Apparatus

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sensors Mode-S transponder

A4C9D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4076J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A4C9D5
Octal
51144725
Decimal
10,799,573
Country
US
Tail
N4076J
Type
A21N
No current signal · last broadcast 1h ago
Flights observed
209
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A4C9D5.

Country allocation

The ICAO 24-bit address A4C9D5 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
JBU32 - 21 2026-07-13
JBU31 - 20 2026-07-13
JBU346 - 13 2026-07-04
JBU1407 JetBlue Airways 13 2026-06-26
JBU1107 JetBlue Airways 13 2026-06-24
JBU345 - 12 2026-07-04
JBU33 - 12 2026-06-22
JBU1408 JetBlue Airways 12 2026-06-22
JBU2261 - 11 2026-07-09
JBU2220 JetBlue Airways 11 2026-06-25
JBU34 JetBlue Airways 10 2026-06-12
JBU1621 - 10 2026-07-12
JBU7 - 8 2026-06-23
JBU331 JetBlue Airways 8 2026-07-06
JBU1620 - 8 2026-07-11
JBU2260 - 7 2026-07-02
JBU332 - 5 2026-07-07
JBU20 JetBlue Airways 5 2026-06-23
JBU523 JetBlue Airways 2 2026-05-07
JBU2223 JetBlue Airways 2 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 JBU32 - Jul 13, 09:35 UTCJul 13, 16:30 UTC6h 55m
2026-07-13 JBU32 AMS → BOS Jul 13, 09:32 UTCJul 14, 05:15 UTC19h 44m
2026-07-13 JBU31 BNH → AMS Jul 13, 00:25 UTCJul 13, 07:01 UTC6h 35m
2026-07-12 JBU1621 LHR → BOS Jul 12, 07:55 UTCJul 12, 14:45 UTC6h 50m
2026-07-11 JBU1620 - Jul 11, 23:25 UTCJul 12, 05:35 UTC6h 10m
2026-07-11 JBU32 - Jul 11, 09:40 UTCJul 11, 17:05 UTC7h 25m
2026-07-11 JBU31 BOS → AMS Jul 11, 00:35 UTCJul 11, 07:05 UTC6h 30m
2026-07-09 JBU1620 BOS → LHR Jul 9, 23:09 UTCJul 10, 15:30 UTC16h 21m
2026-07-09 JBU2261 - Jul 9, 03:00 UTCJul 9, 04:25 UTC1h 25m
2026-07-09 JBU2261 BOS → MAD Jul 9, 02:57 UTCJul 10, 00:25 UTC21h 28m
2026-07-08 JBU32 - Jul 8, 10:50 UTCJul 8, 18:05 UTC7h 15m
2026-07-08 JBU31 - Jul 8, 01:10 UTCJul 8, 07:55 UTC6h 45m
2026-07-07 JBU332 MXP → BOS Jul 7, 08:57 UTCJul 8, 07:15 UTC22h 19m
2026-07-06 JBU331 BDL → MCO Jul 6, 22:30 UTCJul 7, 17:50 UTC19h 21m
2026-07-06 JBU32 AMS → BOS Jul 6, 10:51 UTCJul 7, 09:15 UTC22h 25m
2026-07-06 JBU32 - Jul 6, 10:55 UTCJul 6, 11:15 UTC20m
2026-07-06 JBU31 - Jul 6, 02:20 UTCJul 6, 08:20 UTC6h 0m
2026-07-04 JBU331 BDL → MCO Jul 4, 22:32 UTCJul 5, 17:05 UTC18h 34m
2026-07-04 JBU346 BCN → BOS Jul 4, 11:16 UTCJul 5, 09:15 UTC21h 59m
2026-07-04 JBU346 - Jul 4, 11:20 UTCJul 4, 13:00 UTC1h 40m
2026-07-04 JBU345 - Jul 4, 00:40 UTCJul 4, 07:35 UTC6h 55m
2026-07-03 JBU32 AMS → BOS Jul 3, 09:44 UTCJul 4, 08:15 UTC22h 32m
