sensors Mode-S transponder
4D2104
ICAO 24-bit transponder address · allocated to Malta
Currently assigned to 9H-BOO · BOMBARDIER Regional Jet CRJ-200
- Hex
- 4D2104
- Octal
- 23220404
- Decimal
- 5,054,724
- Country
- MT
- Tail
- 9H-BOO
- Type
- CRJ2
- Flights observed
- 102
- Distinct callsigns
- 20
- Country
- MT
- Last broadcast
- Jul 26, 07:35 UTC
Last known position
Country allocation
The ICAO 24-bit address 4D2104 falls within the block assigned to Malta (MT) by ICAO Annex 10, Volume III. Every aircraft registered in Malta 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 |
|---|---|---|---|
| AXY313A | - | 3 | 2026-04-13 |
| AXY979N | - | 2 | 2026-06-15 |
| AXY99BT | - | 1 | 2026-05-20 |
| AXY997P | - | 1 | 2026-06-15 |
| AXY996B | - | 1 | 2026-05-23 |
| AXY963N | - | 1 | 2026-07-26 |
| AXY956C | - | 1 | 2026-05-22 |
| AXY955W | - | 1 | 2026-04-29 |
| AXY943T | - | 1 | 2026-05-06 |
| AXY928S | - | 1 | 2026-05-26 |
| AXY925R | - | 1 | 2026-06-30 |
| AXY917R | - | 1 | 2026-07-05 |
| AXY915M | - | 1 | 2026-06-19 |
| AXY913S | - | 1 | 2026-07-03 |
| AXY903H | - | 1 | 2026-05-09 |
| AXY890E | - | 1 | 2026-06-14 |
| AXY888Y | - | 1 | 2026-05-08 |
| AXY883A | - | 1 | 2026-07-18 |
| AXY879H | - | 1 | 2026-05-21 |
| AXY877N | - | 1 | 2026-06-09 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | AXY963N | - | Jul 26, 05:55 UTC | Jul 26, 07:35 UTC | 1h 41m |
| 2026-07-25 | AXY827K | - | Jul 25, 05:25 UTC | Jul 25, 07:40 UTC | 2h 15m |
| 2026-07-24 | AXY312E | - | Jul 24, 16:05 UTC | Jul 24, 18:15 UTC | 2h 10m |
| 2026-07-24 | AXY391P | - | Jul 24, 06:50 UTC | Jul 24, 08:30 UTC | 1h 40m |
| 2026-07-23 | AXY757P | - | Jul 23, 09:45 UTC | Jul 23, 11:40 UTC | 1h 55m |
| 2026-07-21 | AXY155Y | - | Jul 21, 15:45 UTC | Jul 21, 16:55 UTC | 1h 10m |
| 2026-07-20 | AXY213N | - | Jul 20, 16:55 UTC | Jul 20, 17:35 UTC | 40m |
| 2026-07-20 | AXY319J | - | Jul 20, 08:20 UTC | Jul 20, 09:35 UTC | 1h 15m |
| 2026-07-18 | AXY883A | - | Jul 18, 19:25 UTC | Jul 18, 20:20 UTC | 55m |
| 2026-07-17 | AXY331A | - | Jul 17, 20:04 UTC | Jul 17, 20:50 UTC | 45m |
| 2026-07-17 | AXY580S | MME → FAO | Jul 17, 13:15 UTC | Jul 17, 16:00 UTC | 2h 45m |
| 2026-07-15 | AXY118K | - | Jul 15, 12:25 UTC | Jul 15, 14:10 UTC | 1h 45m |
| 2026-07-14 | AXY570P | - | Jul 14, 12:05 UTC | Jul 14, 15:00 UTC | 2h 55m |
| 2026-07-13 | AXY873X | - | Jul 13, 10:00 UTC | Jul 13, 12:40 UTC | 2h 40m |
| 2026-07-12 | AXY182T | - | Jul 12, 13:25 UTC | Jul 12, 15:55 UTC | 2h 30m |
| 2026-07-11 | AXY374T | - | Jul 11, 09:40 UTC | Jul 11, 10:25 UTC | 45m |
| 2026-07-10 | AXY395F | ATH → RMI | Jul 10, 09:20 UTC | Jul 10, 11:15 UTC | 1h 55m |
