sensors Mode-S transponder
4D23C4
ICAO 24-bit transponder address · allocated to Malta
Currently assigned to 9H-VDC · AIRBUS A-330-300
- Hex
- 4D23C4
- Octal
- 23221704
- Decimal
- 5,055,428
- Country
- MT
- Tail
- 9H-VDC
- Type
- A333
- Flights observed
- 98
- Distinct callsigns
- 19
- Country
- MT
- Last broadcast
- 22h ago
Last known position
Country allocation
The ICAO 24-bit address 4D23C4 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| GTR1986 | - | 10 | 2026-05-28 |
| GTR1956 | - | 8 | 2026-05-22 |
| GTR1914 | - | 8 | 2026-05-02 |
| GTR1573 | - | 8 | 2026-05-03 |
| GTR1975 | - | 7 | 2026-05-28 |
| GTR1604 | - | 7 | 2026-05-24 |
| GTR1568 | Gestar | 7 | 2026-05-23 |
| GTR1924 | - | 6 | 2026-05-26 |
| GTR1560 | Gestar | 6 | 2026-05-24 |
| GTR1515 | - | 6 | 2026-05-25 |
| GTR1926 | - | 5 | 2026-05-26 |
| GTR1538 | - | 5 | 2026-05-27 |
| GTR1962 | - | 4 | 2026-05-02 |
| GTR1932 | Gestar | 3 | 2026-05-14 |
| GTR1566 | Gestar | 3 | 2026-05-23 |
| GTR1945 | - | 2 | 2026-04-29 |
| GTR1946 | - | 1 | 2026-04-30 |
| GTR1943 | - | 1 | 2026-05-14 |
| GTR1557 | - | 1 | 2026-05-01 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-28 | GTR1986 | - | May 28, 21:15 UTC | May 29, 02:45 UTC | 5h 30m |
| 2026-05-28 | GTR1986 | - | May 28, 05:05 UTC | May 29, 02:45 UTC | 21h 40m |
| 2026-05-28 | GTR1986 | - | May 28, 03:35 UTC | May 29, 02:45 UTC | 23h 10m |
| 2026-05-28 | GTR1975 | - | May 28, 01:45 UTC | May 29, 01:00 UTC | 23h 15m |
| 2026-05-27 | GTR1975 | - | May 27, 15:00 UTC | May 28, 05:25 UTC | 14h 25m |
| 2026-05-27 | GTR1538 | - | May 27, 02:39 UTC | May 27, 12:10 UTC | 9h 30m |
| 2026-05-26 | GTR1926 | - | May 26, 15:09 UTC | May 26, 22:59 UTC | 7h 50m |
| 2026-05-26 | GTR1924 | TBS → ZAZ | May 26, 06:54 UTC | May 26, 11:44 UTC | 4h 50m |
| 2026-05-25 | GTR1924 | - | May 25, 22:10 UTC | May 26, 05:00 UTC | 6h 50m |
| 2026-05-25 | GTR1515 | - | May 25, 08:15 UTC | May 25, 19:59 UTC | 11h 44m |
| 2026-05-24 | GTR1604 | TBS → DAC | May 24, 23:25 UTC | May 25, 05:00 UTC | 5h 35m |
| 2026-05-24 | GTR1604 | ZAZ → TBS | May 24, 15:30 UTC | May 24, 20:40 UTC | 5h 10m |
| 2026-05-24 | GTR1560 | YYZ → ZAZ | May 24, 07:00 UTC | May 24, 11:55 UTC | 4h 55m |
| 2026-05-23 | GTR1560 | YYZ → ZAZ | May 23, 22:25 UTC | May 24, 05:05 UTC | 6h 40m |
| 2026-05-23 | GTR1566 | DWC → ZAZ | May 23, 06:55 UTC | May 23, 18:40 UTC | 11h 46m |
| 2026-05-23 | GTR1568 | DWC → ZAZ | May 23, 02:25 UTC | May 23, 04:25 UTC | 2h 0m |
| 2026-05-22 | GTR1956 | ZAZ → DEL | May 22, 15:15 UTC | May 23, 00:10 UTC | 8h 55m |
| 2026-05-20 | GTR1538 | - | May 20, 03:25 UTC | May 20, 12:30 UTC | 9h 6m |
| 2026-05-19 | GTR1926 | - | May 19, 14:55 UTC | May 19, 23:20 UTC | 8h 25m |