2026-07-03 JBU32 - Jul 3, 09:45 UTCJul 3, 17:15 UTC7h 30m
2026-07-02 JBU2260 MAD → BOS Jul 2, 12:20 UTCJul 3, 11:15 UTC22h 55m
2026-07-02 JBU2261 BOS → MAD Jul 2, 03:00 UTCJul 3, 01:15 UTC22h 15m
2026-07-01 JBU346 - Jul 1, 11:20 UTCJul 1, 13:05 UTC1h 45m
2026-07-01 JBU346 BCN → BOS Jul 1, 11:17 UTCJul 2, 09:15 UTC21h 59m
2026-07-01 JBU345 BOS → BCN Jul 1, 01:15 UTCJul 1, 08:15 UTC7h 0m
2026-06-30 JBU31 BOS → AMS Jun 30, 00:38 UTCJun 30, 17:10 UTC16h 32m
2026-06-30 JBU31 - Jun 30, 00:39 UTCJun 30, 01:14 UTC35m
2026-06-29 JBU2260 MAD → BOS Jun 29, 12:34 UTCJun 29, 20:09 UTC7h 35m
2026-06-29 JBU2261 - Jun 29, 03:20 UTCJun 29, 09:29 UTC6h 10m
2026-06-28 JBU353 BOS → DUB Jun 28, 01:21 UTCJun 28, 21:55 UTC20h 34m
2026-06-27 JBU1034 TPA → BDL Jun 27, 07:24 UTCJun 27, 12:19 UTC4h 55m
2026-06-27 JBU1034 TPA → BDL Jun 27, 07:23 UTCJun 28, 06:55 UTC23h 32m
2026-06-26 JBU1633 BTV → JFK Jun 26, 23:30 UTCJun 27, 05:39 UTC6h 10m
2026-06-26 JBU1407 JFK → CDG Jun 26, 00:34 UTCJun 26, 23:15 UTC22h 41m
2026-06-25 JBU2220 LHR → JFK Jun 25, 07:54 UTCJun 25, 15:40 UTC7h 45m
2026-06-25 JBU2220 LHR → JFK Jun 25, 07:51 UTCJun 26, 07:14 UTC23h 24m
2026-06-24 JBU1107 JFK → LHR Jun 24, 13:05 UTCJun 24, 19:10 UTC6h 5m
2026-06-24 JBU1107 JFK → LHR Jun 24, 13:01 UTCJun 25, 09:10 UTC20h 9m
2026-06-23 JBU20 LHR → JFK Jun 23, 11:15 UTCJun 23, 19:00 UTC7h 45m
2026-06-23 JBU7 JFK → LHR Jun 23, 01:33 UTCJun 23, 19:00 UTC17h 27m
2026-06-23 JBU7 JFK → LHR Jun 23, 01:35 UTCJun 23, 08:09 UTC6h 35m
2026-06-22 JBU1408 MIA → EWR Jun 22, 11:24 UTCJun 22, 19:29 UTC8h 5m
2026-06-22 JBU33 BOS → CDG Jun 22, 02:30 UTCJun 22, 08:54 UTC6h 25m
2026-06-21 JBU1621 - Jun 21, 08:04 UTCJun 21, 09:15 UTC1h 10m
2026-06-21 JBU1621 LHR → BOS Jun 21, 08:00 UTCJun 22, 02:59 UTC19h 0m
2026-06-20 JBU1620 BOS → LHR Jun 20, 23:04 UTCJun 21, 05:20 UTC6h 15m
2026-06-20 JBU332 MXP → BOS Jun 20, 09:13 UTCJun 21, 05:20 UTC20h 7m

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 N4076J page for operator, model, and routing details .

Mode-S A4C9D5 frequently asked

What is Mode-S code A4C9D5?
A4C9D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4076J.
Where is Mode-S A4C9D5 registered?
Mode-S code A4C9D5 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 A4C9D5 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C9D5, octal 51144725, decimal 10,799,573.
What flights does A4C9D5 operate?
Mode-S A4C9D5 has broadcast 20 distinct callsigns, including JBU32, JBU31, JBU346, JBU1407, JBU1107.