sensors Mode-S transponder
A4BEF6
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N4048J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP
- Hex
- A4BEF6
- Octal
- 51137366
- Decimal
- 10,796,790
- Country
- US
- Tail
- N4048J
- Type
- A21N
- Flights observed
- 105
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 3h ago
Current position
Country allocation
The ICAO 24-bit address A4BEF6 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 |
|---|---|---|---|
| JBU2261 | JetBlue Airways | 10 | 2026-05-20 |
| JBU34 | JetBlue Airways | 7 | 2026-05-26 |
| JBU2260 | JetBlue Airways | 7 | 2026-05-20 |
| JBU2220 | JetBlue Airways | 7 | 2026-05-25 |
| JBU1408 | JetBlue Airways | 7 | 2026-05-27 |
| JBU1407 | JetBlue Airways | 7 | 2026-05-29 |
| JBU1107 | JetBlue Airways | 7 | 2026-05-24 |
| JBU7 | JetBlue Airways | 6 | 2026-05-29 |
| JBU33 | JetBlue Airways | 6 | 2026-05-27 |
| JBU346 | JetBlue Airways | 4 | 2026-05-18 |
| JBU32 | JetBlue Airways | 4 | 2026-05-09 |
| JBU1621 | JetBlue Airways | 4 | 2026-05-21 |
| JBU2009 | - | 3 | 2026-04-13 |
| JBU20 | JetBlue Airways | 3 | 2026-05-29 |
| JBU1620 | JetBlue Airways | 3 | 2026-05-20 |
| JBU1191 | - | 3 | 2026-04-16 |
| JBU8517 | JetBlue Airways | 2 | 2026-05-10 |
| JBU692 | JetBlue Airways | 2 | 2026-04-16 |
| JBU466 | - | 2 | 2026-04-17 |
| JBU345 | JetBlue Airways | 2 | 2026-05-18 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | JBU1407 | JFK → CDG | May 29, 23:45 UTC | May 30, 01:35 UTC | 1h 50m |
| 2026-05-29 | JBU20 | LHR → JFK | May 29, 11:30 UTC | May 29, 18:35 UTC | 7h 5m |
| 2026-05-29 | JBU7 | JFK → LHR | May 29, 01:50 UTC | May 29, 08:45 UTC | 6h 55m |
| 2026-05-28 | JBU20 | LHR → JFK | May 28, 11:28 UTC | May 29, 08:45 UTC | 21h 17m |
| 2026-05-28 | JBU7 | JFK → LHR | May 28, 01:16 UTC | May 28, 18:40 UTC | 17h 24m |
| 2026-05-27 | JBU1408 | MIA → EWR | May 27, 11:05 UTC | May 27, 12:40 UTC | 1h 35m |
| 2026-05-27 | JBU1408 | MIA → EWR | May 27, 11:00 UTC | May 28, 08:00 UTC | 21h 0m |
| 2026-05-27 | JBU33 | BOS → SFO | May 27, 01:59 UTC | May 27, 08:55 UTC | 6h 56m |
| 2026-05-26 | JBU34 | SFO → BOS | May 26, 09:37 UTC | May 27, 08:55 UTC | 23h 19m |
| 2026-05-26 | JBU34 | SFO → BOS | May 26, 09:37 UTC | May 27, 08:55 UTC | 23h 19m |
| 2026-05-25 | JBU1407 | JFK → CDG | May 25, 23:42 UTC | May 26, 16:55 UTC | 17h 13m |
| 2026-05-25 | JBU1407 | JFK → CDG | May 25, 23:45 UTC | May 26, 01:20 UTC | 1h 35m |
| 2026-05-25 | JBU2220 | LHR → JFK | May 25, 07:25 UTC | May 25, 14:45 UTC | 7h 20m |
| 2026-05-24 | JBU1107 | JFK → LHR | May 24, 13:00 UTC | May 24, 19:45 UTC | 6h 45m |
| 2026-05-23 | JBU20 | LHR → JFK | May 23, 11:15 UTC | May 23, 19:10 UTC | 7h 56m |
| 2026-05-23 | JBU7 | JFK → LHR | May 23, 01:50 UTC | May 23, 08:10 UTC | 6h 20m |
| 2026-05-22 | JBU1408 | MIA → EWR | May 22, 10:45 UTC | May 22, 18:25 UTC | 7h 40m |
