sensors Mode-S transponder
A1A3A9
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N2043J · AIRBUS A-321neo · operated by UMB BANK N.A. TRUSTEE
- Hex
- A1A3A9
- Octal
- 50321651
- Decimal
- 10,593,193
- Country
- US
- Tail
- N2043J
- Type
- A21N
- Flights observed
- 112
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address A1A3A9 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 |
|---|---|---|---|
| JBU1329 | JetBlue Airways | 12 | 2026-05-15 |
| JBU505 | JetBlue Airways | 7 | 2026-05-29 |
| JBU1328 | JetBlue Airways | 6 | 2026-05-14 |
| JBU528 | JetBlue Airways | 5 | 2026-05-02 |
| JBU1383 | JetBlue Airways | 5 | 2026-05-14 |
| JBU509 | JetBlue Airways | 4 | 2026-05-06 |
| JBU939 | JetBlue Airways | 3 | 2026-05-21 |
| JBU569 | JetBlue Airways | 3 | 2026-04-20 |
| JBU470 | JetBlue Airways | 3 | 2026-05-04 |
| JBU2662 | JetBlue Airways | 3 | 2026-05-08 |
| JBU2210 | JetBlue Airways | 3 | 2026-05-13 |
| JBU1584 | JetBlue Airways | 3 | 2026-05-17 |
| JBU151 | JetBlue Airways | 3 | 2026-04-13 |
| JBU1256 | JetBlue Airways | 3 | 2026-05-29 |
| JBU1255 | JetBlue Airways | 3 | 2026-05-30 |
| JBU662 | JetBlue Airways | 2 | 2026-04-17 |
| JBU597 | JetBlue Airways | 2 | 2026-05-12 |
| JBU561 | JetBlue Airways | 2 | 2026-04-17 |
| JBU350 | JetBlue Airways | 2 | 2026-05-20 |
| JBU1878 | JetBlue Airways | 2 | 2026-04-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | JBU1255 | FLL → GYE | May 30, 15:45 UTC | May 30, 17:40 UTC | 1h 55m |
| 2026-05-29 | JBU1256 | GYE → FLL | May 29, 18:08 UTC | May 30, 16:15 UTC | 22h 8m |
| 2026-05-29 | JBU505 | EWR → FLL | May 29, 10:12 UTC | May 29, 22:25 UTC | 12h 14m |
| 2026-05-28 | JBU168 | CHS → BOS | May 28, 19:57 UTC | May 29, 14:00 UTC | 18h 3m |
| 2026-05-28 | JBU169 | BDL → FLL | May 28, 14:20 UTC | May 28, 23:40 UTC | 9h 20m |
| 2026-05-25 | JBU117 | BOS → ATL | May 25, 13:25 UTC | May 26, 00:35 UTC | 11h 9m |
| 2026-05-25 | JBU98 | DEN → JFK | May 25, 06:45 UTC | May 25, 09:50 UTC | 3h 5m |
| 2026-05-24 | JBU97 | JFK → DEN | May 24, 12:35 UTC | May 25, 05:30 UTC | 16h 55m |
| 2026-05-23 | JBU1052 | MCO → BOS | May 23, 22:05 UTC | May 24, 01:25 UTC | 3h 20m |
| 2026-05-23 | JBU1051 | JFK → CUN | May 23, 16:55 UTC | May 23, 20:15 UTC | 3h 21m |
| 2026-05-22 | JBU1604 | SJU → JFK | May 22, 21:10 UTC | May 22, 21:50 UTC | 40m |
| 2026-05-22 | JBU1604 | SJU → JFK | May 22, 18:25 UTC | May 22, 18:40 UTC | 15m |
| 2026-05-22 | JBU1603 | JFK → SJU | May 22, 16:15 UTC | May 22, 16:35 UTC | 20m |
| 2026-05-21 | JBU938 | SJD → JFK | May 21, 21:01 UTC | May 22, 18:40 UTC | 21h 40m |
| 2026-05-21 | JBU939 | JFK → SJD | May 21, 13:25 UTC | May 21, 22:15 UTC | 8h 50m |
| 2026-05-20 | JBU350 | GND → JFK | May 20, 20:36 UTC | May 21, 17:25 UTC | 20h 50m |
| 2026-05-20 | JBU350 | GND → JFK | May 20, 14:25 UTC | May 21, 01:20 UTC | 10h 55m |
