Apparatus

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sensors Mode-S transponder

4D21C8

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-TJC · BOEING 737-800

Hex
4D21C8
Octal
23220710
Decimal
5,054,920
Country
MT
Tail
9H-TJC
Type
B738
Broadcasting now · callsign CAI2W · 38,000 ft
Flights observed
269
Distinct callsigns
20
Country
MT
Last broadcast
16m ago

Current position

4D21C8 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21C8 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
CXI5RU - 13 2026-06-14
CXI6HN Shanxi Airlines 10 2026-07-14
CXI8DF - 9 2026-07-10
CXI67FR - 7 2026-07-12
SEJ682 - 6 2026-04-22
SEJ802 Spicejet 5 2026-04-20
SEJ681 Spicejet 5 2026-04-22
SEJ648 Spicejet 5 2026-04-22
CXI4C - 5 2026-06-28
SEJ876 Spicejet 4 2026-04-30
SEJ650 - 4 2026-04-30
SEJ647 Spicejet 4 2026-04-22
SEJ642 Spicejet 4 2026-04-28
CXI9N Shanxi Airlines 4 2026-07-04
CXI7PV Shanxi Airlines 4 2026-06-13
CXI6F - 4 2026-07-06
CXI4HL - 4 2026-07-06
CAI5D - 4 2026-07-13
CAI46NY - 4 2026-07-07
SEJ877 Spicejet 3 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAI1B - Jul 14, 19:25 UTCJul 15, 02:00 UTC6h 34m
2026-07-14 CXI6HN HRG → DUS Jul 14, 05:35 UTCJul 14, 16:15 UTC10h 40m
2026-07-13 CAI5D DUS → DUS Jul 13, 19:15 UTCJul 14, 04:05 UTC8h 50m
2026-07-13 CXI66AG LPA → DUS Jul 13, 11:30 UTCJul 13, 14:55 UTC3h 25m
2026-07-13 CXI5V - Jul 13, 05:25 UTCJul 13, 09:40 UTC4h 15m
2026-07-13 CXI702 - Jul 13, 01:30 UTCJul 13, 04:05 UTC2h 35m
2026-07-12 CXI701 - Jul 12, 19:05 UTCJul 12, 22:00 UTC2h 55m
2026-07-12 CXI67FR - Jul 12, 14:10 UTCJul 12, 17:35 UTC3h 25m
2026-07-12 CXI9YT - Jul 12, 12:05 UTCJul 12, 12:15 UTC10m
2026-07-12 CXI9YT - Jul 12, 08:15 UTCJul 12, 11:30 UTC3h 15m
2026-07-12 CAI51AE - Jul 12, 03:35 UTCJul 12, 06:40 UTC3h 5m
2026-07-11 CAI7KJ - Jul 11, 23:30 UTCJul 12, 02:01 UTC2h 30m
2026-07-11 CAI9MN - Jul 11, 19:05 UTCJul 11, 22:05 UTC3h 0m
2026-07-11 CAI14DA - Jul 11, 15:05 UTCJul 11, 17:45 UTC2h 40m
2026-07-11 CXI3CA RHO → DUS Jul 11, 10:35 UTCJul 11, 13:50 UTC3h 15m
2026-07-11 CXI9NM - Jul 11, 05:40 UTCJul 11, 08:40 UTC3h 0m
2026-07-11 CAI5D - Jul 11, 00:50 UTCJul 11, 04:10 UTC3h 20m
2026-07-10 CAI82KY - Jul 10, 19:15 UTCJul 10, 22:10 UTC2h 56m
2026-07-10 CXI8DF - Jul 10, 11:40 UTCJul 10, 14:50 UTC3h 10m
2026-07-10 CXI16QB - Jul 10, 07:15 UTCJul 10, 09:50 UTC2h 35m
