sensors Mode-S transponder
A721A4
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N559JB · AIRBUS A-320 · operated by UMB BANK NA TRUSTEE
- Hex
- A721A4
- Octal
- 51620644
- Decimal
- 10,953,124
- Country
- US
- Tail
- N559JB
- Type
- A320
- Flights observed
- 276
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address A721A4 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 |
|---|---|---|---|
| JBU154 | JetBlue Airways | 6 | 2026-06-12 |
| JBU929 | JetBlue Airways | 5 | 2026-05-29 |
| JBU768 | JetBlue Airways | 4 | 2026-06-01 |
| JBU438 | - | 4 | 2026-06-26 |
| JBU2276 | JetBlue Airways | 4 | 2026-06-04 |
| JBU1145 | JetBlue Airways | 4 | 2026-06-22 |
| JBU706 | - | 3 | 2026-07-08 |
| JBU651 | - | 3 | 2026-07-04 |
| JBU2404 | JetBlue Airways | 3 | 2026-04-15 |
| JBU1168 | - | 3 | 2026-07-09 |
| JBU1153 | JetBlue Airways | 3 | 2026-04-25 |
| JBU1072 | JetBlue Airways | 3 | 2026-05-07 |
| JBU98 | JetBlue Airways | 2 | 2026-05-19 |
| JBU959 | JetBlue Airways | 2 | 2026-04-18 |
| JBU928 | JetBlue Airways | 2 | 2026-05-29 |
| JBU927 | JetBlue Airways | 2 | 2026-06-10 |
| JBU884 | JetBlue Airways | 2 | 2026-04-16 |
| JBU88 | JetBlue Airways | 2 | 2026-06-12 |
| JBU879 | - | 2 | 2026-04-17 |
| JBU8679 | - | 2 | 2026-04-25 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | JBU1129 | - | Jul 13, 10:05 UTC | Jul 13, 10:35 UTC | 30m |
| 2026-07-13 | JBU1129 | PVD → JFK | Jul 13, 10:02 UTC | Jul 14, 03:00 UTC | 16h 59m |
| 2026-07-12 | JBU1196 | - | Jul 12, 23:25 UTC | Jul 13, 02:01 UTC | 2h 35m |
| 2026-07-12 | JBU2925 | - | Jul 12, 18:55 UTC | Jul 12, 20:30 UTC | 1h 35m |
| 2026-07-12 | JBU2926 | - | Jul 12, 15:25 UTC | Jul 12, 17:01 UTC | 1h 35m |
| 2026-07-12 | JBU1754 | - | Jul 12, 11:10 UTC | Jul 12, 13:20 UTC | 2h 10m |
| 2026-07-12 | JBU2389 | EWR → SJU | Jul 12, 02:55 UTC | Jul 12, 06:15 UTC | 3h 20m |
| 2026-07-11 | JBU144 | - | Jul 11, 22:40 UTC | Jul 12, 01:05 UTC | 2h 25m |
| 2026-07-11 | JBU2449 | FLL → STI | Jul 11, 05:42 UTC | Jul 12, 03:35 UTC | 21h 54m |
| 2026-07-10 | JBU593 | EWR → STI | Jul 10, 19:59 UTC | Jul 11, 19:00 UTC | 23h 2m |
| 2026-07-09 | JBU1567 | - | Jul 9, 23:54 UTC | Jul 10, 20:45 UTC | 20h 51m |
| 2026-07-09 | JBU1168 | - | Jul 9, 18:55 UTC | Jul 9, 21:30 UTC | 2h 35m |
| 2026-07-09 | JBU1168 | - | Jul 9, 18:52 UTC | Jul 10, 16:40 UTC | 21h 48m |
| 2026-07-09 | JBU2143 | - | Jul 9, 15:10 UTC | Jul 9, 17:25 UTC | 2h 15m |
| 2026-07-09 | JBU456 | - | Jul 9, 10:50 UTC | Jul 9, 13:15 UTC | 2h 25m |
| 2026-07-08 | JBU305 | EWR → FLL | Jul 8, 23:55 UTC | Jul 9, 02:30 UTC | 2h 35m |
| 2026-07-08 | JBU2420 | - | Jul 8, 16:50 UTC | Jul 8, 21:10 UTC | 4h 20m |
| 2026-07-08 | JBU706 | - | Jul 8, 01:50 UTC | Jul 8, 04:20 UTC | 2h 30m |