| 2026-05-17 | JBU1584 | MCO → JFK | May 17, 15:25 UTC | May 17, 17:45 UTC | 2h 20m |
| 2026-05-17 | JBU1584 | MCO → JFK | May 17, 15:23 UTC | May 17, 17:50 UTC | 2h 28m |
| 2026-05-17 | JBU1483 | JFK → MCO | May 17, 11:25 UTC | May 17, 13:35 UTC | 2h 10m |
| 2026-05-15 | JBU1329 | GUA → JFK | May 15, 23:15 UTC | May 16, 03:40 UTC | 4h 25m |
| 2026-05-15 | JBU1329 | GUA → JFK | May 15, 22:40 UTC | May 15, 22:45 UTC | 5m |
| 2026-05-14 | JBU1383 | PWM → LGA | May 14, 16:10 UTC | May 14, 16:20 UTC | 10m |
| 2026-05-14 | JBU1328 | JFK → GUA | May 14, 11:55 UTC | May 14, 15:35 UTC | 3h 40m |
| 2026-05-13 | JBU2210 | JAX → BOS | May 13, 19:55 UTC | May 14, 18:15 UTC | 22h 21m |
| 2026-05-13 | JBU2210 | JAX → BOS | May 13, 14:55 UTC | May 13, 23:20 UTC | 8h 25m |
| 2026-05-12 | JBU597 | BOS → ATL | May 12, 10:08 UTC | May 13, 00:50 UTC | 14h 43m |
| 2026-05-12 | JBU596 | PUJ → BOS | May 12, 01:24 UTC | May 13, 00:15 UTC | 22h 52m |
| 2026-05-11 | JBU505 | EWR → FLL | May 11, 10:05 UTC | May 11, 13:55 UTC | 3h 50m |
| 2026-05-11 | JBU505 | EWR → FLL | May 11, 10:05 UTC | May 12, 04:00 UTC | 17h 56m |
| 2026-05-10 | JBU881 | JFK → UVF | May 10, 14:00 UTC | May 11, 00:19 UTC | 10h 20m |
| 2026-05-09 | JBU966 | BOS → ATL | May 9, 14:30 UTC | May 10, 02:39 UTC | 12h 10m |
| 2026-05-08 | JBU2662 | BGI → JFK | May 8, 14:20 UTC | May 9, 01:25 UTC | 11h 5m |
| 2026-05-07 | JBU2662 | BGI → JFK | May 7, 14:20 UTC | May 8, 01:09 UTC | 10h 49m |
| 2026-05-06 | JBU2210 | JAX → BOS | May 6, 19:53 UTC | May 7, 17:30 UTC | 21h 37m |
| 2026-05-06 | JBU509 | BOS → SEA | May 6, 14:25 UTC | May 6, 15:00 UTC | 35m |
| 2026-05-06 | JBU509 | BOS → SEA | May 6, 14:20 UTC | May 6, 23:35 UTC | 9h 15m |
| 2026-05-05 | JBU939 | JFK → SJD | May 5, 13:25 UTC | May 6, 01:05 UTC | 11h 40m |
| 2026-05-04 | JBU1329 | GUA → JFK | May 4, 22:25 UTC | May 5, 01:10 UTC | 2h 45m |
| 2026-05-04 | JBU1329 | GUA → JFK | May 4, 20:35 UTC | May 4, 20:55 UTC | 20m |
| 2026-05-04 | JBU1329 | GUA → JFK | May 4, 18:35 UTC | May 4, 18:50 UTC | 15m |
| 2026-05-04 | JBU1380 | FLL → GUA | May 4, 16:30 UTC | May 4, 17:30 UTC | 1h 0m |
| 2026-05-04 | JBU597 | BOS → ATL | May 4, 10:30 UTC | May 4, 13:10 UTC | 2h 40m |
| 2026-05-04 | JBU8560 | MCO → BOS | May 4, 08:55 UTC | May 4, 09:15 UTC | 20m |
| 2026-05-04 | JBU470 | FLL → BOS | May 4, 01:20 UTC | May 4, 04:00 UTC | 2h 40m |
| 2026-05-03 | JBU505 | EWR → FLL | May 3, 09:45 UTC | May 3, 21:35 UTC | 11h 50m |
| 2026-05-02 | JBU528 | MCO → EWR | May 2, 15:40 UTC | May 3, 03:20 UTC | 11h 40m |
| 2026-05-01 | JBU1383 | PWM → LGA | May 1, 18:25 UTC | May 1, 20:40 UTC | 2h 15m |
| 2026-05-01 | JBU1383 | PWM → LGA | May 1, 18:25 UTC | May 2, 16:10 UTC | 21h 46m |
| 2026-05-01 | JBU1328 | JFK → GUA | May 1, 12:40 UTC | May 1, 16:55 UTC | 4h 15m |
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 N2043J page for operator, model, and routing details .