| 2026-07-09 | AXY101N | - | Jul 9, 06:40 UTC | Jul 9, 07:55 UTC | 1h 15m |
| 2026-07-08 | AXY786T | VLC → FAO | Jul 8, 08:35 UTC | Jul 8, 09:45 UTC | 1h 10m |
| 2026-07-07 | AXY723V | LIN → ATH | Jul 7, 08:30 UTC | Jul 7, 10:25 UTC | 1h 55m |
| 2026-07-06 | AXY220M | - | Jul 6, 09:30 UTC | Jul 6, 10:50 UTC | 1h 20m |
| 2026-07-05 | AXY917R | - | Jul 5, 04:55 UTC | Jul 5, 08:25 UTC | 3h 30m |
| 2026-07-03 | AXY669F | - | Jul 3, 14:35 UTC | Jul 3, 15:30 UTC | 55m |
| 2026-07-03 | AXY913S | - | Jul 3, 07:40 UTC | Jul 3, 08:45 UTC | 1h 5m |
| 2026-07-01 | AXY341S | LPL → LBG | Jul 1, 19:20 UTC | Jul 1, 20:25 UTC | 1h 5m |
| 2026-07-01 | AXY875A | - | Jul 1, 16:30 UTC | Jul 1, 18:20 UTC | 1h 50m |
| 2026-06-30 | AXY925R | - | Jun 30, 10:55 UTC | Jun 30, 11:45 UTC | 50m |
| 2026-06-29 | AXY330M | AMS → FAB | Jun 29, 11:55 UTC | Jun 29, 12:49 UTC | 55m |
| 2026-06-29 | AXY754H | - | Jun 29, 06:40 UTC | Jun 29, 07:50 UTC | 1h 10m |
| 2026-06-28 | AXY313U | - | Jun 28, 11:45 UTC | Jun 28, 13:34 UTC | 1h 50m |
| 2026-06-26 | AXY546X | - | Jun 26, 15:29 UTC | Jun 26, 18:09 UTC | 2h 40m |
| 2026-06-25 | AXY360K | GRZ → SOF | Jun 25, 11:54 UTC | Jun 25, 13:09 UTC | 1h 15m |
| 2026-06-25 | AXY845X | - | Jun 25, 06:00 UTC | Jun 25, 08:09 UTC | 2h 10m |
| 2026-06-23 | AXY2355 | - | Jun 23, 16:29 UTC | Jun 23, 18:50 UTC | 2h 20m |
| 2026-06-22 | AXY339M | IBZ → NCE | Jun 22, 00:14 UTC | Jun 22, 01:25 UTC | 1h 10m |
| 2026-06-21 | AXY398H | - | Jun 21, 15:25 UTC | Jun 21, 16:59 UTC | 1h 35m |
| 2026-06-20 | AXY438F | - | Jun 20, 13:49 UTC | Jun 20, 14:19 UTC | 30m |
| 2026-06-19 | AXY915M | - | Jun 19, 15:49 UTC | Jun 19, 17:14 UTC | 1h 25m |
| 2026-06-19 | AXY135J | - | Jun 19, 13:14 UTC | Jun 19, 14:19 UTC | 1h 5m |
| 2026-06-18 | AXY459P | - | Jun 18, 20:25 UTC | Jun 18, 22:00 UTC | 1h 35m |
| 2026-06-18 | AXY244M | - | Jun 18, 14:01 UTC | Jun 18, 16:10 UTC | 2h 10m |
| 2026-06-16 | AXY594C | - | Jun 16, 19:10 UTC | Jun 16, 21:15 UTC | 2h 6m |
| 2026-06-15 | AXY997P | - | Jun 15, 21:04 UTC | Jun 15, 22:05 UTC | 1h 0m |
| 2026-06-15 | AXY197W | - | Jun 15, 17:59 UTC | Jun 15, 18:55 UTC | 55m |
| 2026-06-15 | AXY979N | - | Jun 15, 15:50 UTC | Jun 15, 16:24 UTC | 35m |
| 2026-06-15 | AXY979N | - | Jun 15, 14:55 UTC | Jun 15, 15:04 UTC | 10m |
| 2026-06-15 | AXY166M | - | Jun 15, 07:35 UTC | Jun 15, 10:05 UTC | 2h 30m |
| 2026-06-14 | AXY890E | - | Jun 14, 14:50 UTC | Jun 14, 15:35 UTC | 45m |
| 2026-06-13 | AXY202X | BRN → MAD | Jun 13, 13:50 UTC | Jun 13, 15:40 UTC | 1h 50m |
| 2026-06-13 | AXY339W | - | Jun 13, 07:40 UTC | Jun 13, 08:35 UTC | 55m |
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 9H-BOO page for operator, model, and routing details .