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
No current signal · last broadcast 22h ago
Flights observed
98
Distinct callsigns
19
Country
MT
Last broadcast
22h ago

Last known position

Most recent position reported by Mode-S 4D23C4.

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

DateFlightRouteTakeoffLandingDuration
2026-05-28 GTR1986 - May 28, 21:15 UTCMay 29, 02:45 UTC5h 30m
2026-05-28 GTR1986 - May 28, 05:05 UTCMay 29, 02:45 UTC21h 40m
2026-05-28 GTR1986 - May 28, 03:35 UTCMay 29, 02:45 UTC23h 10m
2026-05-28 GTR1975 - May 28, 01:45 UTCMay 29, 01:00 UTC23h 15m
2026-05-27 GTR1975 - May 27, 15:00 UTCMay 28, 05:25 UTC14h 25m
2026-05-27 GTR1538 - May 27, 02:39 UTCMay 27, 12:10 UTC9h 30m
2026-05-26 GTR1926 - May 26, 15:09 UTCMay 26, 22:59 UTC7h 50m
2026-05-26 GTR1924 TBS → ZAZ May 26, 06:54 UTCMay 26, 11:44 UTC4h 50m
2026-05-25 GTR1924 - May 25, 22:10 UTCMay 26, 05:00 UTC6h 50m
2026-05-25 GTR1515 - May 25, 08:15 UTCMay 25, 19:59 UTC11h 44m
2026-05-24 GTR1604 TBS → DAC May 24, 23:25 UTCMay 25, 05:00 UTC5h 35m
2026-05-24 GTR1604 ZAZ → TBS May 24, 15:30 UTCMay 24, 20:40 UTC5h 10m
2026-05-24 GTR1560 YYZ → ZAZ May 24, 07:00 UTCMay 24, 11:55 UTC4h 55m
2026-05-23 GTR1560 YYZ → ZAZ May 23, 22:25 UTCMay 24, 05:05 UTC6h 40m
2026-05-23 GTR1566 DWC → ZAZ May 23, 06:55 UTCMay 23, 18:40 UTC11h 46m
2026-05-23 GTR1568 DWC → ZAZ May 23, 02:25 UTCMay 23, 04:25 UTC2h 0m
2026-05-22 GTR1956 ZAZ → DEL May 22, 15:15 UTCMay 23, 00:10 UTC8h 55m
2026-05-20 GTR1538 - May 20, 03:25 UTCMay 20, 12:30 UTC9h 6m
2026-05-19 GTR1926 - May 19, 14:55 UTCMay 19, 23:20 UTC8h 25m
2026-05-19 GTR1924 TBS → ZAZ May 19, 06:10 UTCMay 19, 11:10 UTC5h 0m
2026-05-18 GTR1924 - May 18, 21:30 UTCMay 19, 03:55 UTC6h 25m
2026-05-18 GTR1515 - May 18, 07:00 UTCMay 18, 19:25 UTC12h 24m
2026-05-17 GTR1604 - May 17, 20:35 UTCMay 18, 04:25 UTC7h 50m
2026-05-17 GTR1604 - May 17, 14:15 UTCMay 17, 17:01 UTC2h 45m
2026-05-17 GTR1560 YYZ → ZAZ May 17, 07:10 UTCMay 17, 12:25 UTC5h 15m
2026-05-16 GTR1560 YYZ → ZAZ May 16, 21:55 UTCMay 17, 04:20 UTC6h 25m
2026-05-16 GTR1566 DWC → ZAZ May 16, 07:05 UTCMay 16, 18:55 UTC11h 50m
2026-05-16 GTR1568 DWC → ZAZ May 16, 02:30 UTCMay 16, 04:20 UTC1h 50m
2026-05-15 GTR1956 - May 15, 15:10 UTCMay 15, 23:25 UTC8h 15m
2026-05-14 GTR1943 DEL → ZAZ May 14, 10:20 UTCMay 14, 19:45 UTC9h 25m
2026-05-14 GTR1932 ZAZ → DWC May 14, 03:25 UTCMay 14, 07:55 UTC4h 30m
2026-05-13 GTR1932 ZAZ → DWC May 13, 22:40 UTCMay 14, 00:55 UTC2h 15m
2026-05-13 GTR1932 ZAZ → DWC May 13, 16:50 UTCMay 13, 20:35 UTC3h 45m
2026-05-13 GTR1538 DEL → ZAZ May 13, 05:15 UTCMay 13, 14:55 UTC9h 40m
2026-05-12 GTR1926 ZAZ → DEL May 12, 17:35 UTCMay 13, 01:40 UTC8h 5m
2026-05-12 GTR1924 TBS → ZAZ May 12, 10:35 UTCMay 12, 16:00 UTC5h 25m
2026-05-11 GTR1924 - May 11, 13:05 UTCMay 12, 08:05 UTC19h 1m
2026-05-11 GTR1515 - May 11, 11:05 UTCMay 12, 08:05 UTC21h 1m
2026-05-11 GTR1604 - May 11, 03:00 UTCMay 11, 08:20 UTC5h 20m
2026-05-10 GTR1604 - May 10, 18:55 UTCMay 10, 21:35 UTC2h 40m
2026-05-10 GTR1560 YYZ → ZAZ May 10, 11:40 UTCMay 10, 17:10 UTC5h 30m
2026-05-10 GTR1560 YYZ → ZAZ May 10, 02:10 UTCMay 10, 08:54 UTC6h 45m
2026-05-09 GTR1566 DWC → ZAZ May 9, 11:25 UTCMay 10, 00:24 UTC13h 0m
2026-05-09 GTR1568 DWC → ZAZ May 9, 07:45 UTCMay 9, 09:40 UTC1h 55m
2026-05-08 GTR1956 ZAZ → DEL May 8, 15:10 UTCMay 9, 05:35 UTC14h 25m
2026-05-06 GTR1538 DEL → ZAZ May 6, 03:55 UTCMay 6, 13:30 UTC9h 35m
2026-05-05 GTR1926 ZAZ → DEL May 5, 15:10 UTCMay 5, 23:25 UTC8h 15m
2026-05-03 GTR1573 TBS → ZAZ May 3, 15:10 UTCMay 3, 20:15 UTC5h 5m
2026-05-03 GTR1573 - May 3, 06:30 UTCMay 3, 13:00 UTC6h 30m
2026-05-02 GTR1962 - May 2, 22:45 UTCMay 3, 04:30 UTC5h 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 .

Mode-S 4D23C4 frequently asked

What is Mode-S code 4D23C4?
4D23C4 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-VDC.
Where is Mode-S 4D23C4 registered?
Mode-S code 4D23C4 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D23C4 broadcasting right now?
No active broadcast right now. Last signal was 22h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D23C4, octal 23221704, decimal 5,055,428.
What flights does 4D23C4 operate?
Mode-S 4D23C4 has broadcast 19 distinct callsigns, including GTR1986, GTR1956, GTR1914, GTR1573, GTR1975.