Apparatus

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sensors Mode-S transponder

A1CE99

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2151J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A1CE99
Octal
50347231
Decimal
10,604,185
Country
US
Tail
N2151J
Type
A21N
Broadcasting now · callsign JBU1523 · 31,675 ft
Flights observed
237
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A1CE99 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1CE99 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
JBU841 - 15 2026-07-14
JBU842 - 14 2026-07-13
JBU1079 - 14 2026-07-01
JBU115 JetBlue Airways 10 2026-05-05
JBU72 - 9 2026-06-26
JBU354 JetBlue Airways 9 2026-04-26
JBU1926 - 9 2026-07-07
JBU334 JetBlue Airways 8 2026-04-17
JBU1333 JetBlue Airways 8 2026-06-25
JBU1080 JetBlue Airways 8 2026-05-31
JBU1524 JetBlue Airways 7 2026-06-03
JBU1216 JetBlue Airways 7 2026-05-19
JBU353 - 6 2026-07-05
JBU1515 JetBlue Airways 6 2026-05-19
JBU133 JetBlue Airways 6 2026-04-24
JBU1734 JetBlue Airways 5 2026-04-24
JBU2233 JetBlue Airways 4 2026-04-15
JBU220 - 4 2026-07-06
JBU2104 - 4 2026-07-07
JBU834 JetBlue Airways 3 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JBU841 JFK → DUB Jul 14, 01:19 UTCJul 14, 17:30 UTC16h 12m
2026-07-13 JBU842 DUB → JFK Jul 13, 10:50 UTCJul 14, 07:35 UTC20h 46m
2026-07-13 JBU842 DUB → JFK Jul 13, 10:50 UTCJul 14, 07:35 UTC20h 46m
2026-07-13 JBU841 JFK → DUB Jul 13, 02:06 UTCJul 13, 17:35 UTC15h 30m
2026-07-13 JBU841 JFK → DUB Jul 13, 02:10 UTCJul 13, 08:20 UTC6h 10m
2026-07-12 JBU841 JFK → DUB Jul 12, 02:23 UTCJul 13, 02:15 UTC23h 53m
2026-07-11 JBU887 - Jul 11, 13:50 UTCJul 11, 17:15 UTC3h 25m
2026-07-11 JBU887 JFK → SXM Jul 11, 13:50 UTCJul 12, 11:35 UTC21h 46m
2026-07-10 JBU1548 - Jul 10, 01:55 UTCJul 10, 03:00 UTC1h 5m
2026-07-09 JBU1548 LAS → BUF Jul 9, 19:15 UTCJul 9, 23:50 UTC4h 35m
2026-07-09 JBU411 JFK → LAS Jul 9, 10:55 UTCJul 9, 15:50 UTC4h 55m
2026-07-09 JBU416 - Jul 9, 02:00 UTCJul 9, 07:00 UTC5h 0m
2026-07-08 JBU1833 - Jul 8, 14:55 UTCJul 8, 20:35 UTC5h 40m
2026-07-07 JBU1926 LGW → BOS Jul 7, 13:29 UTCJul 7, 20:50 UTC7h 22m
2026-07-07 JBU1926 LGW → BOS Jul 7, 13:30 UTCJul 7, 20:30 UTC7h 0m
2026-07-07 JBU2104 BOS → LGW Jul 7, 04:45 UTCJul 7, 11:00 UTC6h 15m
2026-07-06 JBU220 - Jul 6, 21:00 UTCJul 7, 02:15 UTC5h 15m
2026-07-06 JBU219 - Jul 6, 13:15 UTCJul 6, 18:30 UTC5h 15m
2026-07-06 JBU2120 - Jul 6, 03:55 UTCJul 6, 08:55 UTC5h 0m
2026-07-05 JBU319 - Jul 5, 20:35 UTCJul 6, 02:00 UTC5h 25m
2026-07-05 JBU353 BOS → DUB Jul 5, 01:26 UTCJul 6, 00:15 UTC22h 50m
