sensors Mode-S transponder
4D21B4
ICAO 24-bit transponder address · allocated to Malta
Currently assigned to 9H-PGS · AIRBUS A-340-600
- Hex
- 4D21B4
- Octal
- 23220664
- Decimal
- 5,054,900
- Country
- MT
- Tail
- 9H-PGS
- Type
- A346
- Flights observed
- 37
- Distinct callsigns
- 20
- Country
- MT
- Last broadcast
- Jul 19, 15:05 UTC
Current position
Country allocation
The ICAO 24-bit address 4D21B4 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 |
|---|---|---|---|
| AJO174 | - | 3 | 2026-06-04 |
| AJO173 | - | 3 | 2026-06-01 |
| AJO931 | - | 2 | 2026-05-24 |
| AJO474 | - | 2 | 2026-07-11 |
| AJO447 | - | 2 | 2026-07-08 |
| AJO361 | - | 2 | 2026-07-18 |
| AJO300 | - | 2 | 2026-06-18 |
| AJO266 | - | 2 | 2026-06-16 |
| AJO997 | - | 1 | 2026-05-07 |
| AJO929 | - | 1 | 2026-05-19 |
| AJO928 | - | 1 | 2026-05-17 |
| AJO927 | - | 1 | 2026-05-12 |
| AJO926 | - | 1 | 2026-05-08 |
| AJO513 | - | 1 | 2026-07-18 |
| AJO468 | - | 1 | 2026-07-19 |
| AJO449 | - | 1 | 2026-07-10 |
| AJO448 | - | 1 | 2026-07-10 |
| AJO359 | - | 1 | 2026-07-16 |
| AJO358 | - | 1 | 2026-07-15 |
| AJO302 | - | 1 | 2026-07-05 |
Recent flights last 37
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-19 | AJO468 | FAO → FAB | Jul 19, 12:50 UTC | Jul 19, 15:05 UTC | 2h 15m |
| 2026-07-18 | AJO513 | - | Jul 18, 19:45 UTC | Jul 18, 22:05 UTC | 2h 20m |
| 2026-07-18 | AJO361 | - | Jul 18, 18:40 UTC | Jul 18, 19:10 UTC | 30m |
| 2026-07-18 | AJO361 | LPL → DUB | Jul 18, 09:35 UTC | Jul 18, 10:15 UTC | 40m |
| 2026-07-16 | AJO359 | DUB → LPL | Jul 16, 13:15 UTC | Jul 16, 13:40 UTC | 25m |
| 2026-07-15 | AJO358 | - | Jul 15, 13:05 UTC | Jul 15, 15:20 UTC | 2h 15m |
| 2026-07-11 | AJO474 | - | Jul 11, 11:35 UTC | Jul 11, 12:00 UTC | 25m |
| 2026-07-11 | AJO474 | - | Jul 11, 07:10 UTC | Jul 11, 07:50 UTC | 40m |
| 2026-07-10 | AJO449 | - | Jul 10, 17:05 UTC | Jul 10, 17:55 UTC | 50m |
| 2026-07-10 | AJO448 | - | Jul 10, 13:10 UTC | Jul 10, 14:05 UTC | 55m |
| 2026-07-08 | AJO447 | - | Jul 8, 12:30 UTC | Jul 8, 14:35 UTC | 2h 5m |
| 2026-07-08 | AJO447 | FAO → LBG | Jul 8, 08:50 UTC | Jul 8, 11:10 UTC | 2h 20m |
| 2026-07-05 | AJO302 | - | Jul 5, 09:25 UTC | Jul 5, 16:50 UTC | 7h 25m |
| 2026-07-02 | AJO301 | FAO → DWC | Jul 2, 18:25 UTC | Jul 3, 01:25 UTC | 7h 0m |
| 2026-06-24 | AJO196 | LPL → FAO | Jun 24, 16:29 UTC | Jun 24, 18:55 UTC | 2h 25m |
| 2026-06-20 | AJO267 | - | Jun 20, 17:24 UTC | Jun 20, 18:10 UTC | 45m |
| 2026-06-18 | AJO300 | - | Jun 18, 12:10 UTC | Jun 18, 16:05 UTC | 3h 55m |
| 2026-06-17 | AJO300 | - | Jun 17, 07:50 UTC | Jun 17, 11:45 UTC | 3h 55m |
| 2026-06-16 | AJO266 | - | Jun 16, 18:55 UTC | Jun 16, 19:40 UTC | 45m |
| 2026-06-16 | AJO266 | - | Jun 16, 17:35 UTC | Jun 16, 18:25 UTC | 50m |
| 2026-06-15 | AJO194 | - | Jun 15, 14:05 UTC | Jun 15, 14:55 UTC | 50m |
| 2026-06-15 | AJO193 | - | Jun 15, 10:20 UTC | Jun 15, 12:45 UTC | 2h 25m |
| 2026-06-14 | AJO264 | - | Jun 14, 14:55 UTC | Jun 14, 15:20 UTC | 25m |
| 2026-06-04 | AJO174 | FAO → CAT | Jun 4, 18:50 UTC | Jun 4, 19:20 UTC | 30m |
| 2026-06-04 | AJO174 | - | Jun 4, 14:20 UTC | Jun 4, 17:05 UTC | 2h 45m |
| 2026-06-04 | AJO174 | - | Jun 4, 08:35 UTC | Jun 4, 09:40 UTC | 1h 5m |
| 2026-06-01 | AJO173 | - | Jun 1, 16:25 UTC | Jun 1, 18:10 UTC | 1h 45m |
| 2026-06-01 | AJO173 | - | Jun 1, 10:50 UTC | Jun 1, 11:30 UTC | 40m |
| 2026-06-01 | AJO173 | FAO → LUX | Jun 1, 05:30 UTC | Jun 1, 07:50 UTC | 2h 20m |
| 2026-05-31 | AJO171 | CAT → FAO | May 31, 16:40 UTC | May 31, 17:15 UTC | 35m |
| 2026-05-24 | AJO931 | FAO → CAT | May 24, 13:20 UTC | May 24, 13:50 UTC | 30m |
| 2026-05-24 | AJO931 | INN → FAO | May 24, 09:45 UTC | May 24, 12:15 UTC | 2h 30m |
| 2026-05-19 | AJO929 | - | May 19, 10:35 UTC | May 19, 11:55 UTC | 1h 20m |
| 2026-05-17 | AJO928 | FAO → LTN | May 17, 08:35 UTC | May 17, 11:01 UTC | 2h 25m |
| 2026-05-12 | AJO927 | CEG → FAO | May 12, 09:15 UTC | May 12, 11:35 UTC | 2h 20m |
| 2026-05-08 | AJO926 | FAO → CEG | May 8, 10:04 UTC | May 8, 12:20 UTC | 2h 15m |
| 2026-05-07 | AJO997 | AMS → FAO | May 7, 17:50 UTC | May 7, 20:25 UTC | 2h 35m |
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-PGS page for operator, model, and routing details .