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
- Flights observed
- 102
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Last known position
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 | 12 | 2026-05-22 |
| JBU1620 | JetBlue Airways | 8 | 2026-05-21 |
| JBU1408 | JetBlue Airways | 8 | 2026-05-23 |
| JBU1107 | JetBlue Airways | 8 | 2026-05-25 |
| JBU1407 | JetBlue Airways | 7 | 2026-05-26 |
| JBU345 | JetBlue Airways | 6 | 2026-05-29 |
| JBU33 | JetBlue Airways | 6 | 2026-05-23 |
| JBU2220 | JetBlue Airways | 6 | 2026-05-26 |
| JBU20 | JetBlue Airways | 6 | 2026-05-24 |
| JBU34 | JetBlue Airways | 5 | 2026-05-27 |
| JBU2261 | JetBlue Airways | 5 | 2026-05-13 |
| JBU7 | JetBlue Airways | 4 | 2026-05-24 |
| JBU32 | JetBlue Airways | 4 | 2026-05-21 |
| JBU31 | JetBlue Airways | 4 | 2026-05-21 |
| JBU346 | JetBlue Airways | 3 | 2026-05-29 |
| JBU8134 | JetBlue Airways | 2 | 2026-04-18 |
| JBU331 | JetBlue Airways | 2 | 2026-05-19 |
| JBU2260 | JetBlue Airways | 2 | 2026-05-13 |
| JBU524 | JetBlue Airways | 1 | 2026-05-09 |
| JBU523 | JetBlue Airways | 1 | 2026-05-09 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | JBU346 | SRQ → JFK | May 29, 11:40 UTC | May 29, 13:20 UTC | 1h 40m |
| 2026-05-29 | JBU346 | SRQ → JFK | May 29, 11:37 UTC | May 29, 23:45 UTC | 12h 8m |
| 2026-05-29 | JBU345 | JFK → SRQ | May 29, 00:25 UTC | May 29, 07:20 UTC | 6h 55m |
| 2026-05-28 | JBU1926 | LGW → BOS | May 28, 11:55 UTC | May 28, 18:50 UTC | 6h 55m |
| 2026-05-28 | JBU2104 | BOS → LGW | May 28, 02:00 UTC | May 28, 08:25 UTC | 6h 25m |
| 2026-05-27 | JBU34 | SFO → BOS | May 27, 09:40 UTC | May 27, 16:45 UTC | 7h 5m |
| 2026-05-26 | JBU1407 | JFK → CDG | May 26, 23:49 UTC | May 27, 07:00 UTC | 7h 11m |
| 2026-05-26 | JBU2220 | LHR → JFK | May 26, 07:19 UTC | May 26, 14:35 UTC | 7h 15m |
| 2026-05-25 | JBU1107 | JFK → LHR | May 25, 13:05 UTC | May 25, 19:40 UTC | 6h 34m |
| 2026-05-24 | JBU20 | LHR → JFK | May 24, 11:10 UTC | May 24, 18:45 UTC | 7h 35m |
| 2026-05-24 | JBU7 | JFK → LHR | May 24, 01:30 UTC | May 24, 08:10 UTC | 6h 40m |
| 2026-05-23 | JBU1408 | MIA → EWR | May 23, 10:45 UTC | May 23, 18:50 UTC | 8h 5m |
| 2026-05-23 | JBU33 | BOS → SFO | May 23, 01:30 UTC | May 23, 07:30 UTC | 6h 0m |
| 2026-05-22 | JBU1621 | LHR → BOS | May 22, 07:55 UTC | May 23, 07:30 UTC | 23h 35m |
| 2026-05-21 | JBU1620 | BOS → LHR | May 21, 23:16 UTC | May 22, 14:55 UTC | 15h 40m |
| 2026-05-21 | JBU32 | AMS → BOS | May 21, 09:29 UTC | May 22, 05:10 UTC | 19h 42m |
| 2026-05-21 | JBU31 | BOS → AMS | May 21, 00:20 UTC | May 21, 01:30 UTC | 1h 10m |
| 2026-05-21 | JBU31 | BOS → AMS | May 21, 00:20 UTC | May 21, 23:45 UTC | 23h 26m |