2026-07-04 JBU1926 LGW → BOS Jul 4, 12:11 UTCJul 5, 10:15 UTC22h 4m
2026-07-04 JBU1926 LGW → BOS Jul 4, 12:15 UTCJul 4, 19:40 UTC7h 25m
2026-07-04 JBU2104 BOS → LGW Jul 4, 03:45 UTCJul 4, 09:50 UTC6h 5m
2026-07-03 JBU220 - Jul 3, 20:30 UTCJul 4, 01:35 UTC5h 5m
2026-07-03 JBU2120 SAN → BOS Jul 3, 05:15 UTCJul 3, 10:20 UTC5h 5m
2026-07-03 JBU2120 SAN → BOS Jul 3, 05:15 UTCJul 4, 04:15 UTC23h 1m
2026-07-02 JBU319 - Jul 2, 22:15 UTCJul 3, 03:55 UTC5h 40m
2026-07-02 JBU1926 LGW → BOS Jul 2, 11:55 UTCJul 2, 19:10 UTC7h 15m
2026-07-02 JBU2104 BOS → LGW Jul 2, 02:35 UTCJul 2, 08:50 UTC6h 15m
2026-07-01 JBU1079 BOS → EDI Jul 1, 02:49 UTCJul 1, 18:45 UTC15h 57m
2026-06-30 JBU1177 BOS → LAS Jun 30, 12:13 UTCJul 1, 08:50 UTC20h 38m
2026-06-29 JBU220 - Jun 29, 20:30 UTCJun 30, 01:19 UTC4h 50m
2026-06-29 JBU220 SAN → BOS Jun 29, 20:25 UTCJun 30, 20:15 UTC23h 51m
2026-06-29 JBU219 - Jun 29, 13:09 UTCJun 29, 18:49 UTC5h 40m
2026-06-28 JBU1387 BOS → LAX Jun 28, 22:33 UTCJun 29, 22:15 UTC23h 42m
2026-06-28 JBU1926 - Jun 28, 11:35 UTCJun 28, 13:00 UTC1h 25m
2026-06-28 JBU1926 LGW → BOS Jun 28, 11:34 UTCJun 29, 10:15 UTC22h 41m
2026-06-28 JBU1926 LGW → BOS Jun 28, 11:34 UTCJun 29, 10:15 UTC22h 41m
2026-06-28 JBU2104 - Jun 28, 02:20 UTCJun 28, 08:19 UTC6h 0m
2026-06-27 JBU808 - Jun 27, 22:55 UTCJun 27, 23:45 UTC50m
2026-06-27 JBU808 - Jun 27, 20:19 UTCJun 27, 20:29 UTC10m
2026-06-27 JBU808 - Jun 27, 18:45 UTCJun 27, 19:05 UTC20m
2026-06-27 JBU807 - Jun 27, 13:49 UTCJun 27, 17:14 UTC3h 25m
2026-06-27 JBU807 BOS → STT Jun 27, 13:47 UTCJun 27, 17:14 UTC3h 28m
2026-06-27 JBU488 - Jun 27, 05:55 UTCJun 27, 10:45 UTC4h 50m
2026-06-26 JBU72 EDI → JFK Jun 26, 11:34 UTCJun 26, 18:54 UTC7h 20m
2026-06-26 JBU72 EDI → JFK Jun 26, 11:33 UTCJun 27, 10:14 UTC22h 42m
2026-06-26 JBU1079 BOS → EDI Jun 26, 02:44 UTCJun 26, 08:34 UTC5h 50m
2026-06-25 JBU1333 BOS → SFO Jun 25, 10:39 UTCJun 25, 17:05 UTC6h 25m

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 N2151J page for operator, model, and routing details .

Mode-S A1CE99 frequently asked

What is Mode-S code A1CE99?
A1CE99 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2151J.
Where is Mode-S A1CE99 registered?
Mode-S code A1CE99 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 A1CE99 broadcasting right now?
Yes. Mode-S A1CE99 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1CE99, octal 50347231, decimal 10,604,185.
What flights does A1CE99 operate?
Mode-S A1CE99 has broadcast 20 distinct callsigns, including JBU841, JBU842, JBU1079, JBU115, JBU72.