2026-07-10 CAI5X - Jul 10, 02:40 UTCJul 10, 05:50 UTC3h 10m
2026-07-09 CAI7KJ - Jul 9, 22:55 UTCJul 10, 01:20 UTC2h 25m
2026-07-09 CAI9MN - Jul 9, 18:10 UTCJul 9, 21:15 UTC3h 5m
2026-07-09 CAI14DA - Jul 9, 14:05 UTCJul 9, 16:35 UTC2h 30m
2026-07-09 CAI73LK - Jul 9, 09:40 UTCJul 9, 12:45 UTC3h 5m
2026-07-09 CAI2CG - Jul 9, 05:40 UTCJul 9, 08:15 UTC2h 35m
2026-07-08 CAI5D - Jul 8, 19:30 UTCJul 9, 04:10 UTC8h 40m
2026-07-08 CXI8DF - Jul 8, 12:35 UTCJul 8, 15:50 UTC3h 15m
2026-07-08 CXI86KF - Jul 8, 08:15 UTCJul 8, 10:50 UTC2h 35m
2026-07-08 CAI75QM - Jul 8, 03:35 UTCJul 8, 06:50 UTC3h 15m
2026-07-07 CAI7KJ - Jul 7, 23:50 UTCJul 8, 02:15 UTC2h 25m
2026-07-07 CAI9MN - Jul 7, 19:15 UTCJul 7, 22:25 UTC3h 10m
2026-07-07 CAI14DA - Jul 7, 15:05 UTCJul 7, 17:30 UTC2h 25m
2026-07-07 CAI1BF AYT → DUS Jul 7, 10:05 UTCJul 7, 13:45 UTC3h 40m
2026-07-07 CAI46NY - Jul 7, 05:20 UTCJul 7, 08:25 UTC3h 5m
2026-07-07 CXI702 - Jul 7, 01:10 UTCJul 7, 04:05 UTC2h 55m
2026-07-06 CXI701 - Jul 6, 19:30 UTCJul 6, 22:10 UTC2h 40m
2026-07-06 CXI4HL - Jul 6, 16:05 UTCJul 6, 18:10 UTC2h 5m
2026-07-06 CXI6F - Jul 6, 13:10 UTCJul 6, 15:00 UTC1h 50m
2026-07-06 CAI5W DUS → DUS Jul 6, 04:45 UTCJul 6, 11:45 UTC7h 0m
2026-07-05 CXI4HL - Jul 5, 17:15 UTCJul 5, 19:30 UTC2h 15m
2026-07-05 CXI6F - Jul 5, 14:00 UTCJul 5, 15:50 UTC1h 50m
2026-07-05 CAI77BD AYT → DUS Jul 5, 08:55 UTCJul 5, 12:35 UTC3h 40m
2026-07-05 CAI46NY - Jul 5, 04:25 UTCJul 5, 07:20 UTC2h 55m
2026-07-04 CXI2CL CFU → DUS Jul 4, 17:30 UTCJul 4, 19:50 UTC2h 20m
2026-07-04 CXI9N KGS → CGN Jul 4, 13:55 UTCJul 4, 15:45 UTC1h 50m
2026-07-04 CAI9GH BRU → AYT Jul 4, 09:00 UTCJul 4, 12:55 UTC3h 55m
2026-07-04 CAI46NY - Jul 4, 04:30 UTCJul 4, 07:30 UTC3h 0m
2026-07-03 CXI4HL - Jul 3, 17:15 UTCJul 3, 19:15 UTC2h 0m
2026-07-03 CXI6F - Jul 3, 14:10 UTCJul 3, 16:00 UTC1h 50m

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

Mode-S 4D21C8 frequently asked

What is Mode-S code 4D21C8?
4D21C8 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-TJC.
Where is Mode-S 4D21C8 registered?
Mode-S code 4D21C8 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21C8 broadcasting right now?
Yes. Mode-S 4D21C8 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21C8, octal 23220710, decimal 5,054,920.
What flights does 4D21C8 operate?
Mode-S 4D21C8 has broadcast 20 distinct callsigns, including CXI5RU, CXI6HN, CXI8DF, CXI67FR, SEJ682.