:44 UTCJul 8, 08:00 UTC22h 17m
2026-07-06 JBU1620 - Jul 6, 23:10 UTCJul 7, 05:20 UTC6h 10m
2026-07-06 JBU1407 JFK → CDG Jul 6, 02:25 UTCJul 7, 00:30 UTC22h 5m
2026-07-05 JBU1408 MIA → EWR Jul 5, 14:30 UTCJul 5, 22:30 UTC8h 0m
2026-07-05 JBU1408 MIA → EWR Jul 5, 14:27 UTCJul 6, 13:00 UTC22h 33m
2026-07-05 JBU33 BOS → CDG Jul 5, 01:48 UTCJul 5, 03:00 UTC1h 12m
2026-07-05 JBU33 BOS → CDG Jul 5, 01:50 UTCJul 5, 08:15 UTC6h 25m
2026-07-04 JBU332 MXP → BOS Jul 4, 09:23 UTCJul 5, 08:00 UTC22h 37m
2026-07-04 JBU332 MXP → BOS Jul 4, 09:25 UTCJul 4, 17:45 UTC8h 20m
2026-07-03 JBU2260 MAD → BOS Jul 3, 12:42 UTCJul 4, 11:30 UTC22h 48m
2026-07-03 JBU2260 MAD → BOS Jul 3, 12:42 UTCJul 4, 11:30 UTC22h 48m
2026-07-03 JBU2261 BOS → MAD Jul 3, 02:50 UTCJul 4, 01:15 UTC22h 25m
2026-07-02 JBU34 CDG → BOS Jul 2, 09:30 UTCJul 3, 04:10 UTC18h 40m
2026-07-02 JBU1407 JFK → CDG Jul 2, 00:18 UTCJul 2, 20:10 UTC19h 53m
2026-07-02 JBU1407 JFK → CDG Jul 2, 00:20 UTCJul 2, 07:10 UTC6h 50m
2026-07-01 JBU7 JFK → LHR Jul 1, 01:33 UTCJul 2, 00:00 UTC22h 28m
2026-06-30 JBU1408 MIA → EWR Jun 30, 11:40 UTCJun 30, 13:40 UTC2h 0m
2026-06-30 JBU1408 MIA → EWR Jun 30, 11:39 UTCJul 1, 08:10 UTC20h 32m
2026-06-30 JBU33 BOS → CDG Jun 30, 01:35 UTCJun 30, 07:40 UTC6h 5m
2026-06-29 JBU1621 - Jun 29, 10:24 UTCJun 29, 17:34 UTC7h 10m
2026-06-29 JBU1621 LHR → BOS Jun 29, 10:23 UTCJun 30, 07:40 UTC21h 18m
2026-06-28 JBU2260 - Jun 28, 12:29 UTCJun 28, 20:19 UTC7h 50m
2026-06-28 JBU2260 MAD → BOS Jun 28, 12:28 UTCJun 29, 11:45 UTC23h 17m
2026-06-28 JBU2261 - Jun 28, 03:09 UTCJun 28, 09:15 UTC6h 5m
2026-06-27 JBU34 - Jun 27, 09:50 UTCJun 27, 17:20 UTC7h 30m
2026-06-27 JBU1407 JFK → CDG Jun 27, 00:01 UTCJun 27, 06:40 UTC6h 39m
2026-06-27 JBU1407 JFK → CDG Jun 27, 00:05 UTCJun 27, 06:40 UTC6h 35m
2026-06-26 JBU20 LHR → JFK Jun 26, 11:24 UTCJun 26, 19:04 UTC7h 40m
2026-06-26 JBU7 - Jun 26, 01:34 UTCJun 26, 07:55 UTC6h 20m
2026-06-25 JBU1408 MIA → EWR Jun 25, 10:59 UTCJun 25, 12:30 UTC1h 30m
2026-06-25 JBU1408 MIA → EWR Jun 25, 10:56 UTCJun 26, 07:55 UTC20h 59m
2026-06-25 JBU1408 MIA → EWR Jun 25, 10:56 UTCJun 26, 07:55 UTC20h 59m
2026-06-25 JBU33 - Jun 25, 01:40 UTCJun 25, 07:54 UTC6h 15m
2026-06-24 JBU1621 - Jun 24, 07:59 UTCJun 24, 09:09 UTC1h 10m
2026-06-24 JBU1621 LHR → BOS Jun 24, 07:54 UTCJun 25, 02:59 UTC19h 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 N4064J page for operator, model, and routing details .

Mode-S A4C5D8 frequently asked

What is Mode-S code A4C5D8?
A4C5D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4064J.
Where is Mode-S A4C5D8 registered?
Mode-S code A4C5D8 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 A4C5D8 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C5D8, octal 51142730, decimal 10,798,552.
What flights does A4C5D8 operate?
Mode-S A4C5D8 has broadcast 20 distinct callsigns, including JBU1408, JBU33, JBU1621, JBU1407, JBU7.