Apparatus

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sensors Mode-S transponder

A4C98F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4074J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP

Hex
A4C98F
Octal
51144617
Decimal
10,799,503
Country
US
Tail
N4074J
Type
A21N
No current signal · last broadcast Jul 26, 17:15 UTC
Flights observed
204
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:15 UTC

Last known position

Most recent position reported by Mode-S A4C98F.

Country allocation

The ICAO 24-bit address A4C98F 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
JBU1621 JetBlue Airways 20 2026-07-23
JBU31 JetBlue Airways 17 2026-07-26
JBU1620 JetBlue Airways 15 2026-07-22
JBU32 JetBlue Airways 14 2026-07-26
JBU1408 JetBlue Airways 13 2026-06-28
JBU1107 JetBlue Airways 13 2026-06-30
JBU2220 JetBlue Airways 12 2026-07-01
JBU1407 JetBlue Airways 10 2026-07-04
JBU331 JetBlue Airways 9 2026-06-11
JBU33 - 9 2026-06-28
JBU2261 - 8 2026-07-16
JBU2260 - 8 2026-07-16
JBU20 JetBlue Airways 8 2026-06-29
JBU345 - 7 2026-07-05
JBU34 - 7 2026-07-04
JBU7 - 6 2026-06-29
JBU332 - 6 2026-06-11
JBU346 JetBlue Airways 4 2026-06-06
JBU8032 JetBlue Airways 3 2026-06-08
JBU8134 JetBlue Airways 2 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JBU32 AMS → BOS Jul 26, 09:30 UTCJul 26, 17:05 UTC7h 35m
2026-07-26 JBU31 BOS → AMS Jul 26, 00:25 UTCJul 26, 06:40 UTC6h 16m
2026-07-25 JBU32 AMS → BOS Jul 25, 09:45 UTCJul 25, 11:20 UTC1h 35m
2026-07-25 JBU32 AMS → BOS Jul 25, 09:41 UTCJul 26, 07:00 UTC21h 20m
2026-07-25 JBU31 BOS → AMS Jul 25, 00:40 UTCJul 25, 06:50 UTC6h 10m
2026-07-24 JBU32 AMS → BOS Jul 24, 09:32 UTCJul 25, 07:10 UTC21h 38m
2026-07-24 JBU31 BOS → AMS Jul 24, 00:55 UTCJul 24, 17:10 UTC16h 15m
2026-07-23 JBU1621 LHR → BOS Jul 23, 08:00 UTCJul 23, 09:15 UTC1h 15m
2026-07-23 JBU1621 LHR → BOS Jul 23, 07:58 UTCJul 24, 07:20 UTC23h 22m
2026-07-22 JBU1620 BOS → LHR Jul 22, 22:55 UTCJul 23, 05:15 UTC6h 20m
2026-07-22 JBU32 AMS → BOS Jul 22, 09:34 UTCJul 23, 05:15 UTC19h 41m
2026-07-22 JBU32 AMS → BOS Jul 22, 09:34 UTCJul 23, 05:15 UTC19h 41m
2026-07-22 JBU31 BOS → AMS Jul 22, 00:35 UTCJul 22, 02:05 UTC1h 30m
2026-07-22 JBU31 BOS → AMS Jul 22, 00:31 UTCJul 22, 23:45 UTC23h 14m
2026-07-21 JBU31 BOS → AMS Jul 21, 00:30 UTCJul 21, 01:45 UTC1h 15m
2026-07-21 JBU31 BOS → AMS Jul 21, 00:25 UTCJul 21, 23:20 UTC22h 55m
2026-07-20 JBU32 AMS → BOS Jul 20, 09:55 UTCJul 20, 17:05 UTC7h 10m
2026-07-20 JBU31 BOS → AMS Jul 20, 00:40 UTCJul 20, 07:10 UTC6h 30m
2026-07-19 JBU32 AMS → BOS Jul 19, 09:57 UTCJul 20, 09:45 UTC23h 49m
2026-07-19 JBU32 AMS → BOS Jul 19, 09:57 UTCJul 20, 09:45 UTC23h 49m
2026-07-19 JBU31 BOS → AMS Jul 19, 00:30 UTCJul 19, 01:45 UTC1h 15m
2026-07-19 JBU31 BOS → AMS Jul 19, 00:27 UTCJul 19, 17:40 UTC17h 14m
2026-07-18 JBU31 BOS → AMS Jul 18, 00:49 UTCJul 18, 18:30 UTC17h 42m
2026-07-17 JBU1621 LHR → BOS Jul 17, 08:27 UTCJul 18, 07:40 UTC23h 14m
2026-07-16 JBU1620 BOS → LHR Jul 16, 23:51 UTCJul 17, 23:45 UTC23h 54m
2026-07-16 JBU2260 - Jul 16, 12:44 UTCJul 16, 20:05 UTC7h 20m
2026-07-16 JBU2260 MAD → BOS Jul 16, 12:42 UTCJul 17, 09:45 UTC21h 3m
2026-07-16 JBU2261 BOS → MAD Jul 16, 02:50 UTCJul 16, 09:35 UTC6h 45m
2026-07-15 JBU620 - Jul 15, 17:50 UTCJul 15, 23:05 UTC5h 15m
2026-07-15 JBU619 BOS → SAN Jul 15, 10:20 UTCJul 15, 15:25 UTC5h 5m
2026-07-14 JBU1534 SFO → BOS Jul 14, 18:45 UTCJul 14, 23:50 UTC5h 4m
2026-07-14 JBU1534 SFO → BOS Jul 14, 18:43 UTCJul 15, 17:45 UTC23h 2m
2026-07-14 JBU1333 BOS → SFO Jul 14, 11:05 UTCJul 14, 16:40 UTC5h 35m
2026-07-05 JBU345 BOS → BCN Jul 5, 00:33 UTCJul 5, 19:40 UTC19h 7m
2026-07-04 JBU34 - Jul 4, 09:35 UTCJul 4, 11:05 UTC1h 30m
2026-07-04 JBU34 CDG → BOS Jul 4, 09:32 UTCJul 5, 07:20 UTC21h 49m
2026-07-04 JBU1407 JFK → CDG Jul 4, 00:20 UTCJul 4, 07:00 UTC6h 40m
2026-07-02 JBU8640 BOS → PSM Jul 2, 16:45 UTCJul 2, 17:05 UTC20m
2026-07-01 JBU2220 LHR → JFK Jul 1, 07:25 UTCJul 1, 13:45 UTC6h 20m
2026-07-01 JBU2220 LHR → JFK Jul 1, 07:22 UTCJul 1, 15:05 UTC7h 44m
2026-06-30 JBU1107 JFK → LHR Jun 30, 13:05 UTCJun 30, 19:25 UTC6h 20m
2026-06-29 JBU20 LHR → JFK Jun 29, 11:10 UTCJun 29, 18:25 UTC7h 15m
2026-06-29 JBU7 - Jun 29, 02:05 UTCJun 29, 08:19 UTC6h 15m
2026-06-28 JBU1408 MIA → EWR Jun 28, 10:44 UTCJun 28, 11:45 UTC1h 0m
2026-06-28 JBU1408 MIA → EWR Jun 28, 10:41 UTCJun 29, 08:19 UTC21h 39m
2026-06-28 JBU1408 MIA → EWR Jun 28, 10:41 UTCJun 29, 08:19 UTC21h 39m
2026-06-28 JBU33 - Jun 28, 01:59 UTCJun 28, 08:14 UTC6h 15m
2026-06-26 JBU1620 BOS → LHR Jun 26, 23:10 UTCJun 27, 15:14 UTC16h 5m
2026-06-26 JBU1621 - Jun 26, 08:05 UTCJun 26, 15:10 UTC7h 5m
2026-06-26 JBU1621 LHR → BOS Jun 26, 08:02 UTCJun 27, 05:19 UTC21h 18m

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 N4074J page for operator, model, and routing details .

Mode-S A4C98F frequently asked

What is Mode-S code A4C98F?
A4C98F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4074J.
Where is Mode-S A4C98F registered?
Mode-S code A4C98F 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 A4C98F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C98F, octal 51144617, decimal 10,799,503.
What flights does A4C98F operate?
Mode-S A4C98F has broadcast 20 distinct callsigns, including JBU1621, JBU31, JBU1620, JBU32, JBU1408.