| 2026-05-19 | JBU331 | BDL → MCO | May 19, 23:05 UTC | May 20, 16:50 UTC | 17h 46m |
| 2026-05-19 | JBU331 | BDL → MCO | May 19, 23:10 UTC | May 19, 23:40 UTC | 30m |
| 2026-05-17 | JBU346 | SRQ → JFK | May 17, 11:55 UTC | May 17, 20:01 UTC | 8h 5m |
| 2026-05-17 | JBU345 | JFK → SRQ | May 17, 00:40 UTC | May 17, 07:25 UTC | 6h 45m |
| 2026-05-16 | JBU31 | BOS → AMS | May 16, 00:44 UTC | May 16, 23:10 UTC | 22h 27m |
| 2026-05-15 | JBU32 | AMS → BOS | May 15, 09:43 UTC | May 16, 07:20 UTC | 21h 38m |
| 2026-05-15 | JBU32 | AMS → BOS | May 15, 09:45 UTC | May 15, 11:25 UTC | 1h 40m |
| 2026-05-15 | JBU31 | BOS → AMS | May 15, 00:35 UTC | May 15, 06:45 UTC | 6h 10m |
| 2026-05-14 | JBU1621 | LHR → BOS | May 14, 07:50 UTC | May 14, 15:05 UTC | 7h 15m |
| 2026-05-13 | JBU2260 | MAD → BOS | May 13, 11:55 UTC | May 14, 09:10 UTC | 21h 16m |
| 2026-05-13 | JBU2261 | LGA → PBI | May 13, 03:00 UTC | May 13, 09:40 UTC | 6h 40m |
| 2026-05-13 | JBU2261 | LGA → PBI | May 13, 02:58 UTC | May 13, 23:55 UTC | 20h 58m |
| 2026-05-12 | JBU34 | SFO → BOS | May 12, 09:30 UTC | May 12, 16:50 UTC | 7h 20m |
| 2026-05-12 | JBU34 | SFO → BOS | May 12, 09:27 UTC | May 13, 03:35 UTC | 18h 9m |
| 2026-05-12 | JBU1407 | JFK → CDG | May 12, 04:40 UTC | May 12, 06:20 UTC | 1h 40m |
| 2026-05-11 | JBU2220 | LHR → JFK | May 11, 07:30 UTC | May 12, 05:45 UTC | 22h 16m |
| 2026-05-10 | JBU1107 | JFK → LHR | May 10, 13:09 UTC | May 11, 08:45 UTC | 19h 36m |
| 2026-05-10 | JBU1107 | JFK → LHR | May 10, 13:10 UTC | May 10, 13:44 UTC | 35m |
| 2026-05-09 | JBU524 | LAX → JFK | May 9, 19:45 UTC | May 10, 00:34 UTC | 4h 50m |
| 2026-05-09 | JBU523 | JFK → LAX | May 9, 12:25 UTC | May 9, 18:00 UTC | 5h 35m |
| 2026-05-08 | JBU33 | BOS → SFO | May 8, 01:31 UTC | May 8, 18:25 UTC | 16h 54m |
| 2026-05-07 | JBU1621 | LHR → BOS | May 7, 07:55 UTC | May 7, 09:15 UTC | 1h 20m |
| 2026-05-07 | JBU1621 | LHR → BOS | May 7, 07:54 UTC | May 8, 07:44 UTC | 23h 51m |
| 2026-05-06 | JBU1620 | BOS → LHR | May 6, 22:40 UTC | May 7, 05:15 UTC | 6h 35m |
| 2026-05-05 | JBU1621 | LHR → BOS | May 5, 08:05 UTC | May 5, 09:20 UTC | 1h 15m |
| 2026-05-05 | JBU1621 | LHR → BOS | May 5, 08:01 UTC | May 6, 03:35 UTC | 19h 35m |
| 2026-05-04 | JBU1620 | BOS → LHR | May 4, 22:55 UTC | May 5, 05:15 UTC | 6h 20m |
| 2026-05-04 | JBU345 | JFK → SRQ | May 4, 00:15 UTC | May 4, 07:20 UTC | 7h 5m |
| 2026-05-04 | JBU345 | JFK → SRQ | May 4, 00:12 UTC | May 4, 23:45 UTC | 23h 34m |
| 2026-05-03 | JBU2260 | MAD → BOS | May 3, 12:30 UTC | May 3, 19:50 UTC | 7h 20m |
| 2026-05-03 | JBU2261 | LGA → PBI | May 3, 02:40 UTC | May 3, 09:10 UTC | 6h 29m |
| 2026-05-01 | JBU34 | SFO → BOS | May 1, 09:30 UTC | May 1, 16:35 UTC | 7h 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 .