| 2026-05-22 | JBU33 | BOS → SFO | May 22, 01:55 UTC | May 22, 07:55 UTC | 6h 0m |
| 2026-05-21 | JBU1621 | LHR → BOS | May 21, 07:45 UTC | May 21, 09:05 UTC | 1h 20m |
| 2026-05-21 | JBU1621 | LHR → BOS | May 21, 07:44 UTC | May 22, 07:30 UTC | 23h 47m |
| 2026-05-20 | JBU1620 | BOS → LHR | May 20, 23:05 UTC | May 21, 05:20 UTC | 6h 15m |
| 2026-05-20 | JBU2260 | MAD → BOS | May 20, 11:55 UTC | May 20, 19:20 UTC | 7h 25m |
| 2026-05-20 | JBU2261 | LGA → PBI | May 20, 03:09 UTC | May 20, 04:35 UTC | 1h 26m |
| 2026-05-20 | JBU2261 | LGA → PBI | May 20, 03:10 UTC | May 20, 09:35 UTC | 6h 26m |
| 2026-05-18 | JBU346 | SRQ → JFK | May 18, 11:25 UTC | May 18, 13:10 UTC | 1h 46m |
| 2026-05-18 | JBU346 | SRQ → JFK | May 18, 11:30 UTC | May 18, 19:20 UTC | 7h 49m |
| 2026-05-18 | JBU345 | JFK → SRQ | May 18, 00:45 UTC | May 18, 07:30 UTC | 6h 45m |
| 2026-05-16 | JBU2261 | LGA → PBI | May 16, 03:10 UTC | May 16, 09:31 UTC | 6h 21m |
| 2026-05-16 | JBU2261 | LGA → PBI | May 16, 03:05 UTC | May 16, 19:50 UTC | 16h 46m |
| 2026-05-15 | JBU1621 | LHR → BOS | May 15, 07:50 UTC | May 15, 15:10 UTC | 7h 19m |
| 2026-05-14 | JBU1620 | BOS → LHR | May 14, 23:00 UTC | May 15, 05:10 UTC | 6h 10m |
| 2026-05-14 | JBU2260 | MAD → BOS | May 14, 19:25 UTC | May 14, 19:30 UTC | 5m |
| 2026-05-14 | JBU2260 | MAD → BOS | May 14, 11:50 UTC | May 14, 19:20 UTC | 7h 30m |
| 2026-05-14 | JBU2261 | LGA → PBI | May 14, 02:40 UTC | May 14, 09:10 UTC | 6h 30m |
| 2026-05-13 | JBU34 | SFO → BOS | May 13, 09:30 UTC | May 13, 16:55 UTC | 7h 25m |
| 2026-05-13 | JBU34 | SFO → BOS | May 13, 09:26 UTC | May 14, 04:00 UTC | 18h 35m |
| 2026-05-12 | JBU1407 | JFK → CDG | May 12, 23:50 UTC | May 13, 07:05 UTC | 7h 15m |
| 2026-05-12 | JBU1408 | MIA → EWR | May 12, 10:37 UTC | May 13, 09:30 UTC | 22h 54m |
| 2026-05-12 | JBU33 | BOS → SFO | May 12, 06:15 UTC | May 12, 07:55 UTC | 1h 40m |
| 2026-05-12 | JBU33 | BOS → SFO | May 12, 01:34 UTC | May 13, 01:25 UTC | 23h 52m |
| 2026-05-11 | JBU8518 | BOS → JFK | May 11, 20:55 UTC | May 11, 21:30 UTC | 35m |
| 2026-05-11 | JBU842 | DUB → JFK | May 11, 10:45 UTC | May 11, 18:00 UTC | 7h 16m |
| 2026-05-10 | JBU8517 | BOS → JFK | May 10, 16:04 UTC | May 10, 16:44 UTC | 40m |
| 2026-05-10 | JBU8517 | BOS → JFK | May 10, 16:01 UTC | May 11, 11:30 UTC | 19h 29m |
| 2026-05-09 | JBU32 | AMS → BOS | May 9, 10:10 UTC | May 9, 17:25 UTC | 7h 15m |
| 2026-05-09 | JBU32 | AMS → BOS | May 9, 10:07 UTC | May 10, 06:25 UTC | 20h 18m |
| 2026-05-09 | JBU31 | BOS → AMS | May 9, 00:15 UTC | May 9, 07:00 UTC | 6h 45m |
| 2026-05-08 | JBU32 | AMS → BOS | May 8, 09:29 UTC | May 9, 07:10 UTC | 21h 41m |
| 2026-05-08 | JBU32 | AMS → BOS | May 8, 09:34 UTC | May 8, 17:05 UTC | 7h 30m |
| 2026-05-07 | JBU2260 | MAD → BOS | May 7, 11:57 UTC | May 8, 11:14 UTC | 23h 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 N4048J page for operator, model, and routing details .