Apparatus

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sensors Mode-S transponder

A4C2AD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4058J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORPORATION

Hex
A4C2AD
Octal
51141255
Decimal
10,797,741
Country
US
Tail
N4058J
Type
A21N
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
235
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A4C2AD.

Country allocation

The ICAO 24-bit address A4C2AD 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
JBU2220 - 15 2026-07-09
JBU1107 - 15 2026-07-08
JBU1408 JetBlue Airways 14 2026-07-06
JBU346 - 13 2026-07-13
JBU33 - 13 2026-07-06
JBU1407 - 12 2026-07-10
JBU345 - 11 2026-07-13
JBU34 - 11 2026-07-10
JBU2260 - 11 2026-07-20
JBU331 JetBlue Airways 10 2026-06-28
JBU2261 - 10 2026-07-20
JBU31 - 9 2026-06-29
JBU1621 JetBlue Airways 8 2026-05-01
JBU332 - 7 2026-06-28
JBU32 - 7 2026-06-29
JBU20 JetBlue Airways 6 2026-07-07
JBU7 - 5 2026-07-07
JBU1620 - 5 2026-06-18
JBU392 - 4 2026-07-16
JBU1833 JetBlue Airways 4 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JBU8019 BOS → TPA Jul 26, 14:40 UTCJul 26, 17:15 UTC2h 35m
2026-07-26 JBU8019 BOS → TPA Jul 26, 14:40 UTCJul 26, 21:15 UTC6h 36m
2026-07-25 JBU1833 BOS → SFO Jul 25, 11:55 UTCJul 25, 18:10 UTC6h 15m
2026-07-25 JBU1833 BOS → SFO Jul 25, 11:54 UTCJul 26, 01:10 UTC13h 16m
2026-07-23 JBU8434 BOS → JFK Jul 23, 23:45 UTCJul 24, 04:35 UTC4h 50m
2026-07-23 JBU8434 BOS → JFK Jul 23, 23:40 UTCJul 24, 04:40 UTC5h 0m
2026-07-23 JBU1633 BTV → JFK Jul 23, 02:40 UTCJul 23, 08:45 UTC6h 5m
2026-07-22 JBU1926 LGW → BOS Jul 22, 11:40 UTCJul 22, 18:45 UTC7h 5m
2026-07-22 JBU1926 LGW → BOS Jul 22, 11:37 UTCJul 23, 08:50 UTC21h 13m
2026-07-22 JBU2104 BOS → LGW Jul 22, 02:05 UTCJul 22, 03:30 UTC1h 25m
2026-07-20 JBU2260 - Jul 20, 12:50 UTCJul 20, 20:15 UTC7h 25m
2026-07-20 JBU2260 MAD → BOS Jul 20, 12:48 UTCJul 21, 07:35 UTC18h 47m
2026-07-20 JBU2261 - Jul 20, 03:25 UTCJul 20, 09:50 UTC6h 25m
2026-07-18 JBU1634 - Jul 18, 21:05 UTCJul 19, 02:10 UTC5h 5m
2026-07-18 JBU1833 BOS → SFO Jul 18, 11:55 UTCJul 18, 17:40 UTC5h 45m
2026-07-18 JBU2120 SAN → BOS Jul 18, 04:15 UTCJul 18, 09:20 UTC5h 5m
2026-07-17 JBU319 BOS → SAN Jul 17, 21:05 UTCJul 18, 02:25 UTC5h 20m
2026-07-17 JBU1310 - Jul 17, 15:00 UTCJul 17, 17:15 UTC2h 15m
2026-07-17 JBU109 - Jul 17, 11:20 UTCJul 17, 13:35 UTC2h 15m
2026-07-16 JBU392 BOS → BOS Jul 16, 20:15 UTCJul 16, 20:25 UTC10m
2026-07-16 JBU392 - Jul 16, 18:44 UTCJul 16, 19:55 UTC1h 10m