| 2026-07-08 | JBU706 | FLL → EWR | Jul 8, 01:49 UTC | Jul 9, 00:45 UTC | 22h 57m |
| 2026-07-07 | JBU513 | - | Jul 7, 21:15 UTC | Jul 7, 23:45 UTC | 2h 30m |
| 2026-07-07 | JBU514 | - | Jul 7, 17:25 UTC | Jul 7, 19:45 UTC | 2h 20m |
| 2026-07-07 | JBU2625 | - | Jul 7, 14:10 UTC | Jul 7, 15:45 UTC | 1h 35m |
| 2026-07-07 | JBU2626 | - | Jul 7, 03:55 UTC | Jul 7, 05:30 UTC | 1h 35m |
| 2026-07-06 | JBU1579 | DCA → FLL | Jul 6, 23:20 UTC | Jul 7, 01:35 UTC | 2h 15m |
| 2026-07-06 | JBU1680 | - | Jul 6, 17:45 UTC | Jul 6, 19:45 UTC | 2h 0m |
| 2026-07-06 | JBU1197 | - | Jul 6, 12:45 UTC | Jul 6, 15:25 UTC | 2h 40m |
| 2026-07-05 | JBU1013 | MCO → CUN | Jul 5, 17:29 UTC | Jul 6, 15:25 UTC | 21h 56m |
| 2026-07-05 | JBU283 | JFK → MCO | Jul 5, 05:30 UTC | Jul 6, 02:55 UTC | 21h 25m |
| 2026-07-04 | JBU1084 | MCO → JFK | Jul 4, 22:54 UTC | Jul 5, 19:00 UTC | 20h 7m |
| 2026-07-04 | JBU651 | - | Jul 4, 14:45 UTC | Jul 4, 17:20 UTC | 2h 35m |
| 2026-07-04 | JBU651 | BOS → MCO | Jul 4, 14:43 UTC | Jul 5, 13:00 UTC | 22h 17m |
| 2026-07-04 | JBU651 | BOS → BOS | Jul 4, 14:15 UTC | Jul 4, 14:20 UTC | 5m |
| 2026-07-04 | JBU352 | MCO → BOS | Jul 4, 10:15 UTC | Jul 4, 12:45 UTC | 2h 30m |
| 2026-07-03 | JBU525 | PVD → SJU | Jul 3, 11:07 UTC | Jul 4, 11:00 UTC | 23h 54m |
| 2026-07-03 | JBU1075 | MCO → PVD | Jul 3, 00:12 UTC | Jul 3, 23:00 UTC | 22h 49m |
| 2026-07-02 | JBU2840 | NAS → MCO | Jul 2, 14:30 UTC | Jul 3, 11:50 UTC | 21h 20m |
| 2026-07-01 | JBU283 | JFK → MCO | Jul 1, 22:44 UTC | Jul 2, 21:00 UTC | 22h 16m |
| 2026-07-01 | JBU1084 | MCO → JFK | Jul 1, 18:24 UTC | Jul 2, 17:00 UTC | 22h 36m |
| 2026-07-01 | JBU1134 | SJU → MCO | Jul 1, 02:40 UTC | Jul 2, 01:00 UTC | 22h 21m |
| 2026-06-30 | JBU1366 | CUN → TPA | Jun 30, 18:09 UTC | Jul 1, 16:50 UTC | 22h 42m |
| 2026-06-30 | JBU1365 | TPA → CUN | Jun 30, 14:59 UTC | Jul 1, 13:00 UTC | 22h 2m |
| 2026-06-30 | JBU1365 | TPA → CUN | Jun 30, 15:00 UTC | Jun 30, 16:30 UTC | 1h 30m |
| 2026-06-30 | JBU891 | BOS → TPA | Jun 30, 10:45 UTC | Jun 30, 13:20 UTC | 2h 35m |
| 2026-06-28 | JBU1676 | KIN → FLL | Jun 28, 13:44 UTC | Jun 29, 00:54 UTC | 11h 11m |
| 2026-06-28 | JBU1675 | - | Jun 28, 11:14 UTC | Jun 28, 14:59 UTC | 3h 45m |
| 2026-06-28 | JBU1675 | FLL → KIN | Jun 28, 11:10 UTC | Jun 29, 00:54 UTC | 13h 45m |
| 2026-06-27 | JBU2890 | - | Jun 27, 10:10 UTC | Jun 27, 13:44 UTC | 3h 35m |
| 2026-06-27 | JBU2890 | SJU → EWR | Jun 27, 10:06 UTC | Jun 27, 19:05 UTC | 8h 59m |
| 2026-06-27 | JBU275 | - | Jun 27, 03:30 UTC | Jun 27, 03:49 UTC | 20m |
| 2026-06-27 | JBU275 | - | Jun 27, 00:29 UTC | Jun 27, 01:15 UTC | 45m |
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 N559JB page for operator, model, and routing details .