Apparatus

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sensors Mode-S transponder

4D2124

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-GTC · BOEING 737-400

Hex
4D2124
Octal
23220444
Decimal
5,054,756
Country
MT
Tail
9H-GTC
Type
B734
No current signal · last broadcast 2d ago
Flights observed
163
Distinct callsigns
20
Country
MT
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 4D2124.

Country allocation

The ICAO 24-bit address 4D2124 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
HAT5020 Air Taxi 14 2026-07-07
HAT5010 - 9 2026-07-06
HAT5013 Air Taxi 7 2026-07-06
HAT5062 - 6 2026-07-11
HAT5012 - 6 2026-07-06
HAT5072 - 5 2026-07-05
HAT5060 - 5 2026-07-11
HAT5053 - 5 2026-07-10
HAT5011 - 5 2026-07-06
HAT5070 - 4 2026-07-05
HAT5052 - 4 2026-07-10
HAT5769 - 3 2026-04-17
HAT5071 - 3 2026-07-05
HAT5063 - 3 2026-07-11
HAT5061 - 3 2026-07-11
HAT688P - 2 2026-04-17
HAT6702 - 2 2026-04-14
HAT6688 - 2 2026-04-17
HAT576P - 2 2026-04-14
HAT5768 - 2 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 HAT5063 - Jul 11, 17:25 UTCJul 11, 18:50 UTC1h 25m
2026-07-11 HAT5062 - Jul 11, 14:40 UTCJul 11, 16:10 UTC1h 30m
2026-07-11 HAT5061 - Jul 11, 10:55 UTCJul 11, 13:10 UTC2h 15m
2026-07-11 HAT5060 OPO → OLB Jul 11, 07:30 UTCJul 11, 10:10 UTC2h 40m
2026-07-10 HAT5053 - Jul 10, 19:00 UTCJul 10, 20:30 UTC1h 30m
2026-07-10 HAT5052 - Jul 10, 13:55 UTCJul 10, 15:30 UTC1h 35m
2026-07-10 HAT569P - Jul 10, 10:30 UTCJul 10, 12:20 UTC1h 50m
2026-07-09 HAT6569 - Jul 9, 21:30 UTCJul 9, 23:10 UTC1h 40m
2026-07-09 HAT6568 - Jul 9, 06:25 UTCJul 9, 08:00 UTC1h 35m
2026-07-08 HAT656P OPO → CDG Jul 8, 12:40 UTCJul 8, 14:30 UTC1h 50m
2026-07-07 HAT5020 OPO → PMI Jul 7, 14:10 UTCJul 7, 17:15 UTC3h 5m
2026-07-07 HAT5020 OPO → PMI Jul 7, 12:20 UTCJul 7, 12:45 UTC25m
2026-07-07 HAT5020 OPO → PMI Jul 7, 06:20 UTCJul 7, 09:35 UTC3h 15m
2026-07-06 HAT5013 DJE → OPO Jul 6, 17:15 UTCJul 6, 19:55 UTC2h 40m
2026-07-06 HAT5012 - Jul 6, 13:10 UTCJul 6, 14:45 UTC1h 35m
2026-07-06 HAT5011 - Jul 6, 10:45 UTCJul 6, 11:35 UTC50m
2026-07-06 HAT5010 - Jul 6, 08:50 UTCJul 6, 09:00 UTC10m
2026-07-06 HAT5010 - Jul 6, 07:20 UTCJul 6, 08:15 UTC55m
2026-07-05 HAT5072 OPO → OPO Jul 5, 13:05 UTCJul 5, 17:35 UTC4h 30m
2026-07-05 HAT5071 - Jul 5, 09:55 UTCJul 5, 11:30 UTC1h 35m
2026-07-05 HAT5070 OPO → PXO Jul 5, 07:15 UTCJul 5, 08:55 UTC1h 40m
2026-07-04 HAT5063 - Jul 4, 17:20 UTCJul 4, 18:45 UTC1h 25m
