sensors Mode-S transponder
A1CF48
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N2156J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP
- Hex
- A1CF48
- Octal
- 50347510
- Decimal
- 10,604,360
- Country
- US
- Tail
- N2156J
- Type
- A21N
- Flights observed
- 144
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address A1CF48 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 |
|---|---|---|---|
| JBU133 | JetBlue Airways | 16 | 2026-04-16 |
| JBU1734 | JetBlue Airways | 11 | 2026-04-16 |
| JBU1079 | JetBlue Airways | 10 | 2026-05-26 |
| JBU123 | JetBlue Airways | 9 | 2026-05-20 |
| JBU1080 | JetBlue Airways | 9 | 2026-05-06 |
| JBU224 | JetBlue Airways | 8 | 2026-05-17 |
| JBU842 | JetBlue Airways | 6 | 2026-05-12 |
| JBU353 | JetBlue Airways | 6 | 2026-05-23 |
| JBU724 | JetBlue Airways | 5 | 2026-05-10 |
| JBU2124 | JetBlue Airways | 5 | 2026-05-19 |
| JBU1190 | JetBlue Airways | 5 | 2026-05-13 |
| JBU73 | JetBlue Airways | 3 | 2026-05-27 |
| JBU72 | JetBlue Airways | 3 | 2026-05-26 |
| JBU524 | JetBlue Airways | 3 | 2026-05-18 |
| JBU324 | JetBlue Airways | 3 | 2026-05-28 |
| JBU323 | JetBlue Airways | 3 | 2026-05-19 |
| JBU223 | JetBlue Airways | 3 | 2026-05-29 |
| JBU1723 | JetBlue Airways | 3 | 2026-05-17 |
| JBU1189 | JetBlue Airways | 3 | 2026-04-28 |
| JBU933 | JetBlue Airways | 2 | 2026-05-23 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | JBU223 | JFK → LAX | May 29, 11:05 UTC | May 29, 16:25 UTC | 5h 20m |
| 2026-05-29 | JBU223 | JFK → LAX | May 29, 11:01 UTC | May 29, 23:25 UTC | 12h 25m |
| 2026-05-28 | JBU324 | LAX → JFK | May 28, 19:25 UTC | May 29, 00:25 UTC | 5h 0m |
| 2026-05-28 | JBU687 | BOS → LAX | May 28, 12:00 UTC | May 28, 17:45 UTC | 5h 45m |
| 2026-05-28 | JBU1488 | LAX → BOS | May 28, 04:35 UTC | May 28, 09:35 UTC | 5h 0m |
| 2026-05-27 | JBU487 | BOS → LAX | May 27, 21:05 UTC | May 28, 02:50 UTC | 5h 45m |
| 2026-05-27 | JBU73 | JFK → BNA | May 27, 03:14 UTC | May 28, 02:00 UTC | 22h 46m |
| 2026-05-26 | JBU72 | SLC → JFK | May 26, 11:25 UTC | May 27, 09:40 UTC | 22h 15m |
| 2026-05-26 | JBU1079 | JFK → MBJ | May 26, 03:05 UTC | May 26, 04:00 UTC | 55m |
| 2026-05-26 | JBU1079 | JFK → MBJ | May 26, 03:01 UTC | May 27, 01:54 UTC | 22h 54m |
| 2026-05-25 | JBU834 | SFO → BOS | May 25, 19:59 UTC | May 26, 01:10 UTC | 5h 10m |
| 2026-05-25 | JBU1333 | BOS → SFO | May 25, 11:55 UTC | May 25, 18:00 UTC | 6h 5m |
| 2026-05-24 | JBU734 | SFO → BOS | May 24, 20:22 UTC | May 25, 19:59 UTC | 23h 38m |
| 2026-05-24 | JBU1534 | TPA → BDL | May 24, 04:10 UTC | May 24, 23:46 UTC | 19h 36m |
| 2026-05-23 | JBU933 | BDL → TPA | May 23, 18:55 UTC | May 24, 01:00 UTC | 6h 5m |
| 2026-05-23 | JBU933 | BDL → TPA | May 23, 18:55 UTC | May 24, 18:00 UTC | 23h 6m |
| 2026-05-23 | JBU353 | JFK → BUR | May 23, 01:30 UTC | May 24, 00:00 UTC | 22h 31m |
| 2026-05-22 | JBU1926 | LGW → BOS | May 22, 11:40 UTC | May 23, 10:00 UTC | 22h 20m |