2026-07-16 JBU392 - Jul 16, 17:14 UTCJul 16, 18:40 UTC1h 25m
2026-07-16 JBU392 TPA → BOS Jul 16, 17:15 UTCJul 17, 15:15 UTC22h 0m
2026-07-16 JBU791 BOS → TPA Jul 16, 12:49 UTCJul 16, 15:30 UTC2h 40m
2026-07-15 JBU220 SAN → BOS Jul 15, 20:15 UTCJul 16, 01:25 UTC5h 10m
2026-07-15 JBU219 BOS → SAN Jul 15, 13:10 UTCJul 15, 18:15 UTC5h 5m
2026-07-15 JBU2120 - Jul 15, 04:05 UTCJul 15, 09:20 UTC5h 15m
2026-07-14 JBU319 BOS → SAN Jul 14, 21:05 UTCJul 15, 02:10 UTC5h 4m
2026-07-13 JBU346 - Jul 13, 12:40 UTCJul 13, 20:15 UTC7h 35m
2026-07-13 JBU345 BOS → BCN Jul 13, 00:54 UTCJul 13, 21:05 UTC20h 12m
2026-07-12 JBU2260 MAD → BOS Jul 12, 12:23 UTCJul 13, 11:15 UTC22h 53m
2026-07-11 JBU2260 MAD → BOS Jul 11, 13:40 UTCJul 12, 13:15 UTC23h 36m
2026-07-11 JBU2261 BOS → MAD Jul 11, 02:51 UTCJul 11, 21:20 UTC18h 30m
2026-07-10 JBU34 - Jul 10, 09:35 UTCJul 10, 10:35 UTC1h 0m
2026-07-10 JBU34 CDG → BOS Jul 10, 09:32 UTCJul 11, 09:15 UTC23h 44m
2026-07-10 JBU1407 JFK → CDG Jul 10, 00:00 UTCJul 10, 06:50 UTC6h 50m
2026-07-09 JBU2220 LHR → JFK Jul 9, 07:30 UTCJul 9, 14:50 UTC7h 20m
2026-07-08 JBU1107 JFK → LHR Jul 8, 13:15 UTCJul 8, 19:55 UTC6h 40m
2026-07-07 JBU20 LHR → JFK Jul 7, 11:15 UTCJul 7, 18:40 UTC7h 25m
2026-07-07 JBU7 JFK → LHR Jul 7, 01:45 UTCJul 7, 08:15 UTC6h 30m
2026-07-06 JBU1408 MIA → EWR Jul 6, 12:27 UTCJul 7, 11:15 UTC22h 49m
2026-07-06 JBU1408 MIA → EWR Jul 6, 12:27 UTCJul 7, 11:15 UTC22h 49m
2026-07-06 JBU33 BOS → CDG Jul 6, 03:37 UTCJul 7, 03:15 UTC23h 39m
2026-07-06 JBU33 BOS → CDG Jul 6, 03:40 UTCJul 6, 09:50 UTC6h 10m
2026-07-05 JBU34 CDG → BOS Jul 5, 10:03 UTCJul 6, 09:15 UTC23h 12m
2026-07-05 JBU1407 JFK → CDG Jul 5, 01:20 UTCJul 6, 01:15 UTC23h 55m
2026-07-04 JBU2220 LHR → JFK Jul 4, 07:25 UTCJul 4, 15:00 UTC7h 35m
2026-07-04 JBU2220 LHR → JFK Jul 4, 07:23 UTCJul 5, 07:15 UTC23h 53m
2026-07-03 JBU1107 JFK → LHR Jul 3, 13:12 UTCJul 4, 08:50 UTC19h 39m
2026-07-03 JBU1107 JFK → LHR Jul 3, 13:15 UTCJul 3, 14:55 UTC1h 40m

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 N4058J page for operator, model, and routing details .

Mode-S A4C2AD frequently asked

What is Mode-S code A4C2AD?
A4C2AD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4058J.
Where is Mode-S A4C2AD registered?
Mode-S code A4C2AD 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 A4C2AD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C2AD, octal 51141255, decimal 10,797,741.
What flights does A4C2AD operate?
Mode-S A4C2AD has broadcast 20 distinct callsigns, including JBU2220, JBU1107, JBU1408, JBU346, JBU33.