2026-07-04 HAT5062 - Jul 4, 14:50 UTCJul 4, 16:15 UTC1h 25m
2026-07-04 HAT5061 - Jul 4, 11:20 UTCJul 4, 13:30 UTC2h 10m
2026-07-04 HAT5060 - Jul 4, 07:15 UTCJul 4, 09:20 UTC2h 5m
2026-07-03 HAT5053 OPO → OPO Jul 3, 15:15 UTCJul 3, 21:15 UTC6h 0m
2026-06-30 HAT5020 OPO → PMI Jun 30, 17:35 UTCJun 30, 20:50 UTC3h 15m
2026-06-30 HAT5020 OPO → PMI Jun 30, 13:55 UTCJun 30, 14:10 UTC15m
2026-06-30 HAT5020 OPO → PMI Jun 30, 09:40 UTCJun 30, 12:45 UTC3h 5m
2026-06-29 HAT5013 DJE → OPO Jun 29, 17:59 UTCJun 29, 20:35 UTC2h 35m
2026-06-29 HAT5012 - Jun 29, 13:19 UTCJun 29, 15:00 UTC1h 40m
2026-06-29 HAT5011 - Jun 29, 10:10 UTCJun 29, 11:50 UTC1h 40m
2026-06-29 HAT5010 - Jun 29, 07:25 UTCJun 29, 09:00 UTC1h 35m
2026-06-28 HAT5073 - Jun 28, 16:05 UTCJun 28, 17:50 UTC1h 45m
2026-06-28 HAT5072 - Jun 28, 13:00 UTCJun 28, 14:34 UTC1h 35m
2026-06-28 HAT5071 - Jun 28, 10:10 UTCJun 28, 11:45 UTC1h 35m
2026-06-28 HAT5070 - Jun 28, 07:44 UTCJun 28, 09:20 UTC1h 35m
2026-06-27 HAT5062 - Jun 27, 16:59 UTCJun 27, 18:20 UTC1h 20m
2026-06-27 HAT5062 - Jun 27, 14:14 UTCJun 27, 15:39 UTC1h 25m
2026-06-27 HAT5061 OLB → OPO Jun 27, 10:05 UTCJun 27, 12:25 UTC2h 20m
2026-06-27 HAT5060 - Jun 27, 06:50 UTCJun 27, 08:55 UTC2h 5m
2026-06-26 HAT5053 - Jun 26, 20:29 UTCJun 26, 23:00 UTC2h 30m
2026-06-26 HAT5052 - Jun 26, 16:39 UTCJun 26, 18:29 UTC1h 50m
2026-06-26 HAT565P - Jun 26, 13:30 UTCJun 26, 15:39 UTC2h 10m
2026-06-26 HAT6565 - Jun 26, 07:39 UTCJun 26, 09:35 UTC1h 55m
2026-06-23 HAT5020 OPO → PMI Jun 23, 16:24 UTCJun 23, 19:34 UTC3h 10m
2026-06-23 HAT5020 OPO → PMI Jun 23, 14:10 UTCJun 23, 14:39 UTC30m
2026-06-23 HAT5020 OPO → PMI Jun 23, 09:49 UTCJun 23, 13:05 UTC3h 15m
2026-06-22 HAT5013 DJE → OPO Jun 22, 18:44 UTCJun 22, 20:39 UTC1h 55m
2026-06-22 HAT5013 DJE → OPO Jun 22, 17:55 UTCJun 22, 18:04 UTC10m

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-GTC page for operator, model, and routing details .

Mode-S 4D2124 frequently asked

What is Mode-S code 4D2124?
4D2124 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-GTC.
Where is Mode-S 4D2124 registered?
Mode-S code 4D2124 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2124 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2124, octal 23220444, decimal 5,054,756.
What flights does 4D2124 operate?
Mode-S 4D2124 has broadcast 20 distinct callsigns, including HAT5020, HAT5010, HAT5013, HAT5062, HAT5012.