| 2026-05-22 | JBU2104 | BOS → LGW | May 22, 02:06 UTC | May 23, 02:00 UTC | 23h 54m |
| 2026-05-22 | JBU2104 | BOS → LGW | May 22, 02:10 UTC | May 22, 03:20 UTC | 1h 10m |
| 2026-05-21 | JBU1388 | LAX → BOS | May 21, 18:20 UTC | May 21, 23:20 UTC | 5h 0m |
| 2026-05-21 | JBU223 | JFK → LAX | May 21, 10:55 UTC | May 21, 16:40 UTC | 5h 45m |
| 2026-05-20 | JBU123 | JFK → LAX | May 20, 10:35 UTC | May 20, 16:20 UTC | 5h 45m |
| 2026-05-20 | JBU123 | JFK → LAX | May 20, 10:34 UTC | May 21, 03:05 UTC | 16h 32m |
| 2026-05-19 | JBU2124 | LAX → JFK | May 19, 22:40 UTC | May 20, 03:35 UTC | 4h 55m |
| 2026-05-19 | JBU323 | JFK → LAX | May 19, 15:05 UTC | May 19, 20:35 UTC | 5h 30m |
| 2026-05-18 | JBU524 | LAX → JFK | May 18, 19:45 UTC | May 19, 01:05 UTC | 5h 20m |
| 2026-05-18 | JBU523 | JFK → LAX | May 18, 11:40 UTC | May 18, 17:20 UTC | 5h 40m |
| 2026-05-17 | JBU224 | LAX → JFK | May 17, 14:10 UTC | May 17, 19:05 UTC | 4h 55m |
| 2026-05-17 | JBU224 | LAX → JFK | May 17, 14:06 UTC | May 18, 14:00 UTC | 23h 55m |
| 2026-05-17 | JBU1723 | JFK → LAX | May 17, 01:50 UTC | May 17, 07:20 UTC | 5h 30m |
| 2026-05-16 | JBU224 | LAX → JFK | May 16, 14:35 UTC | May 16, 19:50 UTC | 5h 15m |
| 2026-05-16 | JBU1723 | JFK → LAX | May 16, 01:20 UTC | May 16, 06:41 UTC | 5h 21m |
| 2026-05-15 | JBU123 | JFK → LAX | May 15, 10:30 UTC | May 15, 15:50 UTC | 5h 19m |
| 2026-05-15 | JBU123 | JFK → LAX | May 15, 10:28 UTC | May 16, 06:41 UTC | 20h 13m |
| 2026-05-13 | JBU524 | LAX → JFK | May 13, 20:10 UTC | May 14, 01:40 UTC | 5h 30m |
| 2026-05-13 | JBU524 | LAX → JFK | May 13, 20:06 UTC | May 14, 01:40 UTC | 5h 35m |
| 2026-05-13 | JBU523 | JFK → LAX | May 13, 11:45 UTC | May 13, 17:10 UTC | 5h 25m |
| 2026-05-13 | JBU1190 | SAN → JFK | May 13, 04:15 UTC | May 13, 09:05 UTC | 4h 50m |
| 2026-05-12 | JBU842 | DUB → JFK | May 12, 10:35 UTC | May 12, 17:30 UTC | 6h 55m |
| 2026-05-12 | JBU842 | DUB → JFK | May 12, 10:33 UTC | May 13, 09:15 UTC | 22h 43m |
| 2026-05-11 | JBU224 | LAX → JFK | May 11, 14:20 UTC | May 11, 19:15 UTC | 4h 56m |
| 2026-05-11 | JBU224 | LAX → JFK | May 11, 14:15 UTC | May 12, 11:25 UTC | 21h 11m |
| 2026-05-11 | JBU1723 | JFK → LAX | May 11, 01:55 UTC | May 11, 07:20 UTC | 5h 25m |
| 2026-05-10 | JBU724 | STI → BOS | May 10, 18:55 UTC | May 10, 23:55 UTC | 5h 0m |
| 2026-05-10 | JBU123 | JFK → LAX | May 10, 11:50 UTC | May 10, 17:25 UTC | 5h 35m |
| 2026-05-10 | JBU158 | AUA → JFK | May 10, 01:00 UTC | May 10, 02:10 UTC | 1h 10m |
| 2026-05-09 | JBU158 | AUA → JFK | May 9, 21:34 UTC | May 9, 21:50 UTC | 15m |
| 2026-05-09 | JBU1457 | JFK → AUA | May 9, 15:35 UTC | May 9, 19:30 UTC | 3h 55m |
| 2026-05-08 | JBU2124 | LAX → JFK | May 8, 22:29 UTC | May 9, 21:50 UTC | 23h 21m |
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 N2156J page for operator, model, and routing details .