| 2026-05-19 | GTR1924 | TBS → ZAZ | May 19, 06:10 UTC | May 19, 11:10 UTC | 5h 0m |
| 2026-05-18 | GTR1924 | - | May 18, 21:30 UTC | May 19, 03:55 UTC | 6h 25m |
| 2026-05-18 | GTR1515 | - | May 18, 07:00 UTC | May 18, 19:25 UTC | 12h 24m |
| 2026-05-17 | GTR1604 | - | May 17, 20:35 UTC | May 18, 04:25 UTC | 7h 50m |
| 2026-05-17 | GTR1604 | - | May 17, 14:15 UTC | May 17, 17:01 UTC | 2h 45m |
| 2026-05-17 | GTR1560 | YYZ → ZAZ | May 17, 07:10 UTC | May 17, 12:25 UTC | 5h 15m |
| 2026-05-16 | GTR1560 | YYZ → ZAZ | May 16, 21:55 UTC | May 17, 04:20 UTC | 6h 25m |
| 2026-05-16 | GTR1566 | DWC → ZAZ | May 16, 07:05 UTC | May 16, 18:55 UTC | 11h 50m |
| 2026-05-16 | GTR1568 | DWC → ZAZ | May 16, 02:30 UTC | May 16, 04:20 UTC | 1h 50m |
| 2026-05-15 | GTR1956 | - | May 15, 15:10 UTC | May 15, 23:25 UTC | 8h 15m |
| 2026-05-14 | GTR1943 | DEL → ZAZ | May 14, 10:20 UTC | May 14, 19:45 UTC | 9h 25m |
| 2026-05-14 | GTR1932 | ZAZ → DWC | May 14, 03:25 UTC | May 14, 07:55 UTC | 4h 30m |
| 2026-05-13 | GTR1932 | ZAZ → DWC | May 13, 22:40 UTC | May 14, 00:55 UTC | 2h 15m |
| 2026-05-13 | GTR1932 | ZAZ → DWC | May 13, 16:50 UTC | May 13, 20:35 UTC | 3h 45m |
| 2026-05-13 | GTR1538 | DEL → ZAZ | May 13, 05:15 UTC | May 13, 14:55 UTC | 9h 40m |
| 2026-05-12 | GTR1926 | ZAZ → DEL | May 12, 17:35 UTC | May 13, 01:40 UTC | 8h 5m |
| 2026-05-12 | GTR1924 | TBS → ZAZ | May 12, 10:35 UTC | May 12, 16:00 UTC | 5h 25m |
| 2026-05-11 | GTR1924 | - | May 11, 13:05 UTC | May 12, 08:05 UTC | 19h 1m |
| 2026-05-11 | GTR1515 | - | May 11, 11:05 UTC | May 12, 08:05 UTC | 21h 1m |
| 2026-05-11 | GTR1604 | - | May 11, 03:00 UTC | May 11, 08:20 UTC | 5h 20m |
| 2026-05-10 | GTR1604 | - | May 10, 18:55 UTC | May 10, 21:35 UTC | 2h 40m |
| 2026-05-10 | GTR1560 | YYZ → ZAZ | May 10, 11:40 UTC | May 10, 17:10 UTC | 5h 30m |
| 2026-05-10 | GTR1560 | YYZ → ZAZ | May 10, 02:10 UTC | May 10, 08:54 UTC | 6h 45m |
| 2026-05-09 | GTR1566 | DWC → ZAZ | May 9, 11:25 UTC | May 10, 00:24 UTC | 13h 0m |
| 2026-05-09 | GTR1568 | DWC → ZAZ | May 9, 07:45 UTC | May 9, 09:40 UTC | 1h 55m |
| 2026-05-08 | GTR1956 | ZAZ → DEL | May 8, 15:10 UTC | May 9, 05:35 UTC | 14h 25m |
| 2026-05-06 | GTR1538 | DEL → ZAZ | May 6, 03:55 UTC | May 6, 13:30 UTC | 9h 35m |
| 2026-05-05 | GTR1926 | ZAZ → DEL | May 5, 15:10 UTC | May 5, 23:25 UTC | 8h 15m |
| 2026-05-03 | GTR1573 | TBS → ZAZ | May 3, 15:10 UTC | May 3, 20:15 UTC | 5h 5m |
| 2026-05-03 | GTR1573 | - | May 3, 06:30 UTC | May 3, 13:00 UTC | 6h 30m |
| 2026-05-02 | GTR1962 | - | May 2, 22:45 UTC | May 3, 04:30 UTC | 5h 44m |
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-VDC page for operator, model, and routing details .