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 1h ago
Flights observed
102
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 JBU346 SRQ → JFK May 29, 11:40 UTCMay 29, 13:20 UTC1h 40m
2026-05-29 JBU346 SRQ → JFK May 29, 11:37 UTCMay 29, 23:45 UTC12h 8m
2026-05-29 JBU345 JFK → SRQ May 29, 00:25 UTCMay 29, 07:20 UTC6h 55m
2026-05-28 JBU1926 LGW → BOS May 28, 11:55 UTCMay 28, 18:50 UTC6h 55m
2026-05-28 JBU2104 BOS → LGW May 28, 02:00 UTCMay 28, 08:25 UTC6h 25m
2026-05-27 JBU34 SFO → BOS May 27, 09:40 UTCMay 27, 16:45 UTC7h 5m
2026-05-26 JBU1407 JFK → CDG May 26, 23:49 UTCMay 27, 07:00 UTC7h 11m
2026-05-26 JBU2220 LHR → JFK May 26, 07:19 UTCMay 26, 14:35 UTC7h 15m
2026-05-25 JBU1107 JFK → LHR May 25, 13:05 UTCMay 25, 19:40 UTC6h 34m
2026-05-24 JBU20 LHR → JFK May 24, 11:10 UTCMay 24, 18:45 UTC7h 35m
2026-05-24 JBU7 JFK → LHR May 24, 01:30 UTCMay 24, 08:10 UTC6h 40m
2026-05-23 JBU1408 MIA → EWR May 23, 10:45 UTCMay 23, 18:50 UTC8h 5m
2026-05-23 JBU33 BOS → SFO May 23, 01:30 UTCMay 23, 07:30 UTC6h 0m
2026-05-22 JBU1621 LHR → BOS May 22, 07:55 UTCMay 23, 07:30 UTC23h 35m
2026-05-21 JBU1620 BOS → LHR May 21, 23:16 UTCMay 22, 14:55 UTC15h 40m
2026-05-21 JBU32 AMS → BOS May 21, 09:29 UTCMay 22, 05:10 UTC19h 42m
2026-05-21 JBU31 BOS → AMS May 21, 00:20 UTCMay 21, 01:30 UTC1h 10m
2026-05-21 JBU31 BOS → AMS May 21, 00:20 UTCMay 21, 23:45 UTC23h 26m
2026-05-19 JBU331 BDL → MCO May 19, 23:05 UTCMay 20, 16:50 UTC17h 46m
2026-05-19 JBU331 BDL → MCO May 19, 23:10 UTCMay 19, 23:40 UTC30m
2026-05-17 JBU346 SRQ → JFK May 17, 11:55 UTCMay 17, 20:01 UTC8h 5m
2026-05-17 JBU345 JFK → SRQ May 17, 00:40 UTCMay 17, 07:25 UTC6h 45m
2026-05-16 JBU31 BOS → AMS May 16, 00:44 UTCMay 16, 23:10 UTC22h 27m
2026-05-15 JBU32 AMS → BOS May 15, 09:43 UTCMay 16, 07:20 UTC21h 38m
2026-05-15 JBU32 AMS → BOS May 15, 09:45 UTCMay 15, 11:25 UTC1h 40m
2026-05-15 JBU31 BOS → AMS May 15, 00:35 UTCMay 15, 06:45 UTC6h 10m
2026-05-14 JBU1621 LHR → BOS May 14, 07:50 UTCMay 14, 15:05 UTC7h 15m
2026-05-13 JBU2260 MAD → BOS May 13, 11:55 UTCMay 14, 09:10 UTC21h 16m
2026-05-13 JBU2261 LGA → PBI May 13, 03:00 UTCMay 13, 09:40 UTC6h 40m
2026-05-13 JBU2261 LGA → PBI May 13, 02:58 UTCMay 13, 23:55 UTC20h 58m
2026-05-12 JBU34 SFO → BOS May 12, 09:30 UTCMay 12, 16:50 UTC7h 20m
2026-05-12 JBU34 SFO → BOS May 12, 09:27 UTCMay 13, 03:35 UTC18h 9m
2026-05-12 JBU1407 JFK → CDG May 12, 04:40 UTCMay 12, 06:20 UTC1h 40m
2026-05-11 JBU2220 LHR → JFK May 11, 07:30 UTCMay 12, 05:45 UTC22h 16m
2026-05-10 JBU1107 JFK → LHR May 10, 13:09 UTCMay 11, 08:45 UTC19h 36m
2026-05-10 JBU1107 JFK → LHR May 10, 13:10 UTCMay 10, 13:44 UTC35m
2026-05-09 JBU524 LAX → JFK May 9, 19:45 UTCMay 10, 00:34 UTC4h 50m
2026-05-09 JBU523 JFK → LAX May 9, 12:25 UTCMay 9, 18:00 UTC5h 35m
2026-05-08 JBU33 BOS → SFO May 8, 01:31 UTCMay 8, 18:25 UTC16h 54m
2026-05-07 JBU1621 LHR → BOS May 7, 07:55 UTCMay 7, 09:15 UTC1h 20m
2026-05-07 JBU1621 LHR → BOS May 7, 07:54 UTCMay 8, 07:44 UTC23h 51m
2026-05-06 JBU1620 BOS → LHR May 6, 22:40 UTCMay 7, 05:15 UTC6h 35m
2026-05-05 JBU1621 LHR → BOS May 5, 08:05 UTCMay 5, 09:20 UTC1h 15m
2026-05-05 JBU1621 LHR → BOS May 5, 08:01 UTCMay 6, 03:35 UTC19h 35m
2026-05-04 JBU1620 BOS → LHR May 4, 22:55 UTCMay 5, 05:15 UTC6h 20m
2026-05-04 JBU345 JFK → SRQ May 4, 00:15 UTCMay 4, 07:20 UTC7h 5m
2026-05-04 JBU345 JFK → SRQ May 4, 00:12 UTCMay 4, 23:45 UTC23h 34m
2026-05-03 JBU2260 MAD → BOS May 3, 12:30 UTCMay 3, 19:50 UTC7h 20m
2026-05-03 JBU2261 LGA → PBI May 3, 02:40 UTCMay 3, 09:10 UTC6h 29m
2026-05-01 JBU34 SFO → BOS May 1, 09:30 UTCMay 1, 16:35 UTC7h 5m

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 1h ago.
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, JBU1620, JBU1408, JBU1107